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glass hardness

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  • hardness tester — ▪ device       device that indicates the hardness of a material, usually by measuring the effect on its surface of a localized penetration by a standardized rounded or pointed indenter of diamond, carbide, or hard steel.       Brinell hardness is …   Universalium

  • glass — A transparent substance composed of silica and oxides of various bases. [A.S. glaes] cover g. a thin g. disk or plate covering an object examined under the microscope. SYN: coverslip. Crookes g. a spectacle lens combined with …   Medical dictionary

  • hardness — 1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion. SEE ALSO: h. scale, number. 2. The relative penetrating power of a beam of x rays, used both within the diagnostic range of …   Medical dictionary

  • glass-hard — ˈ ̷ ̷| ̷ ̷ adjective : having a maximum degree of hardness glass hard steel …   Useful english dictionary

  • Mohs hardness scale and observations on hardness of some additional materials — ▪ Table Mohs hardness scale and observations on hardness of some additional materials mineral Mohs hardness other materials observations on the minerals talc   1 very easily scratched by the fingernail; has a greasy feel gypsum   2 Mohs hardness… …   Universalium

  • Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …   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

  • Soda-lime glass — Soda lime glass, also called soda lime silica glass, is the most prevalent type of glass, used for windowpanes, and glass containers (bottles and jars) for beverages, food, and some commodity items. Also Pyrex brand kitchen glassware manufactured …   Wikipedia

  • Barcol hardness test — The Barcol hardness test characterizes the indentation hardness of materials through the depth of penetration of an indentor, loaded on a material sample and compared to the penetration in a reference material. The method is most often used for… …   Wikipedia

  • Knoop hardness — ▪ mineralogy       a measure of the hardness of a material, calculated by measuring the indentation produced by a diamond tip that is pressed onto the surface of a sample. The test was devised in 1939 by F. Knoop and colleagues at the National… …   Universalium

  • Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …   Wikipedia

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