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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
For glaze firing at low temperatures, tiles can be put into many types of tile setters. But if you are using high fire clay and firing it to maturity, the tiles will slump at high temperatures. In these cases you have to fire the tiles on a flat surface. Fire tiles on a kiln shelf dusted with silica sand. This allows the tiles to move easily on the shelf, as they expand and shrink from the heat. Make a moat around your tiles by putting bars of clay around their edges.