General FAQ

  1. Can Xypex be used against extreme hydrostatic pressure? READ
    Yes. Because Xypex is not dependent upon adhesion to the concrete surface and, instead, becomes an integral part of the concrete mass, it is capable of resisting extreme hydrostatic pressure from either side (positive or negative) of the concrete. Independent laboratory testing in accordance with U.S. Army Corps of Engineers CRD C-48-73 “Permeability of Concrete” showed that Xypex-treated concrete withstood up to 405 feet (123.4 m) of head pressure (175 psi/1.2 MPa), the limit of the testing apparatus.

  2. Does Xypex have any adverse effect on concrete? READ
    No. The Xypex crystalline formation becomes a part of the concrete matrix itself and has no deleterious effect on the concrete. In fact, independent laboratory testing has shown that under most conditions Xypex enhances the strength and durability of the concrete structure.

  3. Does Xypex protect concrete against freeze/thaw damage? READ
    Yes. By blocking the intrusion of water into concrete, Xypex helps protect the concrete from the damaging effect of repeated freeze/thaw cycles.

  4. Does Xypex protect reinforcing steel? READ
    Yes. By preventing the intrusion of water, salt water, sewage, and most chemicals, Xypex helps protect reinforcing steel against oxidation and deterioration.
  5. How is Xypex different from other products? READ
    The Xypex crystalline system for concrete waterproofing and protection is substantially different from traditional barrier products (membranes, cementitious coatings, etc): 

    • Xypex 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 concrete.
    • Because Xypex is not dependent on surface adhesion to achieve its waterproofing effect, it is resistant to extreme hydrostatic pressure.
    • Xypex will seal hairline cracks up to 0.4 mm (1/64”).
    • Xypex is not subject to the deterioration problems encountered by membranes.
    • Xypex is designed to be permanent and reactivates whenever water is present. 
  6. How long does Xypex last? READ
    The Xypex treatment, unlike most other systems, becomes a permanent part of the concrete matrix. Its unique dendritic crystalline growth will not deteriorate under normal conditions, and the crystalline process will reactivate whenever water is present.

  7. In what forms is the Xypex Crystalline Technology available? READ
    The Xypex crystalline technology is available in three forms: 

    1. As a Coating System (Xypex Concentrate & Modified) for new or existing structures
    2. As a Concrete Additive (Xypex Admix C-Series) to be added at time of concrete batching
    3. As a Dry Shake material (Xypex DS-1 & DS-2) for fresh horizontal surfaces

    These three options will prove an asset to the value-engineering process and to the flexibility of the construction schedule.
  8. Is Xypex resistant to aggressive chemicals? READ
    Based on independent testing according to ASTM C 267-77 “Chemical Resistance of Mortars”, the Xypex coating is not affected by a wide range of aggressive chemicals including mild acids, solvents, chlorides and caustic materials. Because Xypex is pH specific (not chemical specific) it will protect concrete from any chemical whose pH range is 3.0 to 11.0 constant contact, or 2.0 to 12.0 periodic contact.
  9. Is Xypex toxic? READ
    No. Xypex contains no volatile organic carriers (VOC) and can be applied safely in enclosed surroundings. Xypex is approved by numerous health and waterworks departments around the world for use on structures that contain potable water or foodstuffs. A few of these agencies are: 

    NSF International
    Swiss Federal Department of Health
    Japan Food Research Laboratories
    United Kingdom (DWI) Drinking Water Inspectorate
    Australian Water Quality Centre
    Singapore Institute of Standards and Industrial Research
    France Research Centre for the Control of Water
    Czech Republic Health Institute & Centre for Drinking Water
  10. Is Xypex used to waterproof cracks, faulty joints and other defects in concrete? READ
    Yes. Xypex has a specific repair system that utilizes its unique crystalline waterproofing technology to stop water flow through cracks, faulty joints and other defects. In the case of expansion joints or chronic moving cracks, a flexible sealant is recommended.
  11. What are some typical Xypex applications? READ
    Typical Xypex applications include:

    • reservoirs 
    • sewage and water treatment tanks 
    • secondary containment structures
    • tunnels
    • underground vaults
    • manholes
    • concrete pipe
    • foundations pools
    • parking structures
    • below grade construction

  12. What makes Xypex unique? READ
    Xypex becomes an integral part of the concrete mass itself. Traditional barrier products, on the other hand, rely solely on their performance at the surface of the concrete and are therefore subject to deterioration caused by exposure to the environment, hydrostatic pressure, puncturing, delamination, chemical erosion, and damage during backfilling. Xypex was developed to eliminate these very issues. The Xypex formula is based on the natural characteristics of concrete – the fact that concrete is both porous and chemical in nature. With moisture as the catalyst, Xypex’s proprietary chemicals react with the products of cement hydration to form a non-soluble complex within the pores, voids and capillary tracts of the concrete mass. From this inside position, Xypex renders the concrete impenetrable by water and other liquids from any direction, eliminates the problems normally associated with traditional barriers and, in the process, enhances the quality and durability of the concrete structure.