So, what is the index
Can the natural stone reach the standard?
Physical performance indicators for qualified marble
The volume density of more than 2.6g/cm fand.
The water absorption rate of less than 0.5%.
The compressive strength is greater than or equal to 50MPa. (according to the "JC 79-92 natural marble building board" standard, marble compressive strength is not less than 20MPa; the compressive strength of marble is generally between 70 ~ 110MPa)
* the flexural strength is not less than 7MPa (according to JC 79-92 of natural marble building board "standard, the flexural strength of not less than 7MPa)
Physical properties of qualified granite
The volume density of more than 2.56g/cm fand.
The water absorption rate of less than 0.6%.
By dry compression strength (compressive strength) than 100MPa (according to JC 205-92 natural granite for building slab "standard, the compressive strength of not less than 60MPa; the compressive strength of granite is between 110 ~ 245MPa)
By the bending strength (bending strength) than 8MPa (according to JC 205-92 natural granite for building slab "standard, the flexural strength of not less than 8MPa)
Natural stone is a natural product with its own physical characteristics and the resulting differential characteristics.
The following common appearance features do not belong to the quality of stone.
Is there any wood found? These natural stones contain mesh texture. Natural stone, such as dark enkephalin, light enkephalin and Potter rice yellow, is relatively easy to break through natural cracks in the process of transportation and installation.
Stone is born out of nature for thousands of years, more or less with some defects, such as miscellaneous lines, spots and so on. Marble is not an industrial product. Its impurities and colors absorb natural and solar essence, and different places, environments and levels of marble will produce different spots and chromatic aberrations. So, there is a crack in the stone, not the inferior!
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