The rock platform, also known as the granite platform, the production of precision with reference to the national standard GB4987-85: 
 000 = 1 × (1 + d/1000) um 
 00 = 2 × (1 + d/1000) um 
 0 = 4 × (1 + d/1000) um 
 A = 8 × (1 + d/1000) um 
 (D is the diagonal mm) (measured temperature is generally 20 ± 2 ℃ 
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 Rock platform physical properties: 
 Proportion of the rock platform :2970-3070kg / ㎡, compressive strength :245-254N / m ㎡, linear expansion coefficient: 4.61 × 10-6 / ° C, water absorption: <0.13%, Shore hardness: more than Hs70 
 Rock platform from cutting stereotypes, the coarse grinding to fine grinding into the thermostatic chamber, before and after high accuracy, suitable temperature. Precision than the cast iron measuring accuracy requirements applicable to the high production projects. 
 The marble slab is mainly characterized by precision stability and easy maintenance. 
 The difference between rock platform with cast iron platform; 
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 To talk about the difference between rock platform with cast iron platform, called to talk about the rock platform with cast iron platform, production materials, production of different materials, the impact of the recyclable material, rock platforms and cast iron platform, there are large differences. 
 Granite rock platform for the production of raw materials, granite is a geological rock, the main mineral components of pyroxene, plagioclase, minor olivine, biotite, and trace amounts of magnetite from the magma cooling from hard grained metamorphic rock (geological rock by erosion, weathering) uniform. On behalf of: granite series. Used in industrial production and laboratory measurements. 
 Iron platform for the production of raw material to gray cast iron, alloy cast iron, ductile iron, malleable, easily obtained mature, production methods, can be made into some of the large size of the platform, which is the rock platform can not be compared. 
 Overall, the rock platform and cast iron platform with the difference between the following aspects: 
 A rock platform accuracy than cast iron platform, specification 1000 * 1000mm platform of rock, the accuracy is very easy to reach 0 or 00, and can even reach 000, you can not cast iron platform, cast iron platform can reach 0, the production costs will be far higher than the production costs of the 0 rock platform. 
 Stability, gloss black granite platform, structural precision, granite millions of years of natural aging, internal stress completely disappeared, even texture, not easily deformed, good stability, high strength, high hardness, rock platform in the heavy-duty also maintains high accuracy. By the material of cast iron platform, artificial aging and many other factors in the design and structure, cast iron platform stability as the rock platform. In particular, the impact of the use of temperature on the iron platform is particularly severe temperature changes, it would seriously affect the stability properties of cast iron platform, the use of cast iron platform at room temperature 20 ± 2 ° C. The rock platform is almost by the temperature difference. 
 3 rock Platform acid, alkali, corrosion-resistant, anti-magnetic, does not damp rust, use, and easy maintenance; cast iron platform by the material during use, to ensure that the anti-acid, alkali, rain corrosion. cast iron platform in the production process, to do the degaussing. 
 Uses the difference between the rock platform because of its high accuracy, used for precision tests of the laboratory or factory calibration work. The cast iron platform used for industrial production, assembly, dash, riveting work. 
 5, because the production of different materials, rock platforms can not afford a big impact, knock, high humidity, deformation, moisture absorption of 1%. 
 6, cast iron platform has the scalability, have been hit, bump, cast iron platform near the pit will be protruding, the severe impact of the flatness and the measurement accuracy of cast iron platform; rock platform scalability pit nearby will not, rock platforms flatness measurement accuracy from the pit impact. 
 7, a different approach, cast iron platform after casting, mechanical planing, cutting, manual scraping, grinding, and research processes is made. The rock platform is a granite stone Sawing, drilling after repeated grinding, polishing to a mirror sheen. 
 The Botou Navistar cast material measuring Co., Ltd. Tel: 5664468 13373071795 Contact: Xin Yue