Willseal STC | Tremco Sound and Dust Barrier for Static Interior Applications
The Willseal STC is a specialized joint sealant designed to block sound, dust, drafts, and thermal transfer in static interior joints. Constructed with fire-resistant acrylic-impregnated polyurethane foam, this compressible seal is ideal for both vertical and horizontal joints in spaces where superior noise reduction and environmental separation are needed. Its flexibility and simple installation make it a reliable solution for projects prioritizing acoustic and environmental performance.
Key Benefits of Willseal STC
- Delivers maximum sound control for static applications like offices, lobbies, and conference rooms
- Constructed from fire-resistant polyurethane foam for added safety
- Provides long-term flexibility and ease of installation without invasive anchoring
- Blocks dust, drafts, heat, and cold in interior partition and window-to-wall connections
- Available factory-coated with silicone sealant on 1, 2, 3, or 4 sides in standard or custom colors
- Suitable for both vertical and horizontal joint applications
- Designed to integrate with Tremco joint and partition sealing systems
Common Applications
Willseal STC is best suited for use in window-to-wall connections, moveable or permanent partitions, lobbies, conference rooms, curtain walls, and offices where sound reduction and environmental sealing are critical. Its robust design ensures long-lasting performance without compromising aesthetics or safety.
Packaging and Performance
Willseal STC is supplied in flexible, compressible profiles, ready to install, minimizing labor and enhancing project efficiency.
Product Properties
| Property | Value |
|---|---|
| ASTM C518: Thermal Conductivity | 0.33 to 0.347 Btu-in/hr-ft²-°F |
| Foam Color | Black |
| Storage Temperature | 68 °F (20 °C) |
| Temperature Stability | Short term: -40 to 248 °F (-40 to 120 °C) | Long term: -40 to 194 °F (-40 to 90 °C) |
For a primary exterior joint sealing solution, see Willseal 150. Additional Tremco joint sealing products can be found at TremcoSealants.com.
