This standard specifies the appearance quality inspection standard for O-ring rubber seals. According to the shape, characteristics and size of the O-ring defects, the surface defects are classified and specified. GB/T 3452.2-1987 Appearance Quality Inspection Standard for O-ring Rubber Seals GB/T3452.2-1987 Standard download decompression password: www.bzxz.net

UlL: 678. 4. 01 : 621.643-762G 43
National Standard of the People's Republic of China
GB 3452. 2-87
Appearance quality acceptance criteria for rubber O-rings1987-03-26 Issued
Implementation on 1987-12-01
Issued by the State Bureau of Standards
National Standard of the People's Republic of China
Appearance quality acceptance criteria for rubber O-ringsAppearance quality acceptance criteria for rubber O-ringsUK:678.4.01
621.643-762
GB 345 2. 2 87
This standard specifies the appearance inspection and marking of O-rings (simple O-rings). According to the shape, characteristics and size of the ring defects, the surface defects are classified and the specifications are required. 1 Letter symbol
d —- α Ring inner diameter
Ring drum diameter wwW.bzxz.Net
Dislocation size,
in. —- Repair after the concave extension height and width.
Excessive edge width.
Die crack width.
Die shrinkage crack depth.
Flow mark (only allowed along the circumferential direction) length. Flow mark (only allowed along the circumferential direction) depth. Length and width of concave and convex defects.
Depth and depth of concave and convex defects.
2 Quality grade
2.1 Grade
2.1.1 N grade (-- general grade): suitable for general use 2.1.2 S grade (higher grade): suitable for use occasions with higher appearance quality requirements. 2.1.3 NZ grade, SZ grade (special grade): Select the most defects in N grade or S grade, specify higher appearance quality requirements, called NZ grade or S7 grade, and shall be agreed upon by both parties. 2.2 Quality mark
Use the letters specified in 3.1 as the appearance quality mark symbols. 3 Appearance quality
3.1 Size
The size and tolerance of the finished O-ring shall comply with the provisions of GB3452.1-82 "Dimension series and tolerance of O-ring rubber seals for hydraulic and pneumatic use" or relevant national standards.
3.2 General requirements
O-rings are not allowed to have pores, cracks, impurities, bubbles, and the surface shall be smooth and clean. The surface defects shall not exceed the specified limits. 3.3 Surface defects
The surface defect types and quality requirements of O-rings shall comply with the provisions in the table. Approved by the Ministry of Chemical Industry of the People's Republic of China on March 7, 1987, 12-01, 1987
Defect Name
2-Element Shrinkage Crack
GB 3452. 2-87
Maximum Permissible Limit of Surface Defects of D-Shaped Rubber Seal RingsMaximum Permissible Limit Surface Diameter (4)
Schematic Diagram
Convection Marks, Four, Convex Defects Sinking Under the Limit Conditions Specified in this Table
1 80 2. 65 3. 55 5. 30. 7. 001. 80 2. 65 3. 55 ±. 30 7. 000. 08 0. 1u 0. 1± t. 15 0. : 50. 08 0. 08 0. 0 0. 12 0. 1390. 18 0. 27 0. 36 0. 53 0. 70 0. 10 0. 15 0. 20 0. 20 0. 30: 0. 08 0. 08 0. 10 0. 10 0. 130, 05 0. 08 D. 10 0. 10 0. 130. 10 0. 12 0. 14 0. 16 0. 18 0. J0 0. 10 0. 13 0. 15 0. 150. 08 0. 08 1. 00 1. 20 1. 500. 08 0. 08 1. 00 1. 00 1. 200.05 or
1. 50 2. 00 1. 00 5. 00 5.002. 00 3. 00 5. 50 6. 50 6. 500.08 0.080.080.08 0.08
0. 05 0. 05 0. 05 0. 05 0. 050. 60 0. 80 1. 00 1. 30 1. 600.20 0.25 0. 40 0. 63 1. 00
0. 08 0. 08 0. 10 0. 10 0.130. 08 0. 08 0. 10 0. 10 0. 13a.0 The circumference of the figure is within 25mm, and the defects shall not be more than 3; b. The pits are not interconnected:
c. If the distance between the defects is less than the specified defect width limit, the defects shall not be more than 3 2
Additional instructions,
GB 3452.2-87
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and was approved by the Sealing Device Subcommittee of the National Hydraulic and Pneumatic Standardization Technical Committee.
This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Su Gui.
National Standard of the People's Republic of China
O-ring Appearance Quality Inspection Standard GD 3452. 2-- 87
China Standards Publishing House Beijing Publishing House
(Beijing Fuwai-Lihe)
China Standards Publishing House Printing in Beijing, Guangdong Printing, Xinhua Bookstore, Beijing Distribution, Distributed Continuously
Xinhua Bookstores in various places have the same rights and are strictly authorized. No ketone printing
Format 880× 1230 1/16
198R 3 H, first edition
printed sheets. 5
March 1988 First pre-press
Printed in 1-7 000
Book number: 151691-5337
Price and yuan
Mark date 87-7
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