Specified Technologies Series LC Endothermic Sealant 29 oz. Tube 52 Cu. In. (858 ml)

Reference#: 73410
Item#: LC129


LC Endothermic Firestop Sealant

A latex-based, high solids firestop sealant. When properly installed, it effectively seals penetration openings and joints against the spread of fire, smoke and toxic gases.

SpecSeal® Series LC 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.

Series LC 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.

Series LC 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. SpecSeal Series LC Sealant is non-halogenated, contains no asbestos, inorganic fibers or solvents.


  • Water-based – easy installation, cleanup and disposal.
  • Endothermic fillers – absorb heat and release water.
  • High solids formula – no shrinkage!
  • Paintable (when dry)
  • Safe – low VOCs, no solvents, non-halogenated
  • Excellent sealing properties along with high build capabilities
  • Excellent smoke seal
  • Red Color for easy identification and inspection

    Common Applications:
  • Piping: non-combustible steel, iron, cast iron and copper up to 24” in diameter
  • Complex multiple penetrants
  • Communication cabling systems
  • Construction joints
  • HVAC ducts
  • Specification

    Color: Red
    Odor: Mild Latex
    Density: 11.4 lbs/gal (1.36 kg/L)
    Solids Content: 80% + 2%
    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*
    STC Rating (ASTM E90/ASTM C919): 61
    VOC Content
    (EPA Method 24/ASTM D3960): 33.3 lb/gal. (40.0 g/L)
    Shelf Life: 2 Years