Krystol Internal Membrane™ (KIM®)

The Kryton Krystol Internal Membrane (KIM) product is a hydrophilic crystalline admixture used to create permanently waterproof concrete.

KIM lowers the permeability of concrete, and is used in place of surface applied waterproofing membranes. By stopping the transmission of water through concrete, KIM adds durability and longevity to concrete by protecting it against chemical attacks and corrosion of reinforcing steel.

How it works

When KIM is added to concrete, the Kryton Krystol technology chemically reacts with water and un-hydrated cement particles to form insoluble needle-shaped crystals that fill capillary pores and micro-cracks in the concrete and block the pathways for water and waterborne contaminants.


Any moisture introduced over the lifespan of the concrete will initiate crystallization, ensuring permanent waterproofing protection.

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Features and Benefits

  • Lowers the cost of waterproofing concrete
  • Helps to shave weeks off construction schedules
  • Reduces the cost of maintenance and repairs
  • Increases reliability and quality control
  • Increases revenues with a larger building footprint
  • Safe for contact with potable water and Certified by NSF to NSF/ANSI Standard 61 Drinking Water System Components
Image of Krystol Internal Membrane™ (KIM®)
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Overview Pool

KIM is recommended for all concrete that will be subject to water pressure and can be used in precast, cast-in-place and shotcrete applications.

  • Below grade parking
  • Basements
  • Sewage plants
  • Swimming pools
  • Dams
  • Foundation walls
  • Footings
  • Slabs


  • 5 kg resealable pails
  • 25 kg resealable pails
  • Mixer Ready bags in custom sizes to match your mix design

Dosage: KIM is dosed at 2% of cementing materials by weight, to a maximum dosage of 8 kg/m³.

Coverage: 1m³ per 5 kg KIM

Contact Us Today
+27 (011) 425 3061 7 Hills Street, Rynfield
Benoni, 1501
South Africa

Company Reg: 1992/009387/23