Our Products

STI LCI Intumescent Firestop Sealant

Availability: In stock

SpecSeal LCI Firestop Sealant is a water-based intumescent sealant intended for a wide range of through-penetration and construction joint applications. SpecSeal LCI Sealant has excellent caulking properties making it easy to apply in vertical applications as well as overhead.

Share this to:

Product Description


  • Gun Grade material available in caulk tubes, sausages and pails
  • Tested for use in through-penetration and construction joint configurations
  • Compatible with CPVC Piping
  • Can be sanded and painted to match its surroundings
  • Used in over 500 UL Tested Systems

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


Physical Properties

Property Value
Colour Red
Density/Weight per Gallon 12.3 lb/gal (1.47 kg/L)
Solids Content by Weight 80.0%
Solids Content by Volume 70.8%
Flame Spread 0*
Smoke Development 0*
Mold & Fungus Growth Rating (ASTM G21) 0
Movement Capabilities

33% Compression Only Class II Coverage

For more information on product coverage see the following documents for Linear Joint & Penetration

pH 9
In Service Temperature Less than or equal to 185°F (85°C)
Storage Temperature 40°F (4°C) to 95°F (35°C)
Application Temperature 35°F (2°C) to 100°F (38°C)
STC Rating (ASTM E90-04/ASTM C919) 62 (Relates to Specific Construction)
VOC Content 26 g/L**
Expansion Begins 350°F (177°C)
Average Volume Shrinkage (ASTM C1241) 21.1%
Volume Expansion 10x 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_LCI300 10.1 Oz. Tube - 18.2 cu. in. (300 ml) 1 12 1.05 lbs (0.48 kg)
STI_LCI305 5 Gallon Pail - 1,155 cu. in. (19 liters) 1 1 61.39 lbs (27.84 kg)
STI_LCI320 20 Oz. Sausage - 36 cu. in. (592 ml) 1 12 1.9628 lbs (0.89 kg)
STI_LCI329 29 Oz. Tube - 52.3 cu. in. (858 ml) 1 12 2.94 lbs (1.33 kg)