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Mohs scale of mineral hardness & Compressive strength

Categorie: Stone Crusher, Date: Sep 02, 2010

The Mohs scale of mineral hardness,  created in 1812 by the German mineralogist Friedrich Mohs, characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. 

The Mohs scale of mineral hardness is based on the ability of one natural sample of matter to scratch another. The samples of matter used by Mohs are all minerals which are pure substances found in nature. Rocks are made up of one or more minerals. As the hardest known naturally occurring substance when the scale was designed, dimands are at the top of the scale. The hardness of a material is measured against the scale by finore the hardest material that the given material can scratch, and/or the softest material that can scratch the given material. For example, if some material is scratched by apatite but not by fluorite, its hardness on the Mohs scale would fall between 4 and 5.

The Compressive strength is the capacity of a material to withstand axially directed pushing forces. When the limit of compressive strength is reached, materials are crushed. Concrete can be made to have high compressive strength, e.g. many concrete structures have compressive strengths in excess of 50 MPa, whereas a material such as soft sandstone  may have a compressive strength as low as 5 or 10 MPa.

By definition, the compressive strength of a material is that value of uniaxial compressive stress reached when the material fails completely. The compressive strength is usually obtained experimentally by means of a compressive test. The apparatus used for this experiment is the same as that used in a tensile test. However, rather than applying a uniaxial tensile load, a uniaxial compressive load is applied. As can be imagined, the specimen (Usually cylindrical) is shortened as well as spread lateraly.

The compressive strength of some of our products:

            Jaw crusher: <= 320MPa

            Impact crusher:<=360MPa

            Cone crusher :<=350MPa

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