Koster PU 907 Polyurethane Sealant

Koster PU 907 is a highly elastic, low modulus polyurethane sealant, with good UV resistance and excellent adhesion to typical construction materials.

Koster PU 907 is designed for civil and industrial movement, expansion, control and dilatation joints in architectural and heavy construction. An ideal sealant for use between concrete, mortar, brickwork, natural and synthetic stone, metal, steel, aluminium, wood, ceramic tiles and rigid plastics.

Koster PU 907 is a one component sealant that cures with moisture to form a flexible finish which can be overpainted after curing is finished. The sealant is non-sagging, highly thixotropic, offers easy smoothing and has good workability.

  • Application of Koster PU 907 is carried out by a suitable press-out gun
  • For application to damp surfaces where other paints Cannot adhere

Koster PU 907 is used as part of the Delta Cavity Drainage System and Koster NB 1 twin waterproofing system to provide a waterproof and vapour resistent seal of the Delta Qwikseal plug through the primary NB 1 waterproof coating, providing continuous waterproofing for the NB 1 and Delta Cavity Drain System.

Koster PU 907 is the perfect solution for:

  • Expansion Joints
  • Joint filling between differing substrates
  • Sealing around fixings
Ancillary Products

We recommend:

Koster NB 1


Contains isocyanates.  Avoid contact with skin and eyes. Wear suitable protective clothing, gloves and eye/face protection. After contact with skin, wash immediately with plenty of water and soap. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. For additional references to safety-hazard warnings, regulations regarding the transport and waste management please refer to the relevant Material Safety Data Sheet.

If you'd like more information on any of our products, call 01992 523 523 today to speak to one of our experts