Krystol Internal Membrane (KIM)

First launched in 1980 by Kryton International Inc., KIM is dosed into below-grade concrete during batching. The admixture reacts with water and unhydrated cement particles to form needle-shaped crystals that grow deep within the concrete, sealing capillary pores and micro-cracks and resisting water pressure.

One of the significant features of integral crystalline waterproofing is its self-sealing ability. If and when new cracks form over time, the crystalline structures reactivate on contact with water and expand until the path of water or moisture is blocked — protecting concrete from chemical attack and reinforcing steel corrosion, and minimising repair costs.

Because the waterproofing is embedded in the concrete, it ensures uniform coverage including hard-to-reach areas, eliminating the need for external membranes. The self-sealing property guarantees long-term performance with minimal maintenance, providing significant advantages over traditional methods reliant on surface or external membranes.

Key benefits

Self-sealing for life	When new cracks form, the crystalline structures reactivate on contact with water and expand until the path is blocked.
Protects reinforcement	Blocks water and waterborne contaminants, guarding against chemical attack and rebar corrosion.
Uniform coverage	Embedded in the concrete itself, so hard-to-reach areas are protected without external membranes.
Independently certified	Backed by NSF, CE, ASTM, ICC-ES and BBA approvals — proven, not just claimed.