Krystol Internal Membrane (KIM) is the world’s most trusted and original hydrophilic crystalline waterproofing admixture. First launched in 1980 by Kryton International Inc., KIM is used in the below-grade concrete during batching. The admixture enables the concrete to chemically react with water and unhydrated cement particles. This reaction forms needle-shaped crystals that grow deep within the concrete and resist water pressure, sealing capillary pores and micro-cracks. These crystals effectively block water and waterborne contaminants, creating a durable watertight barrier. 

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 upon 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. This self-sealing capability makes crystalline waterproofing a robust and lasting solution, providing a level of durability and longevity that traditional methods, reliant on surface or external membranes cannot match. 

In conclusion, integral crystalline waterproofing when mixed directly into concrete, transforms the concrete itself into a waterproof barrier, eliminating the need for external membranes. Since the waterproofing is embedded in the concrete, it ensures uniform coverage, including hard-to-reach areas. The self-sealing property guarantees long-term performance with minimal maintenance, providing significant advantages over traditional methods.