Boss 812 Fire Block Foam

Boss 812 Fire Block foam – smoke stop with insulation and acoustic properties.  Tested as ASTM E-84 classified Class A.  12 oz.


Boss 812 is a single component polyurethane foam designed to prevent the spread of smoke and poisonous gases from one area to another, through gaps and voids in non-fire rated wall and floors.  It may be used in virtually all through-penetrations, in both horizontal and vertical applications.  It cures to form a semi-rigid non-sag seal.  Expands and bonds quickly and has excellent adhesion to most building substrates.