The precision of granite surface plates is in line with the standards of advanced countries.
Tolerance of planeness: Standard
JB/T7975-1999
Grade 000 = 1 × ( 1+d/1000 ) μm
Grade 00 = 2 × ( 1+d/1000 ) μm
Grade 0 = 4 × ( 1+d/1000 ) μm
Grade 1 = 8 × ( 1+d/1000 ) μm
( "d" is the diagonal mm ) (The measuring temperature is normally 20±2°C)
Physical Properties:
S.G: 2970-3070kgs/m
3
Compressive strength: 245-254N/mm
2
Elastic modulus: 1.27-1.47N/mm
2
Lindar expansion coefficient: 4.61 × 10
-6/°C
Water absorptivity:<0.13%
Shore scleroscope hardness: more than Hs70
Specification
Length × Width × Thickness (mm)
Weight (kgs)
Precision Grade (um)
000
00
0
1
300 × 200 × 50
17
1.5
3
6
12
300 × 300 × 50
19
1.5
3
6
12
400 × 300 × 70
25
1.5
3
6
12
400 × 400 × 70
48
2
3.5
6.5
13
630 × 400 × 100
76
2
3.5
7
14
630 × 630 × 100
155
2
4
8
16
800 × 500 × 130
156
2
4
8
16
1000 × 630 × 130
284
2.5
4.5
9
18
1000 × 750 × 150
338
2.5
5
9
18
1000 × 1000 × 150
450
2.5
5
10
20
1600 × 1000 × 200
963
3
6
12
24
2000 × 1000 × 200
1200
3.5
6.5
13
26
1600 × 1600 × 300
2312
3.5
6.5
13
26
2000 × 1600 × 300
2890
3.5
7
14
28
2500 × 1600 × 300
3612
4
8
16
32
3000 × 2000 × 500
9030
4.5
9
18
36
4000 × 2000 × 500
12040
5.5
11
22
44
6000 × 2000 × 700
25284
7.5
15
30
60
Any special specification can be customed 
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