Appearance quality inspection standard of O-ring rubber sealing ring

O-shaped rubber seals sealing ring appearance quality inspection standard GB3452.2—87 This standard specifies the appearance quality inspection standard of O-ring rubber seals sealing ring (referred to as O-ring). According to the shape, characteristics and size of O-ring defects, the surface defects are classified and specified. 1 letter symbol d1——O-ring inner diameter d2——O-ring section diameter e——Misalignment size f——Height and width of trimmed convex back extension i——Excessive trimming width g——Mold opening shrinkage width h——Mold shrinkage crack depth j——Flow mark (only allowed in the circumferential direction) length k——Flow mark (only allowed in the circumferential direction) depth l——Concave and convex defect length and width m——Concave and convex defect depth and height 2 quality grades 2.1 grades 2.1.1N grades (general grades): suitable for general purposes. 2.1.2S grade (higher grade): suitable for applications with high requirements on the appearance quality of heaven and earth  use occasions. 2.1.3 NZ grade, SZ grade (special grade): choose up to three types of defects in N grade or S grade, and specify higher appearance quality requirements, called NZ grade or SZ grade, and should be agreed by the supplier and the buyer. 2.2 The quality mark uses the letters specified in 3.1 as the appearance quality mark symbol. 3 Appearance quality 3.1 Dimensions The dimensions and tolerances of the finished O-ring should conform to GB3452.10—'Hydraulic pneumatic O-ring rubber seal size series and tolerances' or the provisions of the relevant national standards. 3.2 General requirements O ring manufactures are not allowed to have pores, cracks and air bubbles; the surface should be smooth and clean, and surface defects should not exceed the specified limit. 3.3 Surface defects The types of surface defects and their quality requirements of the O-ring shall meet the requirements in the table. The maximum allowable limit of surface defects of O-shaped rubber seals seals Additional notes: This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China, and is under the jurisdiction of the Sealing Device Sub-Committee of the National Hydraulic Pneumatic Standardization Technical Committee. This standard is drafted by the Northwest Industry Research Institute of the Ministry of Chemical Industry. Company website: https://www.orksealing.com/
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