HG/T 2716-1995 Determination of static ozone cracking resistance of rubber or plastic coated fabrics HG/T2716-1995 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Rubber or plastic coated fabrics
Determination of static ozone cracking resistance
HG/T 2716—1995
This standard is equivalent to the international standard IS03011—1981 "Rubber or plastic coated fabrics-Determination of static ozone cracking resistance". Subject content and scope of application
This standard specifies the method for determining the static ozone cracking resistance of rubber or plastic coated fabrics. This standard applies to butyl rubber or plastic coated fabrics exposed to ozone air with specified concentration, temperature and humidity under static strain state, and aging test in an environment without direct sunlight. 2 Reference standards
GB/T7762 Vulcanized rubber ozone aging test static tensile test method 3 Instruments
3.1 Test box
The test box and its accessories should comply with the provisions of the national standard GB/T77G2. 3.2 Sample holder
The sample holder consists of a shaft and a set of clamps (see Figure 1). The diameter of the shaft is about 2, 5, 10 or 20 times the thickness of the sample. It can be agreed upon by the parties concerned, but shall not be less than 0.8 μm. The shaft and the clamps shall be made of materials with good surface finish that do not absorb ozone, such as stainless steel, aluminum alloy or wood coated with ozone-free paint. Test report
Figure! Sample holder
Approved by the Ministry of Chemical Industry of the People's Republic of China on May 9, 1995 and implemented on January 1, 1996
4 Sample
4.1 Sample size
HG/T 2716—1995
The sample size shall meet the requirements for the determination of other items after the ozone resistance test and the comparative test requirements of different samples. The sample size used can be 100mm long and 25mm wide.
4.2 Sampling
The sample should be cut at least 0.1m from the edge of the coated fabric and 1m from the end of the coated fabric. The sample should be representative of the entire batch of coated fabrics and should not be cut at places with obvious surface defects. 4.3 Number of samples
Cut three samples in the warp and weft directions of each coated surface of the coated fabric. 5. Time interval between manufacturing and testing of the sample
Unless otherwise specified in the technical regulations, the following time interval requirements shall be met: For all tests, the shortest time interval between manufacturing and testing shall be 16h: For non-product testing, the longest time interval between manufacturing and testing shall be four weeks; and comparative tests shall be conducted within the same time interval; For product testing, whenever possible, the time between manufacturing and testing shall not exceed three months; In other cases, the test shall be completed within two months from the date of receipt by the user.
6. Test conditions
6.1. Ozone concentration
Ozone concentration shall be carried out in accordance with the provisions of 5.1 of GB/T7762. The method for determining ozone concentration shall be carried out in accordance with the provisions of Appendix A of GB/T7762. 6-2. Temperature
The test temperature shall be in accordance with the provisions of 5.2 of GB/T7762. 6.3. Installation and environmental adjustment of the sample under stress Wrap the sample on the shaft with the test surface facing outward and clamp the two ends of the sample with a clamp. The degree of tightness is just enough to make the shaft rotate freely inside the sample.
Several samples of the same thickness can be wrapped on the same shaft. The sample assembled on the shaft should be placed in a ventilation-free environment with good oxygen in fact, at the standard test room temperature for 24h~48h. bZxz.net
6.4 Flow rate (or flow rate)
The flow rate should be carried out according to 5.4 of G3/T7762.
6.5 Relative condensation
The relative humidity of the air containing ozone should not exceed 65% unless otherwise required. 7 Test procedure
7.1 Adjust the temperature of the test chamber as required. After it reaches the predetermined temperature, place the sample after environmental adjustment into the test chamber. The distance between each sample and between the sample and the chamber wall should be not less than 10mm. 7.2 Pass the air containing the specified ozone concentration with the adjusted flow rate (or flow rate) into the test chamber, and start recording the test time. 7.3 A magnifying glass with a power of 5 to 10 times should be used for regular inspection. During the inspection, an appropriate light source should be used to illuminate the specimen. The magnifying glass can be placed in the test chamber for use. Note:
1) IS0 3011 only stipulates that the test chamber temperature should be kept at a standard temperature for up to 48 h. 134
HG/T 2716—1995
The specimen can also be taken out of the test chamber for a short inspection. During the inspection, do not touch the specimen. 8 Test results
Test results Take the time when the first crack-free test occurs on the two specimens, or report the test time when no cracking occurs. 9 Test report
The test report shall include the following contents:
a) Standard number or standard name;
b) Sample name;
c) Sample thickness and shaft diameter;
d) Ozone concentration and determination method;
e) Test temperature;
[) Test results;
g) Test date;
h) Tester and reviewer.
Additional remarks:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Rubber and Rubber Rubber Products Standardization Technical Committee, and this standard is drafted by the Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhang Shuling.
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