SpecSeal LC129 Endothermic Firestop Sealant – 29 oz Tube
- Package: 29 oz tube
- Chemistry: Latex-based endothermic sealant
- Use: Construction joints, gaps, and noncombustible penetrations in applicable listed systems
- Finish: Paintable when dry
- Safety: Conductive until dry; do not apply to or in the presence of energized or exposed electrical conductors
SpecSeal LC129 is a high-solids, latex-based endothermic firestop sealant in a 29 oz tube. When properly installed in an applicable listed system, it seals penetration openings against the spread of fire, smoke, hot gases, and water. Use it for construction joints, gaps, and noncombustible penetrations covered by the specified design.
Application and Adhesion
SpecSeal LC sealant adheres well to virtually all construction surfaces and applies with a standard caulk gun sized for the 29 oz tube. For larger applications, you can trowel it on with a standard mason’s trowel or apply it with a putty knife. Follow the applicable listed design for backing, sealant depth, and other installation requirements.
Flexible Seal With Minimal Shrinkage
Series LC dries with minimal shrinkage to form a flexible seal. Its endothermic fillers absorb heat and release water. Once dry, the latex binder resists water and will not re-emulsify, and the surface can be painted. The compound is non-halogenated and contains no asbestos or inorganic fibers.
- Standard-tool application: Apply with a 29 oz caulk gun, mason’s trowel, or putty knife
- Minimal shrinkage: High-solids formula dries to a flexible seal
- Water resistance after drying: Latex binder will not re-emulsify
- Paintable finish: Paint once the sealant is dry
Fire Resistance in Listed Systems
SpecSeal Series LC has been tested for up to 4 hours of fire resistance under ASTM E1966/UL 2079, ASTM E814/UL 1479, and CAN/ULC-S115. It is listed in more than 80 UL-tested firestop systems. The rating and suitability depend on the specific tested assembly and installation; these results do not give every LC129 application a 4-hour rating.
LC129, LC120, or LCI?
LC129 and the SpecSeal LC120 20 oz sausage belong to the same LC endothermic sealant family, but their package formats differ. LC129 is the 29 oz tube; LC120 is the 20 oz sausage.
SpecSeal LCI intumescent sealant is a separate product family. Don't treat LC and LCI as interchangeable. Use the sealant named in the applicable listed design.
System Selection and Electrical Safety
LC129 isn't suitable for every fire-rated assembly. The applicable listed system determines the assembly, penetrant, annular space, backing material, and sealant depth. Check the STI system finder for a design that matches your application; the product name alone doesn't establish a fire rating.
Electrical warning: This sealant contains water and is electrically conductive until dry. Do not apply it to or in the presence of energized electrical conductors. Do not apply it in the presence of exposed electrical conductors.
Browse the firestop sealants and fire tape collection to find the product specified for your application.
Specifications
| Specification | Detail | Specification | Detail |
|---|---|---|---|
| Brand | SpecSeal | Manufacturer | Specified Technologies Inc. (STI) |
| Manufacturer Part Number | LC129 | Sealant Type | Latex-based endothermic |
| Package Format | 29 oz tube | Stated Volume | 52 cu in (858 ml) |
| Application Temperature | 35°F–100°F (2°C–38°C) | Paintability | Paintable when dry |
| Shelf Life | 24 months from manufacture | VOC Content | 57 g/L |