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A close view of ceramic glaze crazing. Crazing is the phenomenon that produces a network of fine cracks on the surface of a material, for example in a glaze layer. Crazing frequently precedes fracture in some glassy thermoplastic polymers. Crazing occurs in regions of high hydrostatic tension, or in regions of very localized yielding, which leads to the formation of interpenetrating microvoids and small fibrils. If an applied tensile load is sufficient, these bridges elongate and break, causing the microvoids to grow and coalesce; as
The difference in drying time can have a profound effect on the cured grout color. Self-spacing tile lugs-in the case of wall tile with the self-spacing lugs, the lugs cause the depth of the grout in the joint to differ from where there are no lugs.he different depths of the grout in the joints can cause a âshadowingâ effect where the self-spacing lug is almost visible beneath the installed grout. Conducting a test area will help to determine if color variation will occur due to the self-spacing lugs on the tile.