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SpecSeal SIL Silicone Firestop Sealant | Class 1 W Ratings
One-part, neutral-cure silicone firestop sealant for sealing openings in walls and floors to control the spread of fire, smoke, toxic gases, and water during fire conditions.
Available in non-sag (SIL300) and self-leveling (SIL300SL) grades with excellent water resistance, UV/ozone stability, and Class 1 W Ratings (UL1479).
Tested to ASTM E814 (UL1479), ASTM E1966 (UL2079), CAN/ULC-S115 — ratings up to 4 hours in tested systems.
Key Features & Benefits
- Neutral-cure silicone; adheres to most substrates without primer
- Low modulus for dynamic joints; excellent recovery after movement
- Class 1 W Ratings (UL1479) for water-tight sealing where required
- Excellent water resistance, UV and ozone resistance for long service life
- Superior smoke seal and chemical resistance; suitable for polluted/corrosive atmospheres
- Auto-bonding — new sealant adheres to cured sealant to simplify repairs
- Non-halogenated; no asbestos, no PCBs; LEED v3/v4/v4.1 low-emitting materials credit eligible
- Meets ASTM C920 (SIL300: Type S, Grade NS, Class 50; SIL300SL: Type S, Grade P, Class 25)
Applications
- Through-penetration firestop systems and joint systems
- Non-combustible penetrants; electrical/data/telecom cables
- Construction gaps, expansion joints, perimeter/curtain wall safing, and top-of-wall joints
- Vertical and horizontal joints between metals, masonry, concrete, and common substrates
Physical Properties — As Supplied
| Property | SIL300 (Non-Sag) | SIL300SL (Self-Leveling) |
|---|---|---|
| Consistency | Trowelable | Pourable |
| Density / Weight per Gallon | 11.6 lb/gal | 11.5 lb/gal |
| Solids by Weight | 100% | 85% |
| Viscosity | 1,200,000 cps | 25,000 cps |
| Application Temperature | 35°F (-37°C) to 140°F (60°C) | 35°F (-37°C) to 140°F (60°C) |
| Storage Temperature | ≤ 80°F (27°C) | ≤ 80°F (27°C) |
| VOC Content | 20 g/L | < 47 g/L |
| Shelf Life (from manufacture) | 18 months | 18 months |
| Tooling Time | 25–30 minutes | 25–30 minutes |
| Tack Free (ASTM C679, 77°F/50%RH) | 3–4 hours | 50–60 minutes |
| Sag/Slump (ASTM D2202) | 0.1” max | N/A |
| Storage Warranty Period | 12 months from shipment in unopened container at ≤ 80°F (27°C) | |
Physical Properties — Cured
| Property | SIL300 (Non-Sag) | SIL300SL (Self-Leveling) |
|---|---|---|
| Color | Concrete (limestone) | Gray |
| Flame Spread / Smoke (ASTM E84) | 5 / 45 | 5 / 45 |
| Mold & Fungus (ASTM G21) | 0 | 1 |
| Movement Capability | ±50% (ASTM C719); ±35% (ASTM E1399) | ±50% (ASTM C719); ±15% (ASTM E1399) |
| In-Service Temperature | -35°F (-37°C) to 350°F (177°C) | -35 |
