HG 2-163-1965 Test method for low temperature elongation of plastics HG2-163-1965 Standard download decompression password: www.bzxz.net

Ministry of Chemical Industry of the People's Republic of Chinawww.bzxz.net
County Standard
Test Method for Low-Temperature Elongation of Plastics
This standard is applicable to the determination of the elongation of calendered films at low temperatures. I. Key points of the method
HG 2--183-65
No. 29
1. This method is to place the sample in a 5°C refrigerant for 5 minutes, then act under a stress of 70 kg/cm? for 5 minutes, and observe its elongation value. Note: The temperature, time and stress may be specified in the product standard. II. Phosphorus acid sample
2. Sample size: length 120 mm, width 10 ± 0.2 mm, thickness is the original thickness. 3. Number of samples: each group has no less than 5 longitudinal and transverse strips. III. Preparation of acid
4. The low-temperature elongation test is carried out on a cold resistance coefficient measuring instrument (see figure) or other similar instruments. ①The pulley should rotate freely:
②The weight of the code disk should be equal to the weight of the upper tool immersed in the refrigerant! ③The wire rope should be straight and flexible.
The Ministry of Chemical Industry of the People's Republic of China issued Beijing Institute of Chemical Industry
July 1, 1965
Total 3 pages Page 2
HG 2-163--85
Paint avoidance coefficient tester
1-sample support, 2-pillar, 3-bakelite cylinder: 4 upper tool, 5-lower clamp. 6-wire rope; 7-pulley, 8-code disk; 9-code; 10-tray, 11-small vise, 12-wrench, 13 bottle holder, 14-base, 15 heavy chain, 16-pointer, 17-scale, 18-sample. 5. The micrometer has an accuracy of 0.001 mm.
IV. Instruments
6. Measure the elongation of the steel wire rope during the test in the following way. Replace the sample with a steel sheet weighing about 15 grams and clamp it on the fixture. Place a weight equal to the weight of the steel sheet on the weight plate. Then add a load of 0.250 kg to the weight plate. Record the elongation of the steel wire rope. Add a load of 0.250 kg and record the new elongation until the added weight is equal to 4 kg. And draw a load-elongation curve. 86
HG 2—163-65
7. The steel wire rope should be calibrated at least once every 3 months. Five steps
Total 3 pages Page 3
8. Measure the sample. The thickness is accurate to 0.001 mm and the width is accurate to 0.1 mm. Measure three points each and take the arithmetic average. Calculate the load value required for the cross-sectional area of ​​the sample based on the stress of 70 kg/cm?. 9. Clamp the sample between the clamps, with an effective length of 100 ± 1 mm. 10. Place the clamped sample in the bakelite of the instrument, straighten it, and adjust the zero point. Note: The force used to clamp the sample should be appropriate to prevent the sample from breaking or falling off. 11. Add dry ice to the mixture of 1 volume of industrial ethanol and 2 volumes of water to keep its temperature at 5±0.5\c-
12. Place the loaded sample in the refrigerant, keep it for 5 minutes, then load it, and read the elongation value of the sample after loading for 5 minutes.
Note: ① During the test, the end of the source meter should be located in the middle of the sample. ② Stir the refrigerant frequently to ensure uniform temperature! ③ Load slowly and there should be no impact. VI. Test Results
13. The low-temperature elongation e (%) is calculated as follows: AL×100
Where, L. —Original effective length of the specimen, mm; elongation value of a specimen at low temperature (subtract the corresponding correction value^1 from the reading), mm. AL
14. The test results are expressed as the arithmetic mean and the maximum and minimum values ​​of all specimens in the longitudinal direction (or transverse direction). 15. The following information shall be recorded for each test:
(1) Name, number and unit of the specimen: (2) Size and quantity of the specimen:
(3) Test temperature and instrument model:
(4) Required load for each specimen:
(5) Low temperature elongation of each specimen, the arithmetic mean of all specimens; (6) Test date and tester.
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