Our SpecSeal® FP Intumescent Firestop Plugs are designed for temporary or permanent sealing of cable and pipe penetrations through fire-rated construction. These soft, supple foam plugs expand 10 times their original size when exposed to heat, providing up to 2-hour fire ratings while maintaining easy reinstallation capability for future cable modifications.

Key Features & Benefits

Intumescent expansion – expands 10x in all directions when exposed to heat at 350°F
Reinstallable design – easy retrofitting and cable modifications without replacement
2-hour fire rating – UL classified systems tested to ASTM E814 (UL1479) standards
Easy installation – no special tools required, conforms to irregular surfaces
Soft resilient foam – 19 pcf density provides superior sealing around cables and pipes
Paintable surface – can be painted to match surrounding construction
Multiple sizes – 2″, 4″, and 5″ diameter options for various opening requirements
Long shelf life – unlimited storage life with proper temperature conditions

Product Models & Specifications

Physical Properties

Material – Polyurethane foam with intumescent additives
Color – Red for easy identification and inspection
Density – 19 pcf (304 kg/m³) for optimal expansion characteristics
Service temperature – Less than 130°F (54°C) continuous operation
Storage conditions – Less than 130°F (54°C), unlimited shelf life