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STI FP Intumescent Firestop Plug

Availability: In stock

SpecSeal FP Intumescent Firestop Plugs are easy to install, creating a robust seal against fire and smoke. Firestop Plugs make an excellent solution for temporary installation overnight as well as permanent long-term seals for blank openings and cable penetrations. Sized to fit 2" and 4" diam. openings, firestop plugs make sealing conduit stubs and sleeves a breeze.

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Product Description


  • Testing in Gypsum walls and concrete walls and floors
  • Soft and easily compressed into conduit stubs and sleeves
  • No expiration date
  • Partners with other SpecSeal Firestop Products
Application Properties
Blank Opening Finished Product
Cables Intumescent
  Light Weight
  Low VOC
  No Expiration
  Smoke Barrier
  STC Rating

Physical Properties

Property Value
Colour Red
Density 19 pcf (304 kg/cu m)
Weight 2" - 0.20 lb (91 g),
4" - 0.50 lb (227 g),
5" - 0.50 lb (227 g)
Expansion Begins 350°F (176°C)
Volume Expansion 10x
In Service Temperature Less than 130°F (54°C)
Storage Temperature Less than 130°F (54°C)
VOC Content N/A
Shelf Life No Limit


Ordering Information

Catalogue Number Description (UOM) Qty. Case Qty. Weight (Each)
STI_FP200 Firestop Plug sized for 2" (51 mm) opening/sleeve 1 10 0.27 lbs (0.12 kg)
STI_FP400 Firestop Plug sized for 4" (102 mm) opening/sleeve 1 10 0.61 lbs (0.28 kg)
STI_FP500D Firestop Plug sized for 5" (127 mm) opening/sleeve. For sealing drain pipe penetrations in concrete floors only 1 10 0.59 lbs (0.27 kg)