Mullion Mate - Partition Gap Closures deliver a sleek, high-performance solution for closing vertical gaps between glass facades and interior partition walls. Engineered from durable extruded aluminum, Mullion Mate® combines high STC-rated acoustics, up to 2-hour fire resistance and the flexibility to accommodate building movement from seismic, thermal, and wind-sway activity. Designed to integrate seamlessly with modern interiors, it enhances safety, comfort, and design integrity. With over 35 years of proven performance, Mullion Mate® - the original partition gap-closure remains the trusted choice for architects and contractors seeking high performance without compromising design.