Mapei Low-Modulus PU Sealant, 600ml, Used for Flexible Joints in Concrete Floors and Car Parks - S25 Grey

Mapeflex PU S25 can be applied to a wide range of common construction substrates such as concrete, brick, masonry, plaster, stone, metal, tile, glass, and timber, provided the surfaces are clean, dry, and free of dust, grease, and loose parts. Always perform a small test to confirm adhesion on the specific substrate.

Mapeflex PU S25 is designed to be elastic and highly resistant to movement. It maintains a strong bond and seals effectively even with minor surface movement, making it well-suited for expansion joints and joints exposed to thermal cycling and structural movements.

Key specs: color is grey, cartridge size is 600 ml, one-component polyurethane sealant, high elasticity and durability, stain-absorption properties to act as a protective barrier, and a simple application profile that requires no special tools beyond a standard caulking gun.

1) Clean and dry the joint area. 2) Cut the nozzle to the desired bead size and load the cartridge into a caulking gun. 3) Apply a steady, continuous bead along the joint. 4) Tool the sealant with a wet finger or appropriate tooling tool to achieve a smooth finish. 5) Remove excess material and allow it to cure in a well-ventilated area. Avoid applying on frozen surfaces or when temperatures are outside recommended ranges.

In many cases Mapeflex PU S25 can be applied directly to clean, dry substrates without a primer. However, substrate compatibility can vary by material and condition. Always test adhesion on the specific substrate and follow the product’s guidelines for priming if required.

Tool the sealant soon after application to ensure a uniform, smooth finish. Use a damp tool or finger to press the sealant into the joint and achieve crisp edges. Remove any excess material promptly to prevent staining or uneven surfaces.

Use PPE such as gloves and eye protection in a well-ventilated area. Avoid skin or eye contact and avoid inhaling fumes. Keep away from sources of ignition before curing. Follow the safety data sheet and product instructions for storage and handling.

Mapeflex PU S25 offers strong adhesion, high elasticity, and durability suitable for joints that move. It is designed for exterior and interior use with good resistance to weathering. For a direct contrast on Fepy, you can compare it with Mapeflex PU S25 Beige 600ml, which shares the same formulation in a different color: https://fepy.com/product/mapei-mapeflex-pu-s25-beige-600ml

Polyurethane sealants like Mapeflex PU S25 generally offer superior adhesion to a wider range of substrates and higher elasticity for joints that experience movement, compared with many silicone sealants. This makes PU S25 a strong choice for exterior joints and substrates prone to movement, though silicone can be preferable for certain non-porous surfaces and for glazing applications.

Mapeflex PU S25 Grey combines strong adhesion, excellent elasticity, durability, and stain resistance in a single-component sealant. Its 600 ml cartridge provides substantial coverage for continuous joints, reducing the need for frequent re-sealing and offering long-term protection for occupied or exposed building joints.

The 600 ml cartridge includes the polyurethane sealant ready for immediate use with a standard caulking gun. After opening, reseal promptly with its cap or nozzle to prevent skin formation. Store in a cool, dry place away from heat and direct sun, following the product’s shelf-life guidance.