The main mineral composition of granite for the pyroxene, plagioclase, small amounts of olivine, biotite and trace magnetite, black color, structure of precision, after aging, hundreds of millions of years of uniform texture, good stability, high strength, high hardness, can maintain the high accuracy under the heavy load. Use the granite block cutter cut.

Granite slab is a precision reference measurement tool made of natural stone material, inspection of the instruments, precision tools, machinery parts, is the ideal reference surface. Especially for the measurement of high precision, because it be richly endowed by nature, and make the cast iron plate be inferior by comparison. Granite rock layers Underground Based on quality, after millions of years of natural aging, form extremely stable, don't worry and deformation due to the normal temperature. After the strict physical test and selection of the granite stone, fine crystal, hard texture, compressive strength up to 2290-3750 kg / cm2, hardness of the Mohs hardness grade 6-7. Extremely wear-resistant, acid resistance, alkali resistance, a high resistance to corrosion, never rust. The granite is non-metallic materials, no magnetic response, no plastic deformation. The hardness of 2-3 times higher than the cast iron (equivalent to HRC>51), so the good precision. Even rock tools in use by heavy Kepeng, at least out of stone ballast only, and not as metal tools that, due to deformation and damage of precision. Precision measurement reference part making its superior quality iron and steel, to obtain high and stable accuracy.

The natural granite stone machining, manual lapping and. Black gloss, precise structure uniform texture, good stability. High strength, high hardness. And has no rust, acid and alkali resistance: no magnetization, constant type, has the advantages of good abrasion resistance etc.. Can keep stable in the heavy load and the general temperature.

Granite slab, precision granite slab, granite slab, instrument test platform, the use of high-quality "green Ji'nan" stone by mechanical processing and hand-made fine grinding. Black gloss, precise structure, uniform texture, good stability, high strength, high hardness, can in the heavy load and under general temperature keeps the high precision, and has no rust, acid and alkali resistance, wear resistance, not magnetic, the same type and so on. The measuring tool of granite plate is suitable for machinery factory.