Premier Building Solutions XtraFoam FB Expanding Foam is a one-component, multipurpose, polyurethane foam that is specially formulated to be applied in areas where wall systems require an ASTM-E84 fire resistance rating. The product can be used to form an insulating barrier to block smoke, gas, drafts, moisture and insects. XtraFoam FB’s advanced chemistry ensures excellent adhesion to most substrates, and provides an excellent water-resistant, airtight seal. XtraFoam FB Expanding Foam offers outstanding thermal and acoustical insulation and contains no CFC’s or HCFC’s, so it is environmentally friendly. Ensure that suitable extractors are available on processing machines and also ensure good ventilation/exhaustion at the workplace. Open and handle receptacle with care.