O shaped rubber seal appearance quality inspection standard GB3452.2-87

This standard stimulates the o-ring rubber sealing ring (o-ring) appearance quality inspection standards. According to the shape of the o-ring defects, character and size, the surface defect classification and specified requirements.

1 alphabetic character

D1 - the o-ring diameter

D2 - o-ring cross section diameter size e - dislocation

F - trimming convex treads high and width

I - excessive trimming width

G - open mold shrinkage LieKuan degrees

H - open mold shrinkage crack depth

J - flow mark (only allowed along the circumferential direction) length

K - flow mark depth (only allowed along the circumferential direction)

L, concave, convex defect length, width

M - concave, convex defect depth, height

2 quality grade

2.1 level

2.1.1 N level (level) : suitable for general use.

2.1.2 s-class (more advanced) : for the heavens and the earth appearance quality requirements higher & have spent Use occasion.

2.1.3 NZ, SZ (special) : in the N level and choose up to three kinds of defects in the s-class, the appearance of the higher quality requirements, levels called NZ or SZ, and should be decided by both parties of supply and demand.

2.2 quality marks used in 3.1 the letters as stipulated in the appearance quality mark symbols.

3 appearance quality

3.1 size

O-ring dimensions and tolerances of finished products shall conform to the GB3452.10 - the hydraulic pneumatic O shaped rubber seal series and size, or the provisions of the relevant national standards.

3.2 general requirements

O-ring is not allowed to exist porosity, crack, bubble; Surface should be smooth, clean, surface defects should not exceed the specified limit.

3.3 surface defects

O-ring surface defect types and quality requirement, shall comply with the provisions in the table.

O shaped rubber seal surface defect of maximum allowable limit

Additional instructions:

This standard put forward by the ministry of chemical industry of the People's Republic of China, by the national standardization technical committee of hydraulic pressure pneumatic sealing device subcommittee under centralized.

This standard by chemical northwest institute of rubber industry products responsible for drafting.