Krystol Internal Membrane (KIM) is a hydrophilic crystalline admixture used to create permanently waterproof concrete. KIM contains Krystol Technology, which when added to water, reacts with water and un-hydrated cement particles to form insoluble needle-shaped crystals. The crystals fill pores and micro-cracks to block the pathways of water. Any moisture introduced over the lifespan of concrete will initiate crystallization, ensuring permanent self-sealing.
KIM is used in place of surface applied membranes because it stops the transmission of water through concrete. By eliminating exposure to waterborne contaminants, KIM protects concrete from chemical attack and prevents corrosion of reinforcing steel. KIM is also a LEED eligible additive that enhances the durability and longevity of a concrete structure.