SoudaFoam Fireblock is a top of the line, one component, moisture curing PU-Foam designed especially to help prevent the spread of flames and smoke in residential Type VB and commercial non-rated construction. Perfect for insulating, sealing and filling all types of joints and openings. Tested according to ASTM E84, ASTM E814 (modified), NFPA286, ICC QAA by UL.