Product Description

The STI SpecSeal® FP Intumescent Firestop Plug is a soft, resilient polyurethane foam plug designed for quick and easy penetration firestopping.
Conveniently sized for 2”, 4”, and 5” openings or sleeves, the plugs expand up to 10× when exposed to heat, quickly sealing around cables and pipes.
Ideal for temporary or permanent firestop solutions, they are UL Classified and tested to ASTM E814 (UL1479) and CAN/ULC-S115.

Key Benefits

• Intumescent Action – Expands up to 10× under fire to seal combustible voids.
• Reinstallable – Allows easy retrofit or removal of cables and pipes.
• Tool-Free Installation – Simply press into opening; no curing required.
• Durable & Flexible – Conforms to cable and pipe surfaces for tight seals.
• Versatile Applications – Suitable for cables, metallic/non-metallic pipes, drains, and blank openings.
• UL Certified – Fire-rated up to 2 hours in tested assemblies.

Packaging

• FP200: 2” plug (51 mm), 0.20 lb (91 g), 10 pcs/case
• FP400: 4” plug (102 mm), 0.50 lb (227 g), 10 pcs/case
• FP500D: 5” plug (127 mm), 0.50 lb (227 g), 10 pcs/case – for drain pipe penetrations
• Color: Red
• Shelf Life: Unlimited (store below 130 °F / 54 °C)