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The SpecSeal® LC Endothermic Firestop Sealant | 4-Hr UL Rating
High-solids, latex-based endothermic firestop sealant for construction joints and penetrations —
tested to UL1479 / ASTM E814, UL2079 / ASTM E1966, and CAN/ULC-S115. Provides up to 4-hour
protection in tested systems with excellent smoke sealing and paintable finish.
Key Features & Benefits
- Water-based, high-solids formula for easy installation and cleanup
- Endothermic fillers absorb heat & release water for enhanced fire resistance
- Up to 4-hour UL-classified fire rating in tested systems
- Flexible, non-shrinking barrier with excellent smoke sealing
- Adheres to concrete, masonry, gypsum, and steel
- Non-halogenated, asbestos-free, low VOC; LEED compliant
- Paintable finish; installer-friendly with high build capability
- Red color for quick inspection and identification
Applications
- Construction joint & gap sealing in walls and floors
- Through-penetration firestopping of noncombustible penetrants (up to 30″ diameter)
- Multiple penetrant firestopping in masonry and gypsum assemblies
- Electrical & communications cable penetrations; steel-sleeved penetrations
- Commercial, industrial, and institutional projects
Product Specifications
| Color | Deep Red |
|---|---|
| Density | 10.7 lb/gal (1.28 kg/L) |
| Solids (by weight / volume) | 81% / 75.2% |
| VOC Content | 57 g/L |
| Movement Capability | ±12.5% or 25% compression only |
| In-Service Temperature | ≤ 185°F (85°C) |
| Application Temperature | 35°F to 100°F (2°C to 38°C) |
| Shelf Life | 24 months |
| Standards / Tests | ASTM E814 (UL1479), ASTM E1966 (UL2079), CAN/ULC-S115 |
Always install per tested system details and manufacturer instructions.
Available Variants
| Catalog No. | Size & Volume | Qty. | Case Qty. | Weight (Each) |
|---|---|---|---|---|
| LC150 | 10.1 oz Tube (300 ml) | 1 | 12 | 0.96 lbs |
| LC120 | 20 oz Sausage (592 ml) | 1 | 12 | 1.70 lbs |
| LC129 | 29 oz Tube (858 ml) | 1 | 12 | 2.56 lbs |
| LC155 | 5 Gallon Pail (19 L) | 1 | 1 | 55.81 lbs |
Certifications & Test Standards
- UL1479 / ASTM E814 — Fire Tests of Penetration Firestop Systems
- UL2079 / ASTM E1966 — Fire-Resistive Joint Systems
- CAN/ULC-S115 — Fire Tests of Firestop Systems
- LEED v4.1 — Low-Emitting Materials credit eligible
FAQs
- What is the fire rating?
- Up to 4 hours when installed in tested systems per UL1479 / ASTM E814 and CAN/ULC-S115.
- Can it be painted?
- Yes. After full cure, the sealant is paintable for a clean finish.
- Is it safe for occupied buildings?
- Yes. It’s non-halogenated, asbestos-free, and low VOC.
