Material

Zhonghui Intelligent Manufacturing Group(ZHHIMG) has found and tested a lot of granite in the world to find the best granite material.

Granite Source

Why Choose Granite?
• DIMENSIONAL STABILITY: black granite is a natural aged material formed over millions of years and therefore displays great internal stability.
• THERMAL STABILITY: the linear expansion is much lower than the steel or cast iron ones.
• HARDNESS: comparable to good-quality tempered steel.
• WEAR RESISTANCE: instruments last longer.
• ACCURACY: the flatness of the surfaces is better than the one obtained with traditional materials.
• RESISTANCE TO ACIDS, NON-MAGNETIC ELECTRICAL INSULATION RESISTANCE TO.
OXIDATION: no corrosion, no maintenance.
• COST: working the granite with state-of-the-art technology prices are lower.
• OVERHAUL: Eventual servicing can be carried out quickly and cheaply.

Global Main Granite Material

Jinan Black Granite

Indian Black Granite

African Black Granite

Pink Granite

FuJian Granite

Impala Granite

Austria Grey Granite

Blu Lanhelin Granite

Zhangqiu Black Granite

There are many kinds of granite in the world, and these nine kinds of stone are mainly used now. Because these nine kinds of stones have better physical properties than other granite. Especially Jinan black granite, which is the best granite material we've ever know in precision field. ZEISS, HEXAGON, China AEROSPACE...all chose Jinan Black Granite.

Global Main Granite Material Analysis Reports

Material Items Origin	Jinan Black Granite	Indian Black Granite	South African Granite	Impala Granite	Pink Granite	Zhangqiu Granite	Fujian Granite	Austria Grey Granite	Blu Lanhelin Granite
Material Items Origin	Jinan,China	Camo, India	South Africa	South Africa	America	Jinan, China	Fujian,China	Austria	Italy
DENSITY(g/cm3)	3.07	3	2.93	2.9	2.65	2.88	2.9	2.5-2.8	2.6-2.8
Water absorption(%)	0.051	0.022	0.06		0.07	0.16
Coefficient of termal expansion 10-6/℃	5.7-7.34	6.78	9.07		N/A	N/A
Flexural strength (MPa)	27.9	33.9	22		16.7	15.8
Compressive strength(MPa）	276	296	240		140	216
Modulus of Elasticity(MOE) 104mpa	10	12.1	10		N/A	5.15
Poisson's ratio	0.3	0.26	N/A		N/A	0.27
Shore hardness	90	90	N/A		N/A	94
Modulus of Rupture(MOR) (MPA)	N/A	N/A	N/A		17.4	N/A
Volume Resistivity(Ωm)	5~6 x10⁷	5~6 x10⁷	5~6 x10⁷	5~6 x10⁷	5~6 x10⁷	5~6 x10⁷	5~6 x10⁷	5~6 x107	5~6 x10⁷
Resistance Rate(Ω)	9 x 10⁶	9 x 10⁶	9 x 10⁶	9 x 10⁶	9 x 10⁶	9 x 10⁶	9 x 10⁶	9 x 106	9 x 10⁶
Natural Radioactivity

1. The material testing experiments were initiated by Zhonghui Intelligent Manufacturing (Jinan) Group Co., Ltd.
2. Six samples of each type of granite were tested, and the test results were averaged.
3. The experimental results are only responsible for the test samples.