Koster PUR Gel – Water Activated Polyurethane Gel
Koster PUR Gel is a solvent-free, water activated polyurethane gel. Depending on the amount of water added, a highly elastic, waterproof gel or respectively hydro-gel foam is formed. After it has reacted in dilutions up to 1:10, it is resistant to pressurized water. It does not contain free isocyanides and is chemically stable after reacting. It does not contribute to corrosion. Koster PUR Gel reacts with water and can bind up to ten times its own weight in water. Oakum soaked in Koster PUR Gel can be an elegant method for solving difficult active water ingress problems in pipes, joints, and cavities. It is often used where large amounts of free water must be bound.
Fields of Application
PUR Gel is intended for waterproofing below ground structural elements through area injection in highly porous, jointed and cracked building materials, and for waterproofing dilation and expansion joints as well as for the sealing of cavities, waterproofing pipe couplings, pipe and cable penetrations, joints in masonry, concrete and soils. The material is specifically used as waterproofing in permanently moist environments. In other cases protect from drying out.
Depending on field of application:
- Area injection with a mixing ratio of 1:13 approx. 2 kg / m²
- Expansion joints with a mixing ratio of 1:10 approx. 3 kg / litre
The mixing ratio is adjusted according to the amount of water in the material. The more water present, the less water is given to the mixing ratio. Changing mixing ratios during the course of injection are to be allowed for.
The application of the material is generally carried out with a two component pump such as the Koster Gel Pump. Koster Distributor Lances or Koster Lamella Packers are recommended.