Bostik Chem-Calk GPS1 Bronze Polyurethane Sealant

Description

Chem-Calk GPS1 is a bronze, one-component polyurethane sealant for exterior building joints and general sealing work. It is a non-sag, moisture-curing sealant used where crews need flexible movement, paintable chemistry, and adhesion to common construction materials.

Chem-Calk GPS1 Benefits

• Polyurethane chemistry cures to a flexible elastomer for exterior joint movement.
• Non-sag consistency helps the bead stay in place on vertical and overhead details.
• Bronze color supports metal trim, flashing, roofing, and exterior finish work.
• Suitable for indoor and outdoor applications when the joint design matches the sealant.
• Paintable with latex-based paints after proper cure and compatibility testing.

The product data describes GPS1 as a general purpose sealant for roofing components, soffit and fascia, termination bar, and exterior sealing between dissimilar building materials. It is not recommended for glazing applications where UV passes through clear materials. Bronze color can also help the bead visually blend with darker metal, trim, and weathered exterior details.

Chem-Calk GPS1 Applications

• Flashing, soffit, fascia, and termination bar sealing.
• Exterior joints between dissimilar building materials.
• Construction and maintenance work needing a gun-grade polyurethane bead.
• Metal fabrication and building envelope repairs where bronze color is a fit.
• General exterior weather sealing where joint movement and adhesion are both required.

Standards and Use Notes

The published data lists ASTM C920 Type S, Grade NS, Class 25, Use NT, and Federal Specification TT-S-00230C Type II, Class A. Cure speed depends on temperature, humidity, joint depth, and bead size. Lower temperature and lower relative humidity can extend skin time and full cure.

Technical Details and Ordering

For related construction sealants, browse Chemical Concepts sealants. For manufacturer background on the Chem-Calk family, visit Bostik. Review the product data sheet before approving joint design, paint timing, or exposure conditions.

Need Help With Chem-Calk GPS1?

For help matching color, joint movement, and pack size, call (800) 220-1966 or email [email protected].