HG 3102-1985 Vulcanized rubber multiple compression test method HG3102-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB 5F02-85
Adjusted to: HG 3102
Rubber, vulcanized-Test methodor multiple compression
Published on May 24, 1985
National Bureau of StandardswwW.bzxz.Net
Implementation on February 1, 1986
1. Scope of application
National Standard of the People's Republic of China
Test method of multiple compression of vulcanized rubber
4F560285
Generation GB1685-79
Rutber vulcanized-Test methodof: multiple compression compression
This standard is applicable to multiple compression tests of vulcanized rubber with Shore A hardness below 85". 2. Test principle
This test is to repeatedly compress the temperature at the center of the rubber sample and the deformation of the sample at a certain frequency and a certain deformation radiation. 3. After a certain time, the temperature of the central part of the rubber sample is measured. 3. 1 The sample is cylindrical with a diameter of 3.2±1.m and a height of 38±1m. 3. 2 The surface of the sample should be smooth, the upper and lower surfaces should be parallel, and there should be no bubbles inside the sample. 4. Test instrument parts and test conditions
and strength.
This test is carried out on a reciprocating fatigue testing machine. The testing machine is required to have sufficient driving force. The upper pressure plate and eccentric mechanism of the testing machine should be adjustable. 4.3. The reciprocating frequency of the testing machine should be variable. During the test, you can choose from 4.2 times/s (250 rev/min), 5 times/s (300 rev/min) and 8.3 times/s (500 rev/min), but the test results of different frequencies are incomparable. The metal pressure plate of the fatigue testing machine should be flat and smooth, and the surface should be padded with 4 to 5m thick organic 44
The softening temperature of glass should be above 100°C, and the upper and lower pressure poles should be parallel to each other. The parallel width difference shall not be greater than 0.2 every 50m. mm.
National Bureau of Standards
1985-05-24 Issued
1986-02-01 Implementation
5602-85
The compression rate can be 10%, 20%, 30% or 40% according to different requirements, but the test results of different compression rates are incomparable. 4.6
Repeatedly compress for 25 soil 1mi1 and immediately measure the temperature of the center. The depth of the needle-shaped thermoelectric piercing the sample is 16±0.5m, and the test results are as follows: The measurement time should be completed within 5s, and the three samples should not exceed 15s.
4,7 Take out the samples from the upper and lower pressure plates and stop working at the test room temperature to measure their permanent deformation. 5 Test steps
5,1 According to the selected compression rate and compression ratio, adjust the test machine, put the sample with the measured titration between the upper and lower pressure plates, and put three samples at the same time, but the height deviation of the three samples should not be greater than 0.5. The sample should be placed in the round hole of the lower pressure pole to prevent the sample from moving during the test. Adjust the upper pressure plate so that it touches the sample, but the sample should not be deformed, then tighten the upper pressure pole and start the test machine.
5,3 According to 4:6, insert a needle-shaped thermocouple from the middle of the side of the sample to measure the sample temperature. 5:4 Pull out the thermocouple, take out the sample and measure its permanent deformation according to 4. 5.5, When doing compression rupture test, the sample should be compressed until it breaks. 6. Test results
6,1: The heat generation of the sample is expressed as the difference between the measured temperature of the sample and the room temperature. The heat generation C of the sample is calculated according to formula (1):
C=Ca-C
Where:
-test room temperature ℃:
-measured temperature of the sample after fatigue ℃
The permanent deformation Q (%) of the sample is calculated according to formula (2): 6
Ho H?
5 602 --85
Where: H. --Test specimen height m;
--height m measured after the specimen is left standing for 1 min after the test. (2)
The number of compressions required for the specimen to break during the test! It can be read on the counter. If there is no calculator, it can be calculated according to formula (8):
Where: n--
-compression frequency
times min;
test time m1n.
6.4, the number of specimens representing each performance of the test product shall not be less than 3, and the arithmetic mean shall be taken. The difference between the individual results and the mean value shall not be greater than 10%. 7. Test report
Test The test report shall include the following contents: a. Sample name and number; b. Test room temperature; c. Compression frequency; d. Compression rate of the sample; e. Test results; f. Test personnel and test date. Additional remarks: This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of Beijing Rubber Industry Research and Design Institute. This standard was initiated by Beijing Rubber Industry Research and Design Institute. The main drafter of this standard is Shu Qinghua. This standard refers to Soviet standard rOCT.266-78 "Rubber Multiple Compression Test Method". 8 e 9g
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