Krystol Internal Membrane (KIM)

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Please Note: This product is only available from our Victoria, Calgary & Edmonton warehouses.

Krystol Internal Membrane (KIM) is a hydrophilic crystalline waterproofing admixture in dry powder form. KIM is used in place of externally applied surface membranes to protect concrete structures against moisture transmission, chemical attack and corrosion of reinforcing steel.

When combined with fresh concrete, Kryton’s unique and proven Krystol® technology reacts with un-hydrated cement particles to form millions of needle-like crystals. Over a period of weeks and months, these crystals grow, filling the naturally occurring pores and micro-cracks in concrete, and permanently blocking the pathways for water and waterborne contaminants. Later, if cracks form due to settling or shrinkage, incoming water triggers the crystallization process and additional crystals form, filling cracks and ensuring that the structure’s waterproofing barrier is maintained and protected.

In addition to filling the pores and capillaries of the concrete matrix with crystals, KIM enhances the natural hydration process by intensifying and prolonging the hydration of the cementing materials. This reduces the size and number of cracks and capillary pores within the concrete matrix, making it dramatically less porous, and improving strength and durability characteristics.

Product Features

  • KIM is a permeability reducing admixture for hydrostatic conditions (PRAH)

  • Replaces unreliable exterior membranes, liners and coatings

  • Easily added directly to ready-mix truck or at batch plant

  • Self-seals hairline cracks up to 0.5 mm (0.02 in.)

  • Reactivates in the presence of moisture

  • Effective against hydrostatic pressure up to 140 m (460 ft.) of head

  • Waterproofs from any direction (i.e. positive or negative side)

  • Impervious to physical damage and deterioration

  • Safe for contact with potable water, certified by NSF to NSF/ANSI Standard 61

  • Reduces concrete shrinkage and cracking

  • Provides excellent resistance to waterborne chemicals such as sulfates, chlorides, and acids

  • Compatible with self-compacting concrete (SCC)


  • Permanently waterproofs concrete

  • Protects concrete and reinforcement from harsh environments

  • Increases the durability and lifespan of concrete

  • Lowers the cost of waterproofing by up to 40%

  • Significant reduction to your construction schedule

  • Reduces the cost of maintenance and repairs

  • Increases revenues with a larger building footprint

  • Essential for blind-wall and shotcrete applications

  • Concrete Waterproofing Admixture