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STI SSS Intumescent Firestop Sealant

Availability: In stock

SpecSeal SSS Firestop Sealant is a premium grade water-based Intumescent firestop sealant. SpecSeal SSS Sealant incorporates our proprietary two-stage intumescent technology making it the go to choice for any combustible or non-combustible penetrants. As little as a 1/2" applied depth of SSS Sealant is required to provide up to a 4 Hr Fire resistance rating when tested to ASTM E814/UL 1479.

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Product Description


  • Patented Two-Stage Intumescent Technology
  • Easily works into tight spaces between penetrants
  • Compatible with CPVC Piping
  • Can be sanded and painted to match its surroundings
  • Used in over 500 through-penetration UL Tested Systems!

Application Properties
Blank Opening Autobonding
Busway Intumescent
Cables Low VOC
Cable Tray Paintable
Duct Permanent
Head of Wall Smoke Barrier
Metal Pipe STC Rating
Multiple Penetrations Water Based
Plastic Pipe  


Physical Properties

Property Value
Colour Red
Density/Weight per Gallon 12.03 lb/gal (1.44 kg/L)
Solids Content by Weight 79.20%
Solids Content by Volume 70%
Flame Spread 0*
Smoke Development 0*
Mold & Fungus Growth Rating (ASTM G21) 0
Coverage For more information on product coverage see the following documents for Linear Joint & Penetration
pH 8.3
In Service Temperature -10°F (-23°C) to 185°F (85°C)
Storage Temperature 40°F (4°C) to 95°F (35°C)
Applicaton Temperature 35°F (2°C) to 100°F (38°C)
STC Rating (ASTM E90-04/ASTM C919) 62 (Relates to Specific Construction)
VOC Content 29.2 g/L**
Expansion Begins 230°F (110°C) 1st Stage, 350°F (177°C) 2nd Stage
Expansion Range 230°F to Less than 1,000°F (110°C to Less than 538°C)
Average Volume Shrinkage (ASTM C1241) 25.40%
Volume Expansion 8x Free Expansion
Shelf Life From Date of Manufacture 24 months
  • *Tested to ASTM E84 (UL723) at 14% surface coverage (modified test for sealants and caulks)
  • **Per SCAQMD Rule 1168 (EPA Method 24)

Ordering Information

Catalogue Number Description (UOM) Qty. Case Qty. Weight (Each)
STI_SSS100 10.1 Oz. Tube - 18.2 cu. in. (300 ml) 1 12 1.07 lbs (0.49 kg)
STI_SSS102 2 Gallon Pail - 462 cu. in. (7.6 liters) 1 N/A 23.29 lbs (10.56 kg)
STI_SSS105 5 Gallon Pail - 1,155 cu. in. (19.0 liters) 1 N/A 62.45 lbs (28.33 kg)
STI_SSS120 20 Oz. Sausage - 36 cu. in. (592 ml) 1 12 1.86 lbs (0.84 kg)
STI_SSS129 29 Oz. Tube - 52 cu. in. (858 ml) 1 12 2.84 lbs (1.29 KG)