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How Xypex® Works
Crystallization Process
When mixed with water and applied as a cementitious coating, the active chemicals in
Xypex cause a catalytic reaction which generates a non-soluble crystalline formation of
dendritic fibers within the pores and capillary tracts of concrete. This process permanently
seals the concrete against the penetration of water or liquids from any direction.
The process by which Xypex waterproofs concrete is unique, in that Xypex is a catalyst.
This crystalline growth is highly resistant to extreme water pressure from either side of
the concrete and also to most aggressive chemicals. Since the process is catalytic, the
crystalline structure can reactivate many years after the original application, to seal
or re-seal many defects which might occur in the concrete at a later time.
The crystallization process that Xypex causes within the pores and capillary tracts of
concrete is illustrated below in electron microscope photos taken by an independent
research team.
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1. Concrete (untreated)
A control sample of concrete was sheared through at 50mm below the top surface.
The sheared face shows some of the by-products of cement hydration with which
Xypex reacts. Precipitated calcium hydroxide together with cubic and rhombic
particles are visible.
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2. Xypex crystallization (initiation)
Taken at 50mm within a Xypex-treated concrete sample, This photograph shows the
initiation of the Xypex crystalline reaction after Xypex Concentrate was applied
to the surface.
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3. Xypex crystallization (mature)
This photo was taken 26 days after the application of Xypex Concentrate at a
depth of 50mm into the concrete sample. A dense, fully developed crystalline
structure has formed within the capillary tracts of the concrete to completely
block the flow of water.
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Click here for answers to other frequently asked questions about Xypex.
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