HG/T 3090-1987: General rules of visual quality for moulded and extruded rubber

Delivery: 9 seconds. Download (and Email) true-PDF + Invoice.
Get Quotation: Click HG/T 3090-1987 (Self-service in 1-minute)
Newer / historical versions: HG/T 3090-1987

Preview True-PDF

Scope

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.

Basic Data

Standard ID	HG/T 3090-1987 (HG/T3090-1987)
Description (Translated English)	General rules of visual quality for moulded and extruded rubber
Sector / Industry	Chemical Industry Standard (Recommended)
Classification of Chinese Standard	G43
Classification of International Standard	83.140
Word Count Estimation	7,776
Date of Issue	3/7/1987
Date of Implementation	12/1/1987
Older Standard (superseded by this standard)	GB 7529-1987
Regulation (derived from)	Industry-Science (2010) No.77
Summary	This standard specifies the general requirements for the appearance and defects of molded and extruded rubber products. This standard does not apply to injection molded products, 0-shaped rubber rings, pneumatic tires and inner tubes, hard rubber products, sponge rubber products and film products.