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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 ]
Crackled glass was glass filled with webs of small cracks and fissures, refracting light and causing the glass to have a sparkling effect. [1] Émaux-Bijoux was a technique invented by Emile Gallé. Translucent layers of enamel were built up in layers and then fused to a foil of precious metal, which was then heated and attached to the outside ...
Glazing of pottery followed the invention of glass around 1500 BC, in the Middle East and Egypt with alkali glazes including ash glaze, and in China, using ground feldspar. By around 100 BC lead-glazing was widespread in the Old World. [3] Glazed brick goes back to the Elamite Temple at Chogha Zanbil, dated to the 13th century BC.
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.
A flat crackle tube is featured as part of a prop representing Star Trek's Borg on display at the Hollywood Entertainment Museum. Typically, crackle tubes are cylindrical, however, they can be made into virtually any shape, even flat plates (trademarked by the name "Luminglas" [1]). The filaments can also be made to any color by combining ...
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