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Crazing is a spider web pattern of cracks penetrating the glaze. It is caused by tensile stresses greater than the glaze is able to withstand. [1] [2] Common reasons for such stresses are: a mismatch between the thermal expansions of glaze and body; from moisture expansion of the body; and in the case of glazed tiles fixed to a wall, movement of the wall or of the bonding material used to fix ...
These deliberate glazing effects are usually known as "crackle", with crackle[d] glaze or "crackle porcelain" being common terms. It is typically distinguished from crazing , which is accidental craquelure arising as a glaze defect , although in some cases, experts have difficulty in deciding whether milder effects are deliberate or not. [ 10 ]
Crackle glaze A glaze intentionally crazed (minute cracks) for decorative effect. Crawling A parting and contraction of the glaze on the surface of ceramic ware during drying or firing, resulting in unglazed areas bordered by coalesced glaze. May be caused by uneven glazing, excessive glaze thickness or a greasy substrate. [8] Crazing
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Crazes in polystyrene (PS). Crazing is a yielding mechanism in polymers characterized by the formation of a fine network of microvoids and fibrils. [1] [2] These structures (known as crazes) typically appear as linear features and frequently precede brittle fracture.
There is a definite market for those willing to pay a premium for made-to-order pieces with authentication certificates. Most is sold overseas because the pieces fetch a much higher price. Clients can come simply to order an entire set of dishes or tiles to put on buildings back to their home countries. [64] House covered in Puebla tile