A granite platform Material: natural stone, "Jinan Qing", also known as "green", the major mineral composition of the marble platform of pyroxene, plagioclase, minor olivine, biotite, and trace amounts of magnetite , black color, and precise structure, granite material quality of the rock layer on the ground after millions of years of natural aging, the form is extremely stable, do not worry deformed due to the conventional temperature difference. 
 (2) the use of the Flat Rock: granite slab on the instrumentation, precision tools, mechanical parts of the test, are ideal datum. Granite precision detection platform for the industrial production and laboratory measurements; especially for high-precision measurement, due to the Department of Flat Rock, non-metallic materials, no magnetic response, there is no plastic deformation. Therefore, to maintain good accuracy, is a cast iron plate can not be compared. 
 3 marble sophisticated detection platform physical properties: compressive strength of 2290-3750 kg / square cm; hardness of Ta Mok's hardness of 6-7, the hardness of the granite platform is 2-3 times higher than the cast iron (the equivalent of HRC> 51 ). the proportion 2970-3070kg/m3, compressive strength :2500-2600kg / cm3, the coefficient of elasticity :1.3-1 .5 x 106kg/cm2, water absorption <0.13%, Shore hardness HS70 above. Physical stability, careful organization by the impact grain off the surface can not afford to flash, does not affect the plane accuracy. 
 Granite platform maintenance is simple: to constant temperature flat after use. Afraid of acid, alkaline liquid material erosion, and will not rust, do not need oiling, easy to stick dust to maintain the original accuracy shelved a year later, the same maintenance, maintenance easy, long service life;