　　Precision Marble Leveling Rule: It is also called moorstone leveling rule or rock leveling rule. It is made by machining and manual grinding of good-quality “Jinan Qing” natural stones, has the advantages of high precision, long service life, acid-alkali resistance, difficult deformation, etc., and is applied to precision detection, precision measurement and precision marking in industries of machining and parts manufacturing. Precision: 000 class-1 level. Execution Standard: GB4987-5.

　　Purpose of Marble Leveling Rule: Measurement of the linearity and the planeness of workpieces and equipment installation; and the planeness and the linearity of platens, guide rails and precision working faces.

　　The marble leveling rule is made of Jinan Qing. It has black color, compact structure, uniform texture, high stability, high strength and high hardness. It is the precision norm measuring device made of natural stones and is an ideal datum plane for the measurement of instruments and meters, precision tools and mechanical parts, particularly the high-precision measurement.

　　The marble leveling rule draws materials from good-quality underground lithospheres, they are naturally aged for hundreds of millions of years, and their state is quite stable, so that you should not worry about the deformation of the marble leveling rule under the ordinary temperature difference.

　　The marble leveling rule undergoing strict physical tests and selection has dense crystallization and hard texture. Because they are non-metallic materials, the moorstones are free of magnetized reaction and plastic deformation. Because of high hardness, the precision holding property of the marble leveling rule is high.

　　Even if the rock tools are bumped by heavy articles while the marble leveling rule is used, only few small stones fall off. Compared with precision measurement norm parts made of good-quality cast iron and steel, the marble leveling rule has high and stable precision. The marble leveling rule manufactured by our company can still keep the original precision after it is not used for one year.

　　Features and Advantages of Marble Leveling Rule:

　　With long-time natural ageing, rocks have uniform organizational structure, extremely low linear expansion coefficient and completely disappeared internal stress and are not deformed, so that the marble leveling rule is high in precision;

　　High rigidity, high hardness and high wear resistance;

　　Acid resistant, alkaline solution resistant, anti-rusty performance, unnecessary oil applying, difficult adhesion of fine dust, convenient maintenance and repairing and long service life;

　　No scratches, no limitation of the constant temperature condition, and high measuring precision at normal temperature;

　　No magnetization, smooth movement during measurement, insusceptibility to dampness, and good planeness.

　　Physical Properties of Marble Leveling Rule: Specific weight: 2,790 to 3,070kg/m3, compressive strength: 245 to 254N/m m2, elastic modulus: 1.27 to 1.47N/m m2, linear expansivity: 4.6*10～6℃, water absorption: 0.13% and Shore hardness: above HS70;

　　Specification of Marble Leveling Rule (the products of special specifications can be designed and produced according to customers’ requirements)

Specification of Marble Leveling Rule（mm）	Working Face Linearity or Planeness		Working Face Linearity or Planeness		Side Face-To-Working Face Verticality
	Precision Levelμm
	00	0	00	0	00	0
500×100×40	1.6	2.6	2.4	3.9	8	13
750×100×40	2.1	3.5	3.2	5.3
1000×120×40	3.0	5.0	4.5	7.5	15	25
1200×120×40	34	6.5	5.5	10	17
1500×150×60	4.4	7.4	6.6	11.1
1600×150×60	4.4	7.4	6.6	11.1	22	37
2000×200×80	5.4	10.0	8.1	13.5	27	45
250020080	7	13	10.5	20
3000×200×100	8	16	12	24

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