Sika Everbuild Puraflex 25 One-Part Low Modulus Polyurethane Sealant White 300ml

Summary

Sika Everbuild Puraflex 25 is a premium quality, one-part low modulus building sealant based on polyurethane technology, formulated to replace conventional polysulphide sealants across most construction applications. Solvent free and odourless, it bonds to the widest range of building substrates and remains permanently flexible to accommodate joint movement. It is the go-to choice for contractors sealing expansion, dilation, and perimeter joints on both new build and refurbishment projects.

Features

• One-part polyurethane formulation cures to a durable, permanently flexible seal that accommodates significant joint movement.
• Adheres to most building surfaces including concrete, ceramics, timber, metal, and uPVC without the need for specialist primers on most substrates.
• Solvent free and odourless formula, making it suitable for use in occupied or poorly ventilated areas.
• Overpaintable once cured - a preliminary adhesion test is recommended before painting.
• Certified non-staining on marble to ISO 16938-1 and ASTM C 1248, making it safe for use on sensitive stone surfaces.
• Excellent UV and pollution resistance for long-term performance in exposed exterior locations.
• Suitable for both vertical and horizontal joints, including light-traffic floor joints.
• Conforms to EN 15651-1 type FEXT-INT CC Class F25LM, ISO 11600 F25LM, and ASTM C920 Class 100/50.

Specifications

• Colour: White
• Volume: 300ml cartridge
• Technology: One-part polyurethane
• Modulus: Low modulus (LM)
• Movement Accommodation (butt joints): +/-25% (50% total)
• Movement Accommodation (lap joints): +/-50% (100% total)
• E-Modulus: 0.3 N/mm2 @ 23degC (ISO 8339)
• Slump (ISO 7390): Nil
• Standards: EN 15651-1 F25LM, ISO 11600 F25LM, ASTM C920 Class 100/50

What's Included

• 1 x 300ml cartridge of Puraflex 25 White Sealant