Granite slabThe main mineral components of the stone are pyroxene, plagioclase, a small amount of olivine, biotite, and trace magnetite. It has a black luster, precise structure, uniform texture, good stability, high strength, and high hardness after billions of years of aging, and can maintain high precision under heavy loads; Suitable for industrial production and laboratory measurement work.
Physical properties of granite slab:
Flatness tolerance according to GB4987-85 standard:
Level 000=1 × (1+d/1000) um Level 00=2 × (1+d/1000) um
Level 0=4 × (1+d/1000) um Level 1=8 × (1+d/1000) um (d is the diagonal mm) (the measured temperature is generally at 20 ± 2 ℃)
Granite slab specific gravity: 2970-3070kg/m²
Compressive strength: 245-254N/m
Linear expansion coefficient: 4.61 × 10^-6/℃
Water absorption rate:<0.13%
Shore hardness: above Hs70

Granite slab specifications: (special specifications require customization)

Specifications（mm）	Precision grade of granite platform
	000Level flatness	00Level flatness	0Level flatness	1Level flatness
	Flatness tolerance（um）
300×300×70	1.5	3	5.5	11
300×400×70	1.5	3	6	12
400×400×70	2	3.5	6.5	13
400×500×100	2	3.5	7	14
400×600×100	2	3.5	7	14
400×630×100	2	3.5	7	14
450×600×100	2	3.5	7	14
500×600×100	2	3.5	7	14
500×800×100	2	4	8	16
600×900×100	2.5	4.5	9	18
600×900×130	2.5	4.5	9	18
1000×630×150	2.5	4.5	9	18
1000×750×150	2.5	4.5	9	18
1000×1000×150	2.5	5	10	20
1000×1500×200	2.9	5.7	11.3	22.6
1000×1600×200	3	6	12	24
1000×2000×200	3.5	6.5	13	26
1500×2000×200	3.5	7	14	28
1500×2000×300	3.5	7	14	28
1500×3000×300	3.5	7	14	28
2000×3000×300	4.5	8	18	36
2000×4000×400	5.5	11	22	44