3M red four hour fire rating moldable putty stick 1.4 Inch X 11 Inch.

Firestop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) CAN/ULC S115Putty provides draft and cold smoke sealPliable and conformable design easily molds into required shapesHelps 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 solutionExcellent adhesion and aging properties provide a long-term performanceNoncorrosive to metal and compatible with synthetic cable jacketsLow VOC, halogen-free and solvent-free formula for safe working environment with minimal odor