High Precision Granite Square Gauge Square Angle Degree Measuring Tools Marble Inspection Ruler

Marble squares are mainly used for the detection of parallelism and verticality. The main mineral components of marble squares are rubble, plagioclase, olivine, biotite and micro-magnetite, black color, precise structure code, after millions of years of aging, uniform texture, good stability, high strength, high hardness, and can maintain high precision under heavy load.

1) Compressive strength is greater than or equal to 245 mpa;

2) Flexural strength 22 kn/mm2;

3) Shore hardness is greater than HS70;

4) Water absorption is less than 0.25%.

5. The hardness of the working face of marble square (granite square) should be uniform and the Shaw hardness of all parts of the working face should be above HS70.