Great Stuff Fire Block Spec Sheet, It has led the way in the industry by being recognized as a Use around air ducts to seal gaps Seal pipe penetrations Seal electrical runs through wall studs Consult label and Material Data Safety Sheet carefully before use. Designed for residential construction, it provides an easy and effective way to maintain the continuity of an approved fire block material. Great StuffTM Pro is a moisture-curing one-component polyurethane gun foam sealant. It is both cost effective and effective as an air sealant. Fills gaps up to 1". GREAT STUFFTM Fireblock Insulating Foam Sealant is a minimal expansion polyurethane insulating foam sealant that fills, seals and insulates gaps up to 3/4 inch. Heat resistant up to 240°F. This distinctly orange solution seals electrical wiring run through wall studs as well as service penetrations in walls and between floors to provide a simple, cost-effective way to maintain the continuity of an approved GREAT STUFF 99053992. › Great StuffTM Pro Gaps & Cracks Fireblock Sealant PRODUCT DESCRIPTION Great Stuff Pro Gaps & Cracks is a one-component, multipurpose, low-expansion construction fi ller and fi reblock sealant. It contains an environmentally safe propellant, which complies with the latest EU regulations banning all CFC- and HCFC-propellants. oblk, wrcw, iks, rnc, rpt5k, epph, scy, ncpy9j, cp, owgs,