Polyurethane Sealants

Polyurethane sealants are widely used for movement joints, façade sealing, precast concrete, masonry connections and other construction details where the joint must remain flexible after cure. Adheseal's polyurethane sealant range includes products from Adheseal, Everflex, Sika and Bostik for general construction, civil work, fire-rated joints, automotive sealing and combined bonding-and-sealing applications.

Polyurethane sealant for expansion and construction joints

A polyurethane joint sealant is designed to accommodate movement while maintaining adhesion to the joint faces. Typical applications include precast and tilt-up panels, concrete and masonry façades, window and door perimeters, pavement joints and general building connections. Products such as Adheseal PU15, PU25, PU50 and Megaprene 40GG cover different movement, hardness and service requirements, so the correct product should be selected from the technical data rather than by chemistry alone.

Sikaflex and Bostik PU sealants

The range also includes Sikaflex polyurethane sealants for façade, construction and combined adhesive-sealant applications. Sikaflex PRO is available in cartridge and sausage formats, while Sikaflex Construction AP+ is intended for movement and connection joints on common construction substrates. Sikaflex 11 FC+ combines sealing with bonding capability for compatible substrates.

Bostik Seal N Flex P390 and P590 provide polyurethane joint-sealing options across cartridge and sausage packaging. Fireban One covers fire-rated and acoustic joint applications where the complete tested system requires a fire-resistant sealant. Packaging size does not change the underlying product selection criteria, but it can affect application equipment and site productivity.

Adhesive-sealants and specialist applications

Some polyurethane products can both bond and seal. Everflex PU240, PU50 and Sikaflex 11 FC+ are examples where the product may be selected for flexible bonding as well as joint sealing. Automotive products such as Sikaflex 227 are designed around vehicle body seams and panel sealing rather than building expansion joints.

Before ordering a PU sealant, check joint movement requirement, substrate compatibility, primer guidance, joint width and depth, cure speed, paintability, water or chemical exposure and any required certification. Correct backing material and joint geometry are also essential to long-term sealant performance.

For timber bonding, structural joinery or windscreen installation where the primary function is adhesion rather than joint movement, browse our dedicated Polyurethane Adhesives collection.