Polyurethane sealants

PU joint sealant or polyurethane sealant, is one of the most versatile sealant types. In addition to its durability and strength, it adheres to most substrates. PU sealant lasts longer than a silicone sealant and also remains stable in terms of strength over its lifetime. Thanks in part to its very high adhesion, tensile strength and paintability, this is by far the most versatile sealant. Isocyanate is used in the manufacture of PU sealants. The professional processor receives specific training for this from the industry.

You can use this sealant to seal joints and seams in concrete and stone. Thanks to its good water and chemical resistance, this sealant is suitable for everything that comes into contact with water such as water treatment plants, sewers, ponds and swimming ponds. The polyurethane sealant is therefore highly resistant to seawater, fertilizers, weak acids and alkalis and fecal matter.

Application of PU sealants

• In construction, you can apply them for filling joints of windows, doors and walls.


• For floor joints in parking garages or in floor tiles.


• For prefabricated building elements and cast floors or as a gasket-seal in tanks and silos.


• For bonding profiles and panels in bodywork construction.


• For jointing teak to a boat deck.

Advantages of PU

• Excellent adhesion on various substrates
• Suitable for indoor and outdoor applications
• Water and chemical resistant
• Long life span
• High elasticity, up to 20%

Disadvantages of PU

• Does not adhere to damp surfaces
• Sometimes necessary to apply a primer
• Contains isocyanates
• Special training required as of 2023