This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.

Koster PU-Flex 25
Koster PU-Flex 25 is a highly elastic, one component, low modulus polyurethane joint sealant.
Koster PU-Flex 25 is a remarkable sealant used for between concrete, mortar, brickwork, natural and synthetic stone, metal, steel, aluminium, wood, ceramic tiles and rigid plastics.
Koster PU-Flex 25 is one component and cures with moisture to form a flexible sealant which can be overpainted after curing is finished.
This unique sealant is highly thixotropic with positive workability.
Enquire about this product
- Application
- Product Details
- Downloads
- Technical Drawings
- Highly elastic
- Non-sagging
- Good workability
- Environmentally Friendly
- Seamless Application
- Easy smoothing
- Highly thixotropic
- hot temperatures shorten curing time of material
- Good UV Resistance
- Excellent adhesion to typical construction materials
- Easy application using a silicone gun
- Polyurethane based
Straight after used clean tools/machinery polyurethane solvent.
Low temperatures lengthen curing time.
Koster PU-Flex 25 Contains isocyanates, avoid direct skin/eyes contact. If contact does occur rinse area well with clean water and soap, then seek medical advice.