Xypex Crystalline Technology can be found deep within the concrete, at the microstructure level. It is here that the Xypex proprietary chemicals react with the natural byproducts of cement hydration to prevent ingress from water and other harsh, corrosive liquids. With water as the catalyst, Xypex forms a non-soluble crystalline structure within the interconnected pores of the concrete and becomes a permanent part of the concrete matrix, providing unmatched protection from within the concrete structure. Developed in the lab and perfected through decades of continuous research and improvements, waterproofing by crystallization revolutionized concrete sealing, which had traditionally been a surface-level approach. The Xypex crystalline system for concrete waterproofing is substantially different from traditional barrier products — like membranes and cementitious coatings. The concrete waterproofing system creates a crystalline structure deep within the pores and capillary tracts of the concrete mass to prevent the penetration of water and aggressive chemicals. In contrast, barrier-type products function only at the surface of the concrete Because it is not dependent on surface adhesion to achieve its cement waterproofing effect, it is resistant to extreme hydrostatic pressure