STI LC155 sealant is a latex-based, high solids firestop compound This material, when properly installed, will effectively seal penetration openings against the spread of fire, smoke, toxic gasses and water. STI LC155 is engineered to adhere well to virtually all construction surfaces and may be applied using a standard caulk gun or by troweling with a standard mason’s trowel or with a putty knife. STI LC155 dries without shrinking to form a flexible shield against the propagation of fire. Its premium latex binder system is totally resistant to water and will not re-emulsify after drying. STI LC155 is non-halogenated, contains no asbestos, inorganic fibers or solvents. 

• Water-Based
• for easy installation, cleanup, and disposal.
• Endothermic Fillers to absorb heat & release water.
• High Solids Formula means no shrinkage!
• Paintable (when dry)
• Safe No Solvents! Non-Halogenated! Low VOCs
• Red Color for easy identification and inspection.
• Installer Friendly Excellent caulking properties along with high build capabilities.
• Excellent Smoke Seal
• Piping: non-combustible steel, iron, cast iron and copper up to 24 in diameter.
• Complex multiple penetrants
• Communication cabling systems.
• Construction joints.
• HVAC ducts.
• Color
• Red
• 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 40?_F (4?_C) - 95?_F (35?_C)
• 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