granite important performance

 (1) has a good decorative performance, applicable to public places and outdoor decoration.
 (2) has excellent processing performance: sawing, cutting, polishing, drilling and carving. Its precision up to 0.5μm or less, brightness up to 1600 or more.
 (3) good wear resistance, 5-10 times higher than cast iron.
 (4) thermal expansion coefficient is small, not easily deformed, and indium steel similar to the  grinding cup wheels influence of temperature is minimal.
 (5) elastic modulus, than iron.
 (6) good rigidity and damping within the large, 15 times greater than steel. Can shock, shock.
 (7) granite brittle, damaged after only a partial loss, without affecting the overall flatness.
 (8) granite chemically stable, not easily weathered, acid, alkali and corrosive gases, erosion, and  grinding wheels chemical resistance is proportional to the silica content, the service life of up to 200 years or so.
 (9) granite is not conductive, non-magnetic, the field is stable.
  Typically, granite divided into three different categories:
  Fine-grained granite: feldspar crystals of an average diameter of 1/16 to 1/8 inch.
  Medium-grained granite: feldspar crystals with an average diameter of about 1/4 inch.
 Coarse granite: feldspar crystals average diameter of about 1/2 inch diameter and larger crystals, and  wood drill bits some even reach several centimeters. Relatively low density of coarse-grained granite.
    In recent years, monument building stone used in 83% of granite, marble and 17%.