TREMstop™ FBF is a Class III, single-component, gun-grade polyurethane fire-block foam that cures rapidly to form a rigid, durable seal. It is designed to block or reduce air movement around small interior through-wall penetrations, helping to limit oxygen flow and slow flame propagation during a fire event. Once cured, the foam resists flame, heat, water, decay, and many common chemicals.
Basic Uses
Ideal for interior backfilling and insulation applications, including sealing window and door frame joints. Suitable for sealing ½ in. to 1 in. interior wall penetrations associated with:
Electrical penetrations and boxes
Plumbing penetrations
HVAC openings
Features & Benefits
Rapid curing for faster installation and reduced labor time
Excellent adhesion to common construction substrates
Compatible with concrete, masonry, stone, plaster, wood, fiber cement, metal, and many plastics
Good dimensional stability
High-visibility orange color for fire-block identification
ASTM E84 Class III rated
Provides air sealing with added sound and thermal insulation
