3M MP+ STICK Fire Barrier Modable Putty Stix, Red-BrownFirestop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) & CAN ULC S115. Putty provides draft and cold smoke seal. Pliable and conformable design easily molds into required shapes. Helps reduce noise transfer (STC Rating of 56 when tested in STC 56 rated wall assembly). Will not dry out or crumble for a re enterable and repairable solution. Excellent adhesion and aging properties provide a long term performance. Noncorrosive to metal and