High precision granite equipment base

ДЕТАЛИ ПРОДУКЦИИ

COMPARISON OF GRANITE MATERIALS

content	Jinan Black	Indian Black	Sesame Black 654
Specific Gravity	3100-3300kg/m3	3200-3300kg/m3	2900-3000 kg/m3
Elastic Modulus	1.27×105 N/mm2	1.29×105 N/mm2	1.27×105 N/mm2
Coefficient of Linear Expansion	4.61×10 -6/℃	4.61×10 -6/℃	4.61×10 -6/C
Thermal Expansion Coefficient	0.18%/C	0.18%/°C	0.2%/C
Water Absorption	<0.013%	<0.011%	<0.013%
Rockwell Hardness	>70.9	>70.9	>70.9
Radiation Equivalent	0.38uSv/h	0.35uSv/h	0.38uSv/h
Dry Compressive Strength	220.1MPa	221.1MPa	218.3MPa
Appearance	Evenly distributed white specks likesnowflakes (appearing translucent),with a clean and shiny appearanceafter maintenance.	Evenly distributed white specks likesnowflakes, with a black and glossybase material. After maintenance,the appearance is clean and shiny.	There are evenly distributed whitespecks (non-transparent), larger inpattern compared to Jinan Black.After maintenance, the appearanceis clean but less glossy than JinanBlack.
Precision Retention	Below 5 micrometers (um)	Below 5 micrometers (um)	5-10um
Ease of Processing	Easy	Hard	Harder
Due to China’s environmental policies, the mining of Jinan Black granite has been halted since 2006. After 15years, large-sized jinan Black granite blocks have become scarce, only a few pieces can still be found, and it’s nolonger possible to obtain them in large quantities.