Willseal Seismic HS Expansion Joint Seal
Willseal® Seismic HS is a pre-compressed, self-expanding foam joint seal with a factory-applied silicone sealant face. Designed for watertight, thermally insulating, and UV-stable horizontal applications, this expansion joint accommodates ±50% movement and reduces noise and thermal transmission.
Key Benefits of Willseal Seismic HS
- Watertight Seal: Hydrophobic open-cell foam with acrylic polymer and silicone sealant resists water and moisture.
- Flexible Design: Accommodates ±50% movement, ideal for seismic activity and shifting substrates.
- Easy Application: Factory-finished and installed without invasive anchoring or bond-breaking laminations.
- Enhanced Aesthetics: Available in standard or custom colors for seamless visual integration.
Common Applications
- Seismic and primary structural joints
- Retrofit and precast concrete floor-to-wall transitions
- Exterior panel systems and façade connections
Packaging & Technical Info
- Factory-applied silicone sealant for horizontal use
- Delivered pre-compressed for faster installation
- Available in multiple sizes and color options
Product Properties
| Property | Value |
|---|---|
| ASTM C518: Thermal Conductivity | 0.05 W/m•°C |
| ASTM D3574: Ultimate Elongation | 125% ± 20% |
| Foam Color | Black |
| Temperature Stability | -40 to 185 °F (-40 to 85 °C) |
Looking for a related solution? View the Willseal 250 horizontal sealant. Visit Tremco’s website to explore all compatible systems.
