1

appearance

Quasi square chamfer

visual

2

thickness

Average thickness

200 ± 20 μm

200 ± 5 μm

Sorting machine

3

TTV

≦25.0 μm

Sorting machine

4

The length (on the margins)

156.0 ± 0.3 mm

ruler

5

diameter

219.0± 1.0 mm

ruler

6

Chamfer

1.5± 0.5 mm

Film ruler

7

bevel angle

45ﾟ± 10ﾟ

angle square

8

Right angle

90ﾟ± 0.2ﾟ

angle square

9

Line

≦ 10 μm

Sorting machine, roughness tester

10

Edge defect

不允许

visual

11

V type gap

不允许

visual

12

Warp degree

Bending degree

≦ 50.0 μm

≦ 40.0μm

Feeler, sorting machine

13

Surface condition

No visible impurities, dirt, cracks, perforation; 

visual