HG/T 3090-1987 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| HG/T 3090-1987 | English | 105 |
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General rules of visual quality for moulded and extruded rubber
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HG/T 3090-1987: General rules of visual quality for moulded and extruded rubber---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT3090-1987
HG
CHEMICAL INDUSTRY STANDARD
UDC 678.4.06.678.01
HG/T 3090-1987(1997)
Replacing GB 7529-1987
General rules of visual quality for moulded and extruded
rubber products
Issued on: MARCH 07, 1987
Implemented on: DECEMBER 01, 1987
Issued by. Ministry of Chemical Industry of PRC
Table of Contents
1 Molded products... 3
2 Extruded products... 8
Additional notes... 10
General rules of visual quality for moulded and extruded
rubber products
This standard specifies the general requirements for various appearance defects of
molded and extruded rubber products.
This standard does not apply to injection molded products, O-rings, pneumatic tires and
inner tubes, hard rubber products, sponge rubber products and film products.
1 Molded products
1.1 Terms
1.1.1 Major defects. Defects that can cause failure or seriously reduce the practical
performance of the product.
1.1.2 Minor defects. Defects that have only a slight or almost no effect on the practical
performance of the product.
1.1.3 Position No. I defects. Defects that play a major role on the surface of molded
products and are related to dimensional tolerances and practical performance.
1.1.4 Position No. II defects. Defects that do not play a major role on the surface of
molded products and are not related to dimensional tolerances and practical
performance.
1.2 Classification of molded products
The specifications and shapes of molded rubber products are diverse, but these products
have several basic uses or usage requirements with similar performance and quality
requirements. Therefore, according to their actual use and use requirements, they are
roughly divided into the following categories.
1.2.1 Flexing resistance
The products are mainly used in situations where they are subjected to constant or
periodic bending, torsion or flexion during use.
1.2.2 Sealing
The products are mainly used in fluid sealing situations.
1.2.3 Blocking
The products are mainly used in situations where liquid or gas penetration is prevented.
1.2.4 Matching
The products are mainly used in situations where they must be assembled with
accessories and have tolerance requirements.
1.2.5 Protection
The products are used as outer materials in situations where there is no mechanical
stress or mechanical stress is occasionally generated.
1.2.6 Filling
The products are used in situations where there is no mechanical stress or mechanical
stress is occasionally generated to fill the internal space.
1.2.7 Vibration reduction (buffering)
The products are mainly used in situations where vibration reduction, buffering, sound
insulation are required.
1.2.8 Others
The products are used in other situations except for the above-mentioned uses.
1.3 Defect categories and quality requirements for molded products
1.3.1 Defects of molded products are divided into two categories. major defects and
minor defects, according to their performance.
1.3.2 Defect categories and quality requirements for molded products are as specified
in Table 1.
2 Extruded products
2.1 Terminology
2.1.1 Major defects. See Article 1.1 of this standard.
2.1.2 Minor defects. See Article 1.2 of this standard.
2.1.3 Position No. III defects. It refers to defects that appear on the sealing surface of
the extruded product.
2.1.4 Position No. IV defects. It refers to defects that appear on the visible surface of
the non-sealing surface of the extruded product.
2.1.5 Position No. V defects. It refers to defects that appear on the invisible surface of
the non-sealing surface of the extruded product.
2.2 Classification of extruded products
The specifications and shapes of extruded products are diverse, but there are several
basic uses or usage requirements.
2.2.1 Sealing type
Used in fluid sealing occasions.
2.2.2 Wrapping type
Used in occasions where it plays an intermediate connection role when wrapping
materials, gap materials, cushions or similar purposes.
2.2.3 Non-sealing and non-wrapping type
Used in occasions where internal gap fillers play an auxiliary role.
2.2.4 Others
For use in other applications other than the above three basic uses.
2.3 Defect categories and quality requirements of extruded products
2.3.1 Defects of extruded products are divided into two categories. Major defects and
minor defects, according to actual performance.
2.3.2 Defect categories and quality requirements of extruded products are specified in
Table 2.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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