Fosroc Nitoseal PU40 CS, Polyurethane Sealant for Movement Joints - White

Fosroc Nitoseal PU40 CS White is a polyurethane-based elastomeric sealant designed for waterproofing and sealing joints in civil engineering concrete structures and metal elements. It adheres well to concrete, metal, wood, and asphalt, offers weathering and UV resistance, and is suitable for both indoor and outdoor applications, providing a durable, flexible barrier against water ingress and substrate movement.

The technical specification describes it as a single-component polyurethane sealant that cures in place and is ready to use. Some marketing materials may mention a two-component option, but the official spec indicates it is single-component and does not require mixing.

It bonds well to concrete and many common construction substrates, including metal, wood, asphalt, brick and primed or painted surfaces. In most cases primers are not required, provided the surface is clean, dry and sound.

It is elastomeric with a low modulus, providing good elongation and ability to accommodate substrate movement. It offers excellent adhesion, UV/weather resistance, and forms a waterproof barrier. It also delivers good chemical resistance in harsh environments and provides a smooth finish with minimal staining or abrasion.

Prepare the joint by cleaning it thoroughly and ensuring it is dry. Load the product into a standard caulking gun and extrude it into the joint, then tool with a spatula or similar tool to achieve a neat, continuous seal. The product is described as ready-to-use and can be installed with simple tools.

Primers are typically not required for sound concrete, metal, or masonry substrates. Use mild cleaners to prepare the surface if needed, and ensure it is clean, dry and free of oil or grease prior to application.

The product is described as fast-curing with low odor. Curing time depends on temperature and humidity; higher temperatures and adequate moisture typically accelerate cure. Joint performance improves as curing progresses over hours to days depending on conditions.

Yes. It is formulated for outdoor weather exposure and indoor use, maintaining elasticity and adhesion across temperature ranges suitable for both environments.

Use appropriate personal protective equipment such as gloves and eye protection. Ensure good ventilation during application and curing. Avoid skin and eye contact with uncured material, and refer to the Safety Data Sheet (SDS) for handling and first-aid guidance.

Common applications include waterproofing and sealing expansion joints in concrete structures, joints between metal elements and concrete, window/door frames, precast panels, and other situations requiring a flexible, durable waterproof seal that accommodates movement.

Compared to Fosroc Nitoseal PU40 CS Grey (URL: https://fepy.com/product/fosroc-nitoseal-pu40-cs-grey), the performance is similar with the main difference being color; both share the same formulation and adhesion properties. Compared to Fosroc Nitoseal MS (URL: https://fepy.com/product/fosroc-nitoseal-ms), the MS variant is an MS-polymer sealant, which may differ in flexibility, cure mechanism, and substrate compatibility. Choose based on color requirement and substrate conditions.

Store in the original, unopened packaging in a cool, dry place away from direct sunlight and extreme temperatures. Avoid freezing. Shelf-life is typically around 12 months when stored properly, but always verify on the product label and SDS for the exact batch information.