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Stone hardness measurement method

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Stone hardness is usually divided into relative hardness and absolute hardness.


Relative hardness: the choice of 10 kinds of minerals as the standard, according to their relative hardness of the size of 10. The relative hardness is formulated by the mineralogist Moore, so called the Mohs hardness. Mohs hardness is not strict quantitative criteria, so are rarely applied to the performance analysis of the stone, but because the Mohs hardness is easy to use, so the lack of special equipment available to roughly determine the type of rock or mineral species. For example the Mohs hardness of iron for 5 ~ 5.5, so with a knife is not in granite carved traces of, and in the marble mineral hardness mostly less than 4, can be a knife to the ruling, so with a knife can distinguish the stone rock types.


Absolute hardness: absolute hardness is determined by the use of hardness meter. According to the method of the measurement, the load can be divided into static and dynamic hardness. The static hardness and Knoop hardness and hardness of Vivtorinox, HK and HV respectively represented by the symbol. Dynamic hardness is also known as Shaw's hardness, with the symbol HS said. Stone is a brittle material, which is more suitable for the determination of the hardness of stone by using the shore hardness tester. Usually a marble shore hardness between 35 to 55, shore hardness of granite usually between 70 to 95, and some can be up to more than 110.

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