Original standard number GB 4495-84 HG/T 2876-1997 Compression deformation test method for microporous materials of rubber and plastic shoes HG/T2876-1997 Standard download decompression password: www.bzxz.net

HG/T2876—1997
This standard is a revision of the original GB/T4495-84 "Test Method for Compression Deformation of Microporous Materials of Rubber and Plastic Shoes". During the revision, this standard added reference standards, definitions, etc. It stipulates the time interval between the test and vulcanization. At the same time, the thickness of the specimen in 3.1 of the original standard was revised from 10mm±0.3mm to 10mm±0.2mm; the specimen was placed at the laboratory temperature for no less than 2h before the test, which was revised to be adjusted at the laboratory temperature for no less than 3h before the test; the measuring pressure of the thickness gauge in 5.1.3 was revised from 58g to 63g; the maximum distance between the two compression plates in 5.2.1 was revised from 11mm±0.2mm to 10mm±0.2mm; the stroke of the lower compression plate was revised from 6to:mm to 5+°mm. From the date of implementation of this standard, the original GB/T4495~84 shall be abolished. This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China, and this standard was under the jurisdiction of Shanghai Rubber Shoes Research Institute. This standard was drafted by Shanghai Rubber Shoes Research Institute, and the main drafters of this standard are: Cai Shengbei and Chen Lishan. ICS61.060
Record No. 448--1997
Chemical Industry Standard of the People's Republic of China
Test Method for Compression Deformation of Microporous Materials for Rubber-Plastic ShoesCellular Material for Rubber-Plasticsshocs-Determination of Compresslon sct1 Scope
This standard specifies the test method for the compression deformation resistance of microporous materials for rubber-plastic shoes. This standard is applicable to the determination of compression deformation of microporous soles such as rubber-plastic cold-bonded shoes and rubber-plastic slippers. 2 Referenced Standards
HG/T 2876-1997
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB2941-91 Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens. (eqvISO471:1983ISO 1826: 1981)
HGT2198--91 General requirements for physical test methods of vulcanized rubber 3 Definitions
This standard adopts the following definitions:
Compression deformation: The deformation of the specimen after the external force causing compression deformation is completely removed. 4. Principle
When the microporous material of rubber and plastic shoes is compressed by external force, the material will deform along the direction of force. When the external force is removed, the material still cannot return to its original geometric size, that is, compression deformation occurs. This method uses this principle to make the microporous material of rubber and plastic shoes into a standard specimen, and measure its resistance to dynamic compression or constant compression deformation on a DeMattia type flexural cracking tester or in a compression fixture.
5 Test device
5.1. The structure of the constant compression fixture is shown in Figure 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997, 10-01, 1997
HG/T2876-1997
1 Explosion wire phase; 2--Annular limit plate: 3 Test sample; 4-upper and lower compression plates; A-the maximum distance between the two annular limiters Figure 1 Constant compression fixture structure
5.1.1 The upper and lower clamps are 25mm±1mm wide and more than 10mm thick. The compression test sample part (A) is 100mm±1mm long. Its surface finish is A7 and should be chrome-plated.
5.1.2 The height of the annular stopper is 5mm±0.02mm. 5.2 Multiple compression deformation is tested with DeMattia type fan flexure crack tester. 5.2.1 The compression frequency is (500±50)r/m, and the sample compression rate is 50%. 5.2.2 The compression plate of the test machine is smooth and clean. The upper and lower compression plates should be parallel to each other. The parallel deviation along the compression plate every 50mm shall not be greater than 0.2 mm.
5.3 Samples
5.3.1 The time interval between the test and vulcanization shall be implemented in accordance with the provisions of GB2941. 5.3.2 The length and width of the sample are 20mm±0.5mm respectively, and the thickness is 10mm±0.2mm. It is polished in accordance with the provisions of HG/T2198. The finished product can be sampled at the bottom of the micropore. The sample made after polishing shall be adjusted at the laboratory temperature for not less than 3h before the test. 5.3.3 If the thickness of the specimen is less than 10 mm, it can be made into a specimen after two layers of bonding and standing for 2 hours. However, its test results cannot be compared with the test results of the standard specimen.
5.3.4 The surface of the specimen should be smooth, without patterns and dense skin. The compression surface should be consistent with the pressure surface of the finished product when it is used. 6 Test procedure
6.1 General tests are allowed to be carried out at room temperature, but arbitration tests should be carried out in accordance with the provisions of GB2941. 6.2 Constant compression deformation test.
6.2.1 The compression rate of the sample is 50%.
6.2.2 The length and width of the sample are measured with a 1/50mm vernier caliper, accurate to 0.02mm. 6.2.3 The height of the sample before and after compression is measured with a 1/100mm thickness gauge, accurate to 0.01mm. The measuring pressure is 63+2g, and the diameter of the measuring plate is 6*0.℃ mm.
6.2.4 There are no less than 100 samples representing each test sample. The height difference of the same group of samples should not be greater than 0.1mmⅡ. 6.2.5 After the sample is numbered and the height is measured, it is placed in the fixture and the nut is tightened to compress the sample to 50% of the original height. The samples should be sufficiently spaced in the fixture so that they will not touch each other when compressed. 6.2.6 The compression time is 72h. When the time is up, take out the sample, leave it for 2h, and then measure the height of the sample after recovery. 6.3 Multiple compression deformation test,
6.3.1 The maximum distance between the upper and lower compression plates is 10mm ± 0.2mm, and the stroke of the lower compression plate is 50.mm. 6.3.2 Paste a 5mm wide medical tape strip on the edge of the lower compression plate and the gap between the specimens to control the displacement of the specimens during the test.
3.3 Place the specimens on the lower compression plate according to the number, start the testing machine for the test, and continuously compress them to 360,000 times (12h), stop the machine HG/T 2876 1997
Take out the specimen, leave it for 1min, and measure its height with an accuracy of 0.01mm. Test results
The compression permanent deformation of the specimen is calculated according to the following formula: K
Where: K——compression permanent deformation, %; H. Height of the specimen before the test. mm;wwW.bzxz.Net
×100%
H-—The recovery height of the sample after parking at the end of the compression test. The arithmetic mean of the three samples is taken as the test result. 8
Test report
The test report should include the following contents
a) Name and number of the sample;
b) Laboratory temperature and humidity;
Test method (standard number of the adopted method);
Test date;
Tester and reviewer.
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