Koster 21 is a 2-component, solvent-free, liquid applied, elastic, crack bridging waterproofing material that provides excellent adhesion to dry and moist substrates. 

Features and benefits

  • Liquid-applied - it is seamless, easing application to complicated architectural details.

  • UV stable - suitable for indoor and outdoor use.

  • Its white color reflects sunlight and reduces building surface temperatures.

  • Highly flexible fast curing coating - resistant to occasional foot traffic, aging, hydrolysis, UV rays, frost, and salt.

  • Bonds well to a wide variety of substrates, including masonry, concrete, screed, PVC, metal, and bitumen.

  • Seals against synthetic oils and aliphatic hydrocarbons with high boiling points (up to 2 bar).

  • Not resistant against substances with high aromatic hydrocarbon contents such as benzene, xylene, toluene, etc.

  • Does not contain volatile organic compounds (VOC content = 0), is free of polyurethanes, isocyanates, and bitumen.

Applications

Koster 21 is a waterproofing material for the positive side waterproofing of basements, concrete slabs, in tanks, on flat roofs, underneath tiles, on terraces or balconies, and similar applications.

It is also suitable as a protective coating against mineral oils and aliphatic hydrocarbons.

Koster 21 can protect surfaces in facilities with chemical and mechanical demands on the coatings, such as containment and skimming tanks.  

Specification

  • Product code: DMS244

  • Size: 20kg

  • Coverage rate: 2.5kg/m² = 8m²