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Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone. Similar to carnelian is sard , which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.
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Durometer, like many other hardness tests, measures the depth of an indentation in the material created by a given force on a standardized presser foot. This depth is dependent on the hardness of the material, its viscoelastic properties, the shape of the presser foot, and the duration of the test. ASTM D2240 durometers allow for a measurement ...
ISO 3737:1976 Agricultural tractors and self-propelled machines — Test method for enclosure pressurization systems [Withdrawn: replaced with ISO 14269-(1-5)] ISO 3738 Hardmetals — Rockwell hardness test (scale A) ISO 3738-1:1982 Part 1: Test method; ISO 3738-2:1988 Part 2: Preparation and calibration of standard test blocks
The Knoop hardness test; Other hardness scales. Hardness scales may also refer to: Methods of measuring the deposit formation by hard water. The scale of Pencil hardness
Vickers test scheme An indentation left in case-hardened steel after a Vickers hardness test. The hardness of a material is directly related to its incompressibility, elasticity and resistance to change in shape. A superhard material has high shear modulus, high bulk modulus, and does not deform plastically. Ideally superhard materials should ...
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