Industrial technical requirements for granite vary in their application depending on the application.
1. Main requirements for natural granite blocks:
The main requirements of the building materials industry standard (JC-204-92) for natural granite blocks are as follows:
The block must have the shape of a right-angled parallelepiped. The large side of the block should be parallel to the joint surface or pattern of the rock.
The size of the block requires a length greater than or equal to 140 cm, a width greater than or equal to 60 cm, and a height greater than or equal to 60 cm.
The appearance quality requires that the color tone, pattern and grain structure of the same batch of materials should be basically the same. The quality requirements for the corners, ribs, cracks, color lines and stains of the blocks shall comply with the requirements of Table 4.24.6.
Physical performance requirements: density is not less than 2.50g/cm3; water absorption is not more than 1.0%; dry compressive strength is not less than 60.0MPa; bending strength is not less than 8.0MPa.
2. Quality requirements for acid and alkali resistant granite:
(1) Quality requirements of acid-resistant granite Main chemical composition requirements: SiO2>70%～75%, the higher the content, the better the acid resistance; Al2O3>13%～15%;Fe2O3<0.5%;CaO<0.8%;Mg<0.4 %; acid resistance is greater than 97.5%. hard. The thermal resistivity (compressive strength after 10 to 40 thermal changes) is greater than 16.2 MPa, the melting point is 1610 ° C, the expansion coefficient is less than 8 x 10-3, and the water absorption is less than 1.5%.
(2) The quality requirements of alkali-resistant granite require high content of CaO and MgO. The higher the content, the better the alkali resistance. Some acid-resistant stone has high SiO2 content, but the porosity is small, and it can also be used as alkali-resistant stone. The chemical composition of alkali-resistant granite products produced by Qingdao Stone Factory is as follows: SiO276.6%, Al2O314.39%, (K2O+Na2O) 9.07%, Fe2O31.14%, CaO1.34%, MgO0.68%.
Real Wood Ceiling Fan with Light
The Ceiling Fan is beautiful in appearance, equipped with durable fan blades and lighting of different colors and styles, and has functions such as lighting, cooling, and decoration.There are much more Led Ceiling Fan styles in our website,such as DC Ceiling Fan ,Iron ceiling fan,Wooden Blades Ceiling Fan With Bulbs,Retractable Ceiling Fan Light,Simple Ceiling Fan Lamp,and best decoration Plywood Led Ceiling Fan.And there are more items are not showing on the website,please feel free to contact us directly for more information.
Ceiling Fan,Ceiling Fan With Remote Control,Solid Wood Ceiling Fan,Ceiling Fan With Light,Led Ceiling Fan Light
JIANGMEN ESCLIGHTING TECHNOLOGY LIMITED , https://www.jmesclightingfan.com