GB/T 5574-1994 Industrial rubber sheets

This standard specifies the size, basic properties, additional properties, surface quality, test methods, acceptance rules, etc. of industrial rubber sheets. This standard applies to industrial rubber sheets made of natural rubber or synthetic rubber as the main material (hereinafter referred to as industrial rubber sheets). It is also applicable to rubber strip products with rectangular cross-sections. GB/T 5574-1994 Industrial Rubber Sheet GB/T5574-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber sheet
Industrial rubber sheet
1 Subject content and scope of application
GB/T 5574-94
Replaces GB5574-85
This standard specifies the specifications, dimensions, basic properties, additional properties, surface quality, test methods, acceptance rules, etc. of industrial rubber sheets. This standard applies to industrial rubber sheets made of natural rubber or synthetic rubber as the main material (hereinafter referred to as industrial rubber sheets). It is also applicable to rubber strip products with rectangular cross-sections.
2 Reference standards
GB/T528 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T531
GB/T1682
Test method for Shore A hardness of rubber
Test method for brittle temperature of vulcanized rubber
Test method for liquid resistance of vulcanized rubber
GB/T1690
GB/T3512
GB/T5575
GB/T 6031
GB/T 7759
GB/T 7762
GB 11176
Test method for hot air aging of rubber
Unvulcanized rubber sheet for chemical equipment lining
Determination of international hardness of vulcanized rubber (30-85IRHD)Conventional test methodDetermination of permanent deformation of vulcanized rubber under constant deformation compression at room temperature and high temperatureOzone aging test for vulcanized rubberStatic tensile test methodElectrical insulating rubber sheet
HG/T2180
Naturally vulcanized rubber sheet for lining of phosphoric acid storage tank3Specifications and dimensions
The nominal thickness, width and deviation shall comply with the provisions of Table 1. The nominal length and deviation shall be agreed upon by the supplier and the buyer. Approved by the State Bureau of Technical Supervision on December 22, 1994 and implemented on October 1, 1995
Nominal size
Technical conditions and test items
4.1 Technical conditions
4.1.1 Oil resistance is divided into:
Class A is not oil resistant
GB/T 5574—94
Nominal size
5002000
Class B is medium oil resistant Volume change rate (AV)%+40～+90Class C is oil resistant Volume change rate (△V)%
—5～+40
Test conditions: After soaking in No. 3 standard oil at 100℃ for 72 hours, measure the volume change rate. 4.1.2 Tensile properties
4.1.2.1 Tensile strength (MPa) is divided into:
Type 1 ≥3Type 2 ≥4
Type 3 ≥5
Type 4 ≥75Type ≥106Type ≥14
7 Type ≥17
4.1.2.2 Elongation at break (%) is divided into:
Grade 1 ≥100
Grade 3 ≥200
Grade 5 ≥300
Grade 7 ≥400
Grade 9 ≥600
Grade 2 ≥150
Grade 4 ≥250
Grade 6 ≥350
Grade 8 ≥500
4.1.3 Nominal hardness is divided into the following according to the international hardness of rubber (or Shore A hardness): H3: 30
H4: 40
H6: 60
The deviation of nominal hardness is ±5
4.1.4 Heat air aging resistance (A,) is divided into: A,1
GB/T 5574--94
After aging at 70℃×72h, the reduction rate of tensile strength is ≤25%, and the reduction rate of elongation at break is ≤35%. A.2After aging at 100℃×72h, the reduction rate of tensile strength is ≤20%, and the reduction rate of elongation at break is ≤50%. Class B and Class C rubber sheets must meet the requirements of A, 2. If there is no special mark in the mark, if it cannot meet the needs, it shall be agreed upon by the supply and demand parties. 4.2 Additional performance
If the following additional performance is required, its specific indicators shall be agreed upon by the supply and demand parties. 4.2.1 Heat resistance (H.)bzxZ.net
The specified test temperature is;
100℃
125℃
150℃
The test cycle is 168h.
4.2.2 Low temperature resistance (T,)
The specified brittleness test temperature is:
—20℃
-40℃
4.2.3 Compression permanent deformation (C.)
Test conditions are 70℃×24h
4.2.4 Ozone aging resistance (O.)
Test conditions: ozone concentration is 50MPa (50pphm), 40℃×96h Note: Various special performance industrial rubber sheets such as: chemical corrosion resistance has GB/T5575, HG2180, etc. Electrical insulation has GB11176, etc. There are also conductive, flame retardant, contact with food, etc.
4.3 Surface pattern type and color are agreed upon by both the supply and demand parties. 5 Marking
5.1 Marking method
Product name--Technical characteristic code-Standard number5.2 Marking example
For example: a non-oil-resistant rubber sheet with a tensile strength of 5MPa, an elongation at break of 400%, a nominal hardness of 60IRHD, and a heat resistance of 100℃ is marked as:
Industrial rubber sheet A
HG/TXXXX
Standard number
Heat resistance
Nominal hardness
Elongation at break
Tensile strength
-Oil resistance
Product abbreviation
6 Surface quality
GB/T5574-94
The surface of the rubber sheet is not allowed to have cracks or perforations. For other defects that affect the performance, there should be no more than 3 defects per 3m2, and the area of ​​each defect should not exceed 1cm2. If there are other requirements, it shall be agreed upon by both parties. 7 Test methods
7.1 The specifications and dimensions shall be measured with a caliper and a box ruler with an accuracy of 0.05mm. The thickness shall be measured along the width direction of the rubber sheet, and the average value of 5 points shall be taken.
7.2 The determination of oil resistance and acid and alkali (corrosion) resistance shall be carried out in accordance with the provisions of GB/T1690. 7.3 The determination of tensile properties shall be carried out in accordance with the provisions of GB/T528. 7.4 The determination of international hardness shall be carried out in accordance with the provisions of GB/T6031, and the determination of Shore A hardness shall be carried out in accordance with the provisions of GB/T531. For samples that need to be polished, the test shall be carried out 16 hours after polishing. The arbitration test shall be carried out in accordance with the provisions of GB/T6031. 7.5 The determination of hot air aging and heat resistance shall be carried out in accordance with the provisions of GB/T3512. 7.6 The determination of low temperature resistance shall be carried out in accordance with the provisions of GB/T1682. 7.7 The determination of compression permanent deformation shall be carried out in accordance with the provisions of GB/T7759. 7.8 The determination of ozone resistance shall be carried out in accordance with the provisions of GB/T7762. 7.9 The surface quality shall be inspected by corresponding measuring tools and visual inspection methods. 8 Acceptance rules
8.1 Batching and sampling 30t of the same type of rubber sheet shall be considered as a batch. When the half-monthly output is less than 30t, the half-monthly output shall be considered as a batch. Ten rolls shall be randomly selected from each batch for the inspection of specification size and surface quality, and then one roll shall be randomly selected from the 10 rolls, and sufficient samples shall be taken from 30cm from the end for physical property inspection.
8.2 Inspection classification
8.2.1 Factory inspection
8.2.1.1 Inspection items
Specification size, surface quality and hardness, tensile strength, elongation at break, oil resistance, etc. 8.2.1.2 Judgment rules
If there is one unqualified item in the specification size of each roll or two unqualified items in the surface quality of each roll, the roll shall be considered as a defective product. If there are more than two rolls of unqualified products, the batch of products shall be unqualified.
For the inspection of hardness, tensile strength, elongation at break and oil resistance, if one of the indicators does not meet the requirements, double the sample shall be taken for retest. If it still does not meet the requirements, the batch of products shall be unqualified. 8.2.2 Type inspection
8.2.2.1 Inspection items
All technical requirements listed in this standard are type inspection items. Under normal circumstances, hot air aging, heat resistance, low temperature resistance and other items shall be inspected once every quarter, and ozone resistance shall be inspected once every six months. 8.2.2.2 Judgment rules
The sampling batch and judgment method of specification size and surface quality are the same as 8.1 and 8.2.1.2. If one of the indicators of physical performance inspection does not meet the requirements, double the sample shall be taken for retest. If it still does not meet the requirements, the batch or period of products shall be unqualified. 9 Marking, packaging, transportation and storage
9.1 Both ends of the industrial rubber sheet should be printed with obvious markings, including: mark, trademark, manufacturer name, production date, and product certificate. The product certificate should include the mark, production date, inspector code, etc. 9.2 Industrial rubber sheets should be rolled and tied tightly into packaging bags or boxes, and the rubber sheet mark, production date, factory name, factory address and quantity should be marked on the packaging. Each package should generally not exceed 60kg. 128
GB/T5574-94
9.3 Industrial rubber sheets should be kept clean during transportation and storage, and should not come into contact with oils, acids, alkalis or other substances that may damage their quality, and should be kept away from direct sunlight.
9.4 Industrial rubber sheets should be placed vertically during storage, with a temperature of -15~~+35℃, a relative humidity of 50%~~85%, and 1m away from heat sources. 9.5 Under the conditions specified in this standard, from the date of manufacture, within a storage period of no more than one year, its quality and performance should comply with the provisions of this standard.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Beijing Rubber Products Design Institute. This standard was drafted by Beijing Rubber Products Design Institute, Shanghai Rubber Products Factory No. 1, and Wuxi County Rubber and Plastic Products Factory. The main drafters of this standard are Zhang Cheng'e, Song Baoqing, Qiu Ronggen, and Fang Jiehong. This standard refers to the French standard NFT47-402-1980 "Classification of Industrial Rubber Sheets". 129
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