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2. Category:Hardness tests - Wikipedia

   en.wikipedia.org/wiki/Category:Hardness_tests

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

3. Carnelian - Wikipedia

   en.wikipedia.org/wiki/Carnelian

   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.

4. Scleroscope - Wikipedia

   en.wikipedia.org/wiki/Scleroscope

   A scleroscope is a device used to measure rebound hardness.It consists of a steel ball dropped from a fixed height. The device was invented in 1907. As an improvement on this rough method, the Leeb Rebound Hardness Test, invented in the 1970s, uses the ratio of impact and rebound velocities (as measured by a magnetic inducer) to determine hardness.

5. List of ISO standards 3000–4999 - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_standards_3000...

   ISO 3737:1976 Agricultural tractors and self-propelled machines — Test method for enclosure pressurization systems [Withdrawn: replaced with ISO 14269-(1-5)] ISO 3738 Hardmetals — Rockwell hardness test (scale A) ISO 3738-1:1982 Part 1: Test method; ISO 3738-2:1988 Part 2: Preparation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

6. Superhard material - Wikipedia

   en.wikipedia.org/wiki/Superhard_material

   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 ...

7. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .