This CE Center article is no longer eligible for receiving credits.
            
            
                Hygiene 
         The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. When properly cleaned and maintained, stainless steel surfaces resist growth of bacteria, mold and microorganisms that can cause disease. Surface finishes on stainless steel reduce bacterial attachment and early biofilm formation. The easy cleaning ability of stainless makes it the first choice for strict hygiene conditions, such as hospitals, clinics, schools, public restrooms, commercial kitchens and food processing. 
Several studies have documented its superior cleanability when new and used compared with other sink materials.
Stainless steels, mainly Type 304, have largely replaced traditional sink materials, such as vitreous china and solid surface materials, as stainless steel sinks can be kept scrupulously clean and withstand aggressive chemicals.  
Stainless steel thrives with frequent cleaning, and, unlike some other materials, it is impossible to “wear out” stainless steel by excessive cleaning. The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. 
Electron micrograph images of surface bacterial contamination before and  after cleaning sink materials.
Source: Sinks  of Stainless Clean Best, Beat Bacteria by Dr. John T. Holah, 1990, Nickel  Development Institute Publication 14008
         
	
         
 
         Strength to Weight Advantage 
         As  anyone who has hefted a chipped and rust-stained farmhouse sink to the town  disposal center will testify, some sinks not only lack durability, they are  also extremely heavy, which adds to freight and installation labor costs. While  epoxy resins and polymers are certainly lighter than stone and cast iron, they  do not compete in terms of weight with stainless steel, which is the lightest  and easiest sink material to ship. Moreover, as one manufacturer reports, the  freight damage rate is very low. 
          The work-hardening property of austenitic  grades results in a significant strengthening of the material. At room  temperature Type 304 and Type 316 have nominal yield strengths of 42000 psi and  nominal tensile strengths or ductility of 84000 psi. Such high strengths permit  reduced material thickness and therefore savings in costs. In contrast,  aluminum alloy (3003-H14) is less than a third and copper nearly one half that  of Types 304 and 316 in tensile strength. 
         Manufacturing Automation
         Modern  steel-making techniques mean that stainless steel can be cut, welded, formed,  machined, and fabricated as readily as traditional steels. The advantage of  using Types 304 and 316 with their nickel content for sink manufacturing is  that products, such as multiple sink units, can be die-drawn or pressed from a  single flat piece of steel, thus avoiding any seams.
            
High-speed laser cutting stainless steel
Photo: Just Manufacturing
   
			Maintenance and Staining 
         Stainless  steel sinks do not stain and can be easily wiped down and cleaned with a soap or mild detergent  solution and do not require toxic cleaning chemicals. Some manufacturers supply  cleaning kits for sinks with higher-end finishes, which may be more difficult  to maintain. Easy maintenance makes stainless steel sinks especially appealing  across all applications, especially schools and health-care facilities. 
Staining 
  Solid Surface: Over time scale build up and microscopic debris can adhere to the surface thus creating stains that can give an unsightly appearance and unsanitary environment. Also, due to microscopic porosity associated with sold surface materials staining is quote common. This could be caused by a multitude of liquids used in healthcare environments. Stainless steel withstands the full range of healthcare environment chemicals and the range of liquids used in healthcare exam and patient room environments. 
     
Follow a few simple steps and your stainless steel products will retain their original beauty for many years to come.
Photo: Just Manufacturing
   
	  
         Long Term Value 
         The durability of stainless steel has a cost-effective impact from a life-cycle perspective. Stainless steel requires only minimal maintenance, which is both economical and good for the environment and society. The combination of corrosion resistance and durability increases product lifetimes. When the total life cycle costs are considered, stainless is often the least expensive material option due to durability and low maintenance. 
Stainless steel sinks last 15 to 25 years and are most often replaced because of interior renovations or upgrades rather than degradation of the sink itself.
In certain cases, these cost savings can be in the range of 30 percent to 40 percent compared to alternative materials, and due to reduced repair and maintenance costs. 
Given the additional sustainability features of stainless steel, there is clearly long term value in specifying stainless steel sinks. 
 
         Sustainability
         Stainless steel is one of the most sustainable material choices available—more than paper or glass.  
Stainless steel is 100 percent recyclable. It is estimated that about 90 percent of stainless steels are recycled at the end of their life to produce more stainless steels and this process can be carried on indefinitely.
This means resources are saved and the same material is continuously cycled through the production chain in a sustainable closed-loop system, rendering it an eco-friendly material. 
Stainless steel products complete their service life
Image courtesy of SSINA
   
Ultimately, the most environmentally friendly materials are  corrosion-resistant, durable, produce no surface offgassing, include high recycled content and recapture rates,  reduce resource use and provide long service life. Stainless steel provides all  of these benefits. 
        
         With the growing demand for green  construction and expanding military, federal and state requirements for U.S. Green Building Council  (USGBC)  LEED® (Leadership in Energy & Environmental Design)  certifications, design professionals increasingly need to be familiar with sustainability  factors of all specified products.  
         While a single stainless steel sink would make a  negligible contribution to LEED calculations, several hundred sinks in a new  institution could make a worthwhile contribution in at least two categories in  the LEED 2009 for New Construction and Major Renovations:
         
           Recycled Content 
           Materials & Resources (MR)  Credit 4: Recycled Content offers 1-2 points. 
           Requirements: Use  materials with recycled content such that the sum of postconsumer recycled  content plus 1/2 of the preconsumer content  constitutes at least 10% or 20%, based on cost, of the total value of the  materials in the project. 
           The recycled content value of a material assembly is determined by  weight. 
           
         Unlike  other sink materials, stainless steel is easily recycled and recaptured. North America’s number one recycled material is steel. Each year,  more steel is recycled than aluminum, paper, glass and plastic combined.  Stainless steel is 100 percent recyclable into the same product with no  reduction in quality. The metal’s high scrap value and  recyclability ensures that it is diverted from landfills and recaptured for use  in new stainless steel. A recent international study by Yale  University’s Center for Industrial  Ecology, and National Institute for Environmental Studies, Tsukuba, Japan,  determined that about 92% of the  stainless steel used in building applications worldwide is recaptured and  recycled at the end of service. 
          In North America, stainless steel producing members of the  SSINA have indicated that the average  recycled content of the 300 series stainless steel grades that are used in the  construction market is approximately 90 percent. Certificates of  origin are provided for every coil of stainless steel delivered to fabricators.  Stainless steel producers also regularly provide sustainability statements. The  supplier for one large domestic sink producer states that the average recycled  content is greater than 90 percent and that all scrap is procured from sources  in North America. It goes on to report that  approximately 85 percent of the scrap was post consumer scrap with the  remaining 15 percent being post-industrial and home scrap. Post consumer scrap is  defined by LEED as waste material generated by households or by  commercial, industrial and institutional facilities in their role as end-users  of the product, which can no longer be used for its intended purposes. 
         
           Regional  Materials 
           MR Credit 5: Regional Materials, 1–2  Points
           Requirements: Use  building materials or products that have been extracted, harvested or  recovered, as well as manufactured, within 500 miles of the project site for a minimum of 10% or 20%,  based on cost, of the total materials value.
           
          LEED has ruled that the point of origin for  steel is the producing melt shop—regardless of where the scrap comes from. If  the sink manufacturing facility and producer are within 500 miles of the  project site, the products are eligible for LEED regional credit. 
         LEED Recertification 
         As LEED consultants are pointing out, initial  certification is not the end of the story. Recertification is required for all buildings  certified under a LEED Existing Building Rating System. All applications for  Operations & Maintenance Recertification must occur no sooner than one year  and no later than five years following initial certification. Catherine  Houska, a  leading international expert on the use of stainless steel in architecture,  reports that owners and building managers are increasingly  aware of LEED recertification requirements. “Environmentally safe cleaning products should be used  for building maintenance. Since there is no reason to use toxic chemicals on  stainless steel, the choice of stainless steel sinks, however small, can  indirectly contribute to recertification points.”
             
            
                The  sink has long been an indispensable feature of kitchens around the world. In  earlier times they were constructed from vitreous china, enameled cast iron and  local materials such as Italian travertine, Vermont soapstone, or glazed red clay from  the English Midlands. Today, such choices still exist and, with the addition of  polymers and epoxy resins, a multitude of sink materials are on the market. But  there is one sink material that offers significant advantages over the  others—stainless steel. 
          Stainless steel sinks are not only produced from one of the most environmentally friendly metals commonly used  in construction, they provide many benefits such as corrosion resistance, fire  and heat resistance, hygiene, strength to weight advantage, ease of  fabrication, impact resistance, antibacterial value, and long-term value. 
 Unlike solid surface materials, stainless steel does not chip, stain, scratch or hold odors. It does not break down when exposed to thermal extremes and is not vulnerable to the porosity issues common to solid surfaces. Stainless surfaces are inherently antimicrobial compared to solid surface materials. The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. When properly cleaned and maintained, stainless steel surfaces resist growth of bacteria, mold and microorganisms that can cause disease.
 They have documented sustainability features, can meet  ADA  requirements and have applications for virtually all building types.  Moreover, with informed specification they offer a choice of design aesthetics  and enhanced functioning. It is not surprising that stainless steel in the manufacture of sinks is one of the largest use applications of stainless steel.
         What is  Stainless Steel? 
 From the documented hygienic and corrosion-resistant features, to the virtually unparalleled sustainability, stainless steel offers numerous advantages for design professionals. 
Photo: Just Manufacturing
 
 Stainless steel's resistance to corrosion and staining, low maintenance, low cost relative to other materials and familiar luster make it an ideal material for a host of commercial applications. 
         Used for many industrial, architectural, chemical  and consumer applications for over half a century, stainless steel is essentially a low-carbon steel, which contains chromium at 10.5 percent or more by weight. It is this  addition of chromium that gives the steel its unique stainless,  corrosion-resisting and enhanced mechanical properties.
        
Photo: Just Manufacturing
 
  The chromium content of the steel allows the formation of an adherent,  invisible, corrosion-resisting chromium oxide film on the steel surface. If  damaged mechanically or chemically, this film is self-healing, providing that  oxygen, even in very small amounts, is present. The corrosion resistance and  other useful properties of the steel are enhanced by increased chromium content  and the addition of other elements such as molybdenum, nickel, and nitrogen.  The addition of nickel changes and stabilizes the crystal structure of the  steel at room temperature and below, making it more formable, weldable and  tough. Nickel also gives stainless steel a lustrous and brighter appearance  which is less gray than steel that has no nickel.
      
  
Photo: Just Manufacturing
 
         There are well over 100 stainless steel alloys  and more than 60 grades of stainless steel. The latter can be divided into five  classes. Each is identified by the alloying elements which affect their  microstructure and for which each is named. The class from which most stainless  steel sinks are manufactured is austenitic. The other classes are: ferritic,  precipitation-hardening, martensitic, and duplex. Ferritic stainless steel  contains approximately 12 percent chromium and virtually no nickel. Since  nickel is an expensive alloy, sinks made from ferritic steel are less costly,  more brittle at lower temperatures and more gray in color. 
          Austenitic stainless steels, like all other stainless steels  containing chromium and nickel, are identified by the American Iron and Steel  Institute (AISI) as 300 Series types. The stainless steels in this group have  different compositions and properties, but many common characteristics. They  can be hardened by cold working, but not by heat treatment. In the annealed  (freed from internal stress by heating and gradual cooling) condition all are  essentially nonmagnetic. They have excellent corrosion resistance, unusually  good formability, and increased strength as a result of cold work.
         
          Type 304 is the basic chromium-nickel  austenitic stainless steel and has been found  suitable for the widest range of applications  in all kinds of products and architectural work.  As part of the 300 Series designation it is composed basically of 18 percent  chromium and 8 percent nickel and is sometimes referred to as 18-8 stainless.  It is nonmagnetic and cannot be hardened by heat treatment. It is readily  available in a variety of forms. This  type is easy to form and fabricate with  excellent resistance to corrosion. 
         Type 316 is the next most commonly  used stainless steel  for general corrosion resistance. It  consists of 16 percent chromium and 10 percent nickel, but offers more corrosion  resistance through the addition of 2-3 percent  molybdenum. 
       
Millimeters per year (mmpy)
Source: Specialty Steel Industry of North America
 
          
         Corrosion Resistance
           All stainless steels have a resistance to corrosion. Some grades resist better than others. Corrosion resistance is the primary reason for specifying stainless steel. The Specialty Steel Industry of North America (SSINA), a voluntary trade  association representing virtually all the producers of specialty steel in  North America (www.ssina.com), estimates that one-third of the cost of  corrosion of metals in the U.S. (some $100 billion) can be avoided by the use  of best known technology that begins with the selection of noncorrosive  materials such as stainless steel. It is essential, however, for the design  professional to know the nature of the environment and the degree of corrosion  or heat resistance required since many variables characterize  a corrosive environment—chemicals  and their concentration, atmospheric conditions,  temperature and time. Severe corrosion may cause pitting that occurs when the  protective film breaks down in small isolated spots. Once started, the attack  may accelerate because of differences in electric potential between the large  areas of passive surface versus the active pit. 
         
 Generally  speaking, lower-alloyed  grades of stainless steel resist corrosion in atmospheric and pure water  environments, while higher-alloyed grades can resist corrosion in most acids,  alkaline solutions, and chlorine-bearing environments.
          Type 304  stainless steel is used extensively in health-care environments  and in food processing environments (except possibly  for high-temperature conditions  involving high acid and chloride contents). It resists organic chemicals, dyestuffs, and a wide variety of inorganic  chemicals. Type 304 L (low carbon) stainless  steel resists nitric acid well and sulfuric acids  at moderate temperature and concentrations. 
          Type 316 stainless steel with  its increased nickel content and addition of molybdenum is  desirable where severe corrosion conditions exist and pitting is to be avoided  such as in chloride environments. 
          Type 304  stainless steel is standard for leading sink manufacturers. Type 316 is  available on request for most models. 
 
          Corrosion  resistance data and standard corrosion references are available from the SSINA’s Design Guidelines for the Selection and Use of Stainless Steel. The  Guidelines also contain a useful table listing where different grades of  stainless steel are used for particular environments such as soaps and  pharmaceuticals. 
          As an aid  to design professionals, leading sink manufacturers also offer stainless steel  laboratory corrosion data for resistance of stainless steels to chemical media  at certain temperatures. Rates of corrosion are expressed in terms of depth of  pitting per year. 
         
           
             | 1. Fully resistant | 
             0.002-in | 
           
           
             | 2. Satisfactorily  resistant | 
             0.010-in | 
           
           
             | 3. Fairly resistant | 
             0.020-in | 
           
           
             | 4. Slightly resistant | 
             0.040-in/0.050-in | 
           
           
             | 5. Not resistant | 
             0.050-in and over | 
           
         
          
         
         Examples of data are: 
         
           - Hydrochloric acid, all concentrations (diluted  bleach becomes corrosive hydrochloric acid), 70 degrees F., Type 304 and Type  316 rated 5 (not resistant)
 
           - Sulphuric acid 5 percent, 70 degrees F. Type 304  rated 3 (fairly resistant); Type 316 rated 2 (satisfactorily resistant)
 
         
         Stainless steel sink manufacturers point out  that the suitability of stainless steels in various corrosive environments is  based on a long history of successful applications. However, since small  differences in chemical content and temperature can affect corrosion rates,  they suggest service tests under the worst operating conditions anticipated in  order to determine which optimum materials to specify and suggest ASTM G4 -  01(2008) Standard Guide for Conducting  Corrosion Tests in Field Applications as a recommended practice. 
 The many unique values provided by stainless steel make it a powerful candidate in materials selection.  
         Heat and Fire Resistance 
         Stainless  steels are used at temperatures up to about 2000 degrees F (the melting point  range for Type 304 is 2550 to 2650 degrees F.) While it is highly unlikely that  any sink would be subjected to such high temperatures, design professionals  should be aware of the mechanical characteristics of stainless steel when  exposed to increased temperatures, and be familiar with suggested maximum  service temperatures of stainless steel types. Since stainless steels have been  used for elevated temperature service, there is ample fundamental and practical  data concerning their resistance to corrosion. When they are exposed at elevated  temperatures, changes occur in the nature of the surface film. At mildly  elevated temperatures in an oxidizing gas, a protective oxide film is formed—as  mentioned earlier. In more aggressive environments with temperatures above 1600  degrees F., the surface film may break down with sudden increase in scaling  (visible oxide layers that reduce corrosion resistance). Depending on alloy  content and environment, the film may be self-healing for a period of time then  followed by another breakdown. 
          According to the SSINA, the suggested  maximum service temperatures in air for AISI Type 304 and Type 316 is 1600  degrees F for intermittent service and 925 degrees F. for continuous service. 
 
         Hygiene 
         The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. When properly cleaned and maintained, stainless steel surfaces resist growth of bacteria, mold and microorganisms that can cause disease. Surface finishes on stainless steel reduce bacterial attachment and early biofilm formation. The easy cleaning ability of stainless makes it the first choice for strict hygiene conditions, such as hospitals, clinics, schools, public restrooms, commercial kitchens and food processing. 
Several studies have documented its superior cleanability when new and used compared with other sink materials.
Stainless steels, mainly Type 304, have largely replaced traditional sink materials, such as vitreous china and solid surface materials, as stainless steel sinks can be kept scrupulously clean and withstand aggressive chemicals.  
Stainless steel thrives with frequent cleaning, and, unlike some other materials, it is impossible to “wear out” stainless steel by excessive cleaning. The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. 
Electron micrograph images of surface bacterial contamination before and  after cleaning sink materials.
Source: Sinks  of Stainless Clean Best, Beat Bacteria by Dr. John T. Holah, 1990, Nickel  Development Institute Publication 14008
         
	
         
 
         Strength to Weight Advantage 
         As  anyone who has hefted a chipped and rust-stained farmhouse sink to the town  disposal center will testify, some sinks not only lack durability, they are  also extremely heavy, which adds to freight and installation labor costs. While  epoxy resins and polymers are certainly lighter than stone and cast iron, they  do not compete in terms of weight with stainless steel, which is the lightest  and easiest sink material to ship. Moreover, as one manufacturer reports, the  freight damage rate is very low. 
          The work-hardening property of austenitic  grades results in a significant strengthening of the material. At room  temperature Type 304 and Type 316 have nominal yield strengths of 42000 psi and  nominal tensile strengths or ductility of 84000 psi. Such high strengths permit  reduced material thickness and therefore savings in costs. In contrast,  aluminum alloy (3003-H14) is less than a third and copper nearly one half that  of Types 304 and 316 in tensile strength. 
         Manufacturing Automation
         Modern  steel-making techniques mean that stainless steel can be cut, welded, formed,  machined, and fabricated as readily as traditional steels. The advantage of  using Types 304 and 316 with their nickel content for sink manufacturing is  that products, such as multiple sink units, can be die-drawn or pressed from a  single flat piece of steel, thus avoiding any seams.
            
High-speed laser cutting stainless steel
Photo: Just Manufacturing
   
			Maintenance and Staining 
         Stainless  steel sinks do not stain and can be easily wiped down and cleaned with a soap or mild detergent  solution and do not require toxic cleaning chemicals. Some manufacturers supply  cleaning kits for sinks with higher-end finishes, which may be more difficult  to maintain. Easy maintenance makes stainless steel sinks especially appealing  across all applications, especially schools and health-care facilities. 
Staining 
  Solid Surface: Over time scale build up and microscopic debris can adhere to the surface thus creating stains that can give an unsightly appearance and unsanitary environment. Also, due to microscopic porosity associated with sold surface materials staining is quote common. This could be caused by a multitude of liquids used in healthcare environments. Stainless steel withstands the full range of healthcare environment chemicals and the range of liquids used in healthcare exam and patient room environments. 
     
Follow a few simple steps and your stainless steel products will retain their original beauty for many years to come.
Photo: Just Manufacturing
   
	  
         Long Term Value 
         The durability of stainless steel has a cost-effective impact from a life-cycle perspective. Stainless steel requires only minimal maintenance, which is both economical and good for the environment and society. The combination of corrosion resistance and durability increases product lifetimes. When the total life cycle costs are considered, stainless is often the least expensive material option due to durability and low maintenance. 
Stainless steel sinks last 15 to 25 years and are most often replaced because of interior renovations or upgrades rather than degradation of the sink itself.
In certain cases, these cost savings can be in the range of 30 percent to 40 percent compared to alternative materials, and due to reduced repair and maintenance costs. 
Given the additional sustainability features of stainless steel, there is clearly long term value in specifying stainless steel sinks. 
 
         Sustainability
         Stainless steel is one of the most sustainable material choices available—more than paper or glass.  
Stainless steel is 100 percent recyclable. It is estimated that about 90 percent of stainless steels are recycled at the end of their life to produce more stainless steels and this process can be carried on indefinitely.
This means resources are saved and the same material is continuously cycled through the production chain in a sustainable closed-loop system, rendering it an eco-friendly material. 
Stainless steel products complete their service life
Image courtesy of SSINA
   
Ultimately, the most environmentally friendly materials are  corrosion-resistant, durable, produce no surface offgassing, include high recycled content and recapture rates,  reduce resource use and provide long service life. Stainless steel provides all  of these benefits. 
        
         With the growing demand for green  construction and expanding military, federal and state requirements for U.S. Green Building Council  (USGBC)  LEED® (Leadership in Energy & Environmental Design)  certifications, design professionals increasingly need to be familiar with sustainability  factors of all specified products.  
         While a single stainless steel sink would make a  negligible contribution to LEED calculations, several hundred sinks in a new  institution could make a worthwhile contribution in at least two categories in  the LEED 2009 for New Construction and Major Renovations:
         
           Recycled Content 
           Materials & Resources (MR)  Credit 4: Recycled Content offers 1-2 points. 
           Requirements: Use  materials with recycled content such that the sum of postconsumer recycled  content plus 1/2 of the preconsumer content  constitutes at least 10% or 20%, based on cost, of the total value of the  materials in the project. 
           The recycled content value of a material assembly is determined by  weight. 
           
         Unlike  other sink materials, stainless steel is easily recycled and recaptured. North America’s number one recycled material is steel. Each year,  more steel is recycled than aluminum, paper, glass and plastic combined.  Stainless steel is 100 percent recyclable into the same product with no  reduction in quality. The metal’s high scrap value and  recyclability ensures that it is diverted from landfills and recaptured for use  in new stainless steel. A recent international study by Yale  University’s Center for Industrial  Ecology, and National Institute for Environmental Studies, Tsukuba, Japan,  determined that about 92% of the  stainless steel used in building applications worldwide is recaptured and  recycled at the end of service. 
          In North America, stainless steel producing members of the  SSINA have indicated that the average  recycled content of the 300 series stainless steel grades that are used in the  construction market is approximately 90 percent. Certificates of  origin are provided for every coil of stainless steel delivered to fabricators.  Stainless steel producers also regularly provide sustainability statements. The  supplier for one large domestic sink producer states that the average recycled  content is greater than 90 percent and that all scrap is procured from sources  in North America. It goes on to report that  approximately 85 percent of the scrap was post consumer scrap with the  remaining 15 percent being post-industrial and home scrap. Post consumer scrap is  defined by LEED as waste material generated by households or by  commercial, industrial and institutional facilities in their role as end-users  of the product, which can no longer be used for its intended purposes. 
         
           Regional  Materials 
           MR Credit 5: Regional Materials, 1–2  Points
           Requirements: Use  building materials or products that have been extracted, harvested or  recovered, as well as manufactured, within 500 miles of the project site for a minimum of 10% or 20%,  based on cost, of the total materials value.
           
          LEED has ruled that the point of origin for  steel is the producing melt shop—regardless of where the scrap comes from. If  the sink manufacturing facility and producer are within 500 miles of the  project site, the products are eligible for LEED regional credit. 
         LEED Recertification 
         As LEED consultants are pointing out, initial  certification is not the end of the story. Recertification is required for all buildings  certified under a LEED Existing Building Rating System. All applications for  Operations & Maintenance Recertification must occur no sooner than one year  and no later than five years following initial certification. Catherine  Houska, a  leading international expert on the use of stainless steel in architecture,  reports that owners and building managers are increasingly  aware of LEED recertification requirements. “Environmentally safe cleaning products should be used  for building maintenance. Since there is no reason to use toxic chemicals on  stainless steel, the choice of stainless steel sinks, however small, can  indirectly contribute to recertification points.”
      
	  
	  Accessibility/ADA 
         Americans with Disabilities Act Accessibility  Standards provide requirements for sink ADA compliance in Chapter  3 - Section 306.2 Toe Clearance and Section 306.3 Knee Clerance (addresses  requirements for adults) and Chapter 6  Lavatories and Sinks (addresses additional requirements for children). Sink manufacturers  label their products ADA  compliant when they are able to comply in areas that relate to the height of  the counter, knee and toe clearance and the under-surface of the sink.
         
           Knee Clearance  and Countertop Height Counter 
           306.3.1 General.  Space under an element between 9 inches (230 mm) and  27 inches (685 mm) above the finish floor or ground shall be considered knee  clearance and comply with 306.3. and comply with 306.3.
           Chapter 606 Lavatories and Sinks.
           Please note 606.2.4, 606.2.6 and 606.2.7 are exceptions to the requirements of section 606.2. 
           606.2.4.  Clear Floor  Space.  A knee clearance  of 24 inches (610 mm) minimum above the finish floor or ground shall be  permitted at lavatories and sinks used primarily by children 6 through 12 years  where the rim or counter surface is 31 inches (785 mm) maximum above the finish  floor or ground. 
           606.2.6.  The dip of  the overflow shall not be considered in determining knee and toe clearances. 
           606.2.7.   No more than one bowl of a multi-bowl sink shall be required to provide knee  and toe clearance complying with 306 (Knee and Toe Clearance).
           606.3 Height.  Lavatories and sinks  shall be installed with the front of the higher of the rim or counter surface  34 inches (865 mm) maximum above the finish floor or ground. 
           
          The accessible space beneath the counter is  directly related to the size of the sink and how it is installed. The height of  the counter, on the other hand, is independent of both the sink size and type  of installation. There are two methods for installing countertop sinks:  self-rimming or drop-in and undermount. 
          A self-rimming sink has a  finished rolled edge and is installed (or “dropped-in”) on the top of the  counter.  An undermount or recessed sink is installed under a  countertop. 
 
          When  addressing ADA  knee clearance requirements with undermounted sinks, it is necessary to take  the thickness of the counter into account.
          For classroom and healthcare  environments, for example, manufacturers offer sinks with depths ranging from  4-1/2-in. to 6-1/2-in. in 1/2-in. increments. Countertop thickness is generally  assumed to be ¾-in. to 1-in. thick. To meet knee-clearance ADA requirements given a countertop of 1-in.  thick, an undermount sink should have a maximum depth of 6-in. 
          For applications that do not  require 24-in knee clearance, specifiers are free to choose sinks of any depth,  provided the countertop or sink rim is a maximum of 34-in. above the finished  floor and there is knee clearance of 27-in. Private or executive offices are  exempt from this requirement. 
         Since no more than one bowl of a  multi-bowl sink is required to provide knee and toe clearance, sink  manufacturers offer different solutions that are both ADA-compliant and have a  deeper sink. One solution is a split-level design, another is varying sink  depths in a multi-bowl unit, provided that appropriate clear floor space is provided.
         
		 
This multi-bowl unit with sinks of different depths meets ADA requirements.
Photo: Just Manufacturing 
   
		 
         
           Sink Undersurface 
           606.5 Exposed Pipes and  Surfaces. Water supply and drain pipes under lavatories and sinks shall be  insulated…There shall be no sharp or abrasive surfaces under lavatories and  sinks. 
         
          Higher end manufacturers fully  coat the underside of all sink models in order to both eliminate sharp or  abrasive surfaces and to provide insulation. Insulated coating reduces  condensation and sink sounds.
          ADA Compliant  sinks may be specified with the drain hole centered at the rear so that  drainpipes do not interfere with wheelchair access below the countertop. 
         
		 
18 gauge type 304 SL- ADA compliant single bowl max capacity sink with straight sided 1-3/4 radius bowl
Photo: Just Manufacturing 
   
		
         Specifying Stainless Steel Sinks
         In addition to understanding the features and benefits of stainless steel  and the requirements of ADA,  there are other factors that design professionals should be familiar with when  specifying sinks.
         Thickness
         The thickness of stainless steel is called its gauge, which ranges from over 30 to 3. The higher the gauge, the thinner the steel. Sinks are mostly manufactured from 16 gauge (0.0625-in), 18-gauge (0.0500-in. thick) and 20 gauge (0.0375-in.) sheet steel; the choice of gauge being dependent upon market sector, price points and application. Higher-end stainless steel sink manufacturers mostly use 18-gauge. Thinner gauge material, such as 22 and up, tend to dent, bow and transmit noise from pots and objects hitting the metal surface. 
         
		 
The ADA-compliant sink system above is a complete hands-free, heavy-duty commercial grade lavatory system.
Photo: Just Manufacturing 
   
  
         For its  government market sector, which includes VA hospitals, military bases, research  facilities, embassies, naval shipboard, GSA contract and DOD applications, one  manufacturer offers a comprehensive product line of drop-in, undermount, ADA, wall-hung and  free-standing fixtures. But each product is manufactured from the same American made  certified 18-8  stainless steel.
         Finishes
         Mill finishes offered at the lower end of the  market tend to be dull and matte. Satin and more polished finishes achieved by  mechanical polishing are applied at the sink manufacturer’s facility. Rough  finishes have poorer corrosion resistance and a poorer hygiene feature and are  therefore not generally selected for sinks. 
For commercial applications, blended satin finishes stand up best to every day heavy use environments.
          Highly polished finishes, more often found in Europe,  are produced by mechanically abrading the surface with a series of gradually  finer abrasives. The smoothest polished finishes are then buffed to produce a  mirror-like appearance. 
 
         Sink Dimensions
         Bowl  depth, taper and radius are the three basic sink measurements for comparing  sink sizes. The deeper the bowl, the straighter the slope; the smaller the  radius, the greater the sink capacity. 
		 
Sink combines extra deep  bowl depths and sharp radius large inside dimensions.
Photo: Just Manufacturing 
         
	
          
         Self-Rimming or Undermount?
         The  specification decision regarding self-rimming or undermount installation is  critical and can impact installation schedules and eventually the health of a  facility through inadequate cleaning. 
          In general, undermount sinks offer a more  pleasing aesthetic for custom- designed countertops because the sink does not  interrupt the visual plane of the countertop. They also allow for innovative  design. 
         For most institutional and commercial uses,  self-rimming or drop-in sinks offer many more benefits:  
         
           - Considerably more hygienic as there is no  gap where the edge meets the counter where dirt may be concealed. 
 
           - Easier to install
 
           - Gain three-quarters to one inch in ADA height requirements
 
           - Offers most amount of sink in a small  space where knee clearance is an issue
 
           - Complete seal is obtainable 
 
           - Often required in healthcare and food  preparation settings
 
           - Easier to replace or retrofit
 
           
		    
Example of Self-rimming Vs. Undermount sink.
Photo Courtesy of Just Manufacturing
  
      
           
 Wall-Hung Sinks 
If space is at a premium, you can not beat the functionality of a wall-hung sink.
There are several good reasons to consider a wall-hung sink.  
- They free up floor space 
 
- The sink will also be much easier to clean.
 
Example of wall-hung sinks
Photo: Just Manufacturing 
  
 Seamless Drain System
A product offered by one company incorporates a seamless drain system directly into the sink thus eliminating the seam edge where the drain and sink meet. Typically bacterial pathogens collect over time at this seam.
This innovative product offers ease of specification with existing stock models across a broad range of applications, providing a cleaner look which is also more hygienic as there is no seam for bacteria to build up in, from debris or waste.
Seamless die-drawn construction of 18-gauge type 304 stainless steel. This drain is seamlessly welded to the sink and includes strainer and tailpiece; self-rimming with stainless steel mounting channels.
Photo: Just Manufacturing 
  
The hard metallic surface of stainless steel makes it difficult for bacteria to adhere and survive. When properly cleaned and maintained, stainless steel surfaces resist growth of bacteria, mold and microorganisms that can cause disease.
Easy cleanability makes stainless steel the first choice for strict hygienic conditions.
         Certifications and Requirements
        
         There are two major  categories of certifications that apply to stainless steel sinks: ASTM (American Society for Testing and Materials), which refers to the raw  steel itself and ASME (American Society of Mechanical Engineers), which relates  to how it is used in a finished product. 
        
         ASTM. In the U.S.,  stainless steel mills certify each roll of steel as having met metallurgical  standards and consistency in production. Applicable standards include ASTM  A167, A176, A240, A480, A666. Some, but not all, steel manufactured outside of  the U.S.  carries assurances of metallurgical content or manufacturing consistency.
         ASME. Building inspectors generally require ASME certification on plumbing  fixtures. Sink manufacturers list products that conform to ASME certifications  such as ASME A112.19.3M. 
         ARRA. The American Recovery  and Reinvestment Act of 2009 (ARRA) stipulates  that iron, steel, and manufactured goods used in the construction of public  buildings be produced in the USA.  Sinks in ARRA projects—and there are still many projects in the pipeline—must  carry Made in America  certification. Certificates testifying to U.S.-made stainless steel sink  materials are obtained from the sink manufacturer.
         OSHA (Occupational Safety  and Health Administration) does not have any standard or regulation that makes  hands-free sinks a requirement. Neither does the CDC (Centers for Disease  Control) Guideline for Hand Hygiene in Health-Care Settings mention hands-free  sinks. However, Infection Control in  Ambulatory Care authored by the Association for Professionals in Infection Control and Epidemiology  (APIC) says: “Ideally, sinks should be equipped with foot- or elbow-operated  controls…many local or state public health codes regulate sink location and  type.” Essentially this comes down to budgetary constraints or clients’  policies that may require hands-free sinks in certain high-risk areas such as  the ICU, transplant unit, emergency departments, or operating room areas.
         OSHPD,  California’s  Office of Statewide Health Planning & Development,  requires  compliance in the mounting design of wall hung scrub sinks in areas prone to  earthquakes.
    
	Applications 
         While  every building needs sinks, each building type has its own requirements. 
		 
		 
Example of wall hung sensor  scrub sink.
Photo Courtesy of Just Manufacturing
  
        
    
         Schools/Academic
		 
        
         Astute sink selection can go a long way towards controlling operating  costs, reducing the incidence of vandalism and maintaining an appropriate  school environment. Vandalism in particular is a persistent problem with plumbing  being an easy target. Water damage can go beyond the cost of fixture  replacement to include flooring, walls, computers, books and electrical  circuitry. Specifying sinks designed to withstand heavy use and abuse goes a  long way to protect against vandalism and its costs.
          In offering ADA-compliant  sinks, one manufacturer can supply 18-gauge seamless die-drawn, durable satin  No. 4 finish stainless steel products. An identical sink in thicker more sturdy  16-gauge is also available. As an additional line of defense against vandalism,  it has designed a vandal-resistant integrated drain system that helps eliminate  water overflowing from the sink. 
Vandal-resistant integrated drain system that  eliminates water overflows.
Photo Courtesy of Just Manufacturing
  
         Assisted Living and Residence Halls
         Stainless  steel products are ideal for assisted living installations because of their  ease of maintenance. 
         
Often specified for assisted living and dormitory applications, this single bowl drop-in sink is ADA-compliant with depth range from 4½–6½ inches and has integrated overflow system.
Photo Courtesy of Just Manufacturing
  
         Healthcare
                    Stainless steel is an obvious choice for sinks in patient towers, clinics,  surgical areas and laboratory installations due to its sanitary benefits,  durability and design versatility. Manufacturers offer a wide range of products  that include sensor-operated surgical suite  scrub stations, surgical wash-up sinks, surgical instrument tray sinks,  inpatient room sinks, clinical sinks, lavatory sinks and custom application  specific sinks and sink tops. 
          Specifiers  should be aware of state and local regulations such as OSHPD’s  requirements for wall-hung scrub sinks in earthquakeprone areas. 
        
Triple station surgeon's 16-gauge scrub sink has removable Plexiglas partitions and is preapproved by OSHPD 
Images courtesy of Just Manufacturing
 
	
          
         Hospitality 
         With their heavy use, hotel suite projects require  durable commercial sinks with a design flair. Many leading hotel corporations  have standardized sink choices for their different hotel brands.
         Food Service 
         Since scullery sinks  for food service installations have one of the greatest requirements for  durability, manufacturers offer products in 14-gauge stainless steel.
         
		 
Single bowl undermount 18-gauge type 304 hotel suite application.
Photo Courtesy of Just Manufacturing
 
          
         Conclusion 
         From their documented hygienic and corrosion-resistant features to  their  virtually unparalleled  sustainability, stainless steel sinks offer numerous advantages for design  professionals. They are an appropriate choice for a multitude of standard  building types and, with informed specification, deliver solutions for unique  applications. They compete price-wise with other sink materials and meet ADA and special state and  local building requirements. Further, offered in different steel gauges and a  wide range of dimensions, they should satisfy virtually any design  specification challenge and provide long-term value. 
   
		 
		 
  
    
      
         
      
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       Innovation, automation and creative logistics have offered Just a marketplace reputation among specification and design professionals as a world leader in the design, production and distribution of commercial grade stainless steel sinks and related plumbing fixtures and accessories. www.justmfg.com
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