STI Firestop LC120 LC Endothermic Sealant RED (20oz Sausage Tube)


STI Firestop Sealant

STI Firestop SpecSeal® LC Endothermic Sealant is a latex-based gun grade firestop sealant for construction joints and non-combustible penetrations. After application, LC Sealant cures to form a flexible seal against the propagation of fire. Under fire exposure, LC absorbs heat and release water vapor resisting the progress of smoke and flame.

STI Firestop is manufactured by Specified Technologies Incorporated, which is a leading expert in developing innovative fire protection systems that help stop the spread of fire, smoke, toxic fumes, and hot gases.

  • Installer Friendly, easily applied with standard caulking gun
  • Can be troweled on for larger applications
  • Tested for up to 4 Hours of fire resistance when tested to ASTM E1966/UL2079, ASTM E814/UL1479, and CAN/ULC-S115
  • Listed in over 80 UL® Tested Firestop Systems!


Physical Properties
Color White
Odor Mild Latex
Density 11.4 lbs/gal (1.36 kg/L)
Solids Content by Weight 80%
Solids Content by Volume 74.3%
pH 7.4 to 8.4
In-Service Temperature 185 F (  85 C)
Storage Temperature 40F (4C) – 95F (35C)
Flame Spread 0*
Smoke Developed 10*
Movement /- 12.5% or 25% in compression only****
STC Rating 61 (Relates to specific construction) (ASTM E 90-04/ASTM C919)
VOC Content (EPA Method 24/ASTM D3960) 0.50 lb/gal (60 g/liter)
Shelf Life 2 Years
*ASTM E84 (UL723) @ 14% Surface coverage. (Modified test for sealants and caulks.)
****500 Cycles per UL2079, AC30 (ICBO) and ASTM E1399
Weight 1 lbs
Dimensions 14 × 14 × 20 in

SKU: LC120 Category: Tags: , , , Barcode: 730573011331.
Weight 1 lbs
Dimensions 14 × 14 × 20 in