fused magnesia

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• magnesium processing — Introduction       preparation of the ore for use in various products.       Magnesium (Mg) is a silvery white metal that is similar in appearance to aluminum but weighs one third less. With a density of only 1.738 grams per cubic centimetre, it… …   Universalium

• glass — glassless, adj. glasslike, adj. /glas, glahs/, n. 1. a hard, brittle, noncrystalline, more or less transparent substance produced by fusion, usually consisting of mutually dissolved silica and silicates that also contain soda and lime, as in the… …   Universalium

• Glass — /glas, glahs/, n. 1. Carter, 1858 1946, U.S. statesman. 2. Philip, born 1937, U.S. composer. * * * I Solid material, typically a mix of inorganic compounds, usually transparent or translucent, hard, brittle, and impervious to the natural elements …   Universalium

• chromium processing — Introduction       preparation of the ore for use in various products.       Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857° C (3,375° F) and boils at 2,672° C (4,842° F). In the pure state, it is resistant to ordinary… …   Universalium

• Magnesium — Not to be confused with Manganese. sodium ← magnesium → aluminium Be ↑ Mg ↓ Ca …   Wikipedia

• refractory — refractorily, adv. refractoriness, n. /ri frak teuh ree/, adj., n., pl. refractories. adj. 1. hard or impossible to manage; stubbornly disobedient: a refractory child. 2. resisting ordinary methods of treatment. 3. difficult to fuse, reduce, or… …   Universalium

• Roman glass — objects have been recovered across the Roman Empire in domestic, industrial and funerary contexts. Glass was used primarily for the production of vessels, although mosaic tiles and window glass were also produced. Roman glass production developed …   Wikipedia

• industrial glass — Introduction       solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …   Universalium

• Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …   Wikipedia

• manganese processing — Introduction       preparation of the ore for use in various products.       Manganese (Mn) is a hard, silvery white metal with a melting point of 1,244° C (2,271° F). Ordinarily too brittle to be of structural value itself, it is an essential… …   Universalium

• Characteristics of oxide glasses — ▪ Table Characteristics of oxide glasses fused silica soda lime silica borosilicate aluminosilicate lead Approximate composition1 ● silica 99.9% ● water 0.1% ● silica 73% ● alumina 1% ● sodium oxide 17% ● magnesia 4% ● lime 5% ● silica 81% ●… …   Universalium