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Thread: Porcelanas

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    Porcelanas

    Porcelain

    Porcelain is a ceramic material made by heating raw materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 C (2,192 F) and 1,400 C (2,552 F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures.
    Porcelain derives its present name from old Italian porcellana (cowrie shell) because of its resemblance to the translucent surface of the shell. Porcelain can informally be referred to as "china" or "fine china" in some English-speaking countries, as China was the birthplace of porcelain making. Properties associated with porcelain include low permeability and elasticity; considerable strength, hardness, toughness, whiteness, translucency and resonance; and a high resistance to chemical attack and thermal shock.
    For the purposes of trade, the Combined Nomenclature of the European Communities defines porcelain as being "completely vitrified, hard, impermeable (even before glazing), white or artificially coloured, translucent (except when of considerable thickness), and resonant." However, the term porcelain lacks a universal definition and has "been applied in a very unsystematic fashion to substances of diverse kinds which have only certain surface-qualities in common" (Burton 1906).


     



  2. 09-24-2012, 01:40 PM

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    SUPERBE!
    ELISA DRAGA,
    SINCERE FELICITARI! PENTRU MUNCA TA ASIDUA SI GENEROZITATEA CU CARE NE PUI SI NOUA LA DISPOZITIE NEBANUITE COMORI DE FRUMUSETE.
    Mariana Cardei

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    Excellent work, I have been looking forward to your release of this for a while

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