Minimal Expanding Foam 334 (24 Oz)

BOSS 334 Window & Door Minimal Expanding Foam is a one-component, ready to use polyurethane foam, formulated to seal the gap around window and door frame and the rough opening. BOSS 334 expands to generate an effective seal, and when used properly is proven not to distort or bow window and door frames. BOSS 334 will achieve a Sound Transmission Class (STC) of 58 when applying it in accordance with ASTM C-919 Standard Practice for use of Sealants in Acoustical Applications.