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Chemical Industry Standard of the People's Republic of China
HG/T2333-92
O-ring rubber materials for vacuum
Published on June 1, 1992
Ministry of Chemical Industry of the People's Republic of China
Standard search network troso.con Various standard industry materials free download 1993-10-01 implementation
Chemical Industry Standard of the People's Republic of China
O-ring rubber materials for vacuum
1 Subject content and scope of application
HG/T2333-92
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of O-ring rubber materials used in vacuum systems.
This standard applies to solid O-ring rubber materials used in vacuum systems. 2 Reference standards
GB528 Determination of tensile properties of vulcanized rubber
Test method for Shore A hardness of rubber
GB/T533 Determination method for density of vulcanized rubberGB1682 Test method for brittle temperature of vulcanized rubberGB1690
GB2828
Test method for liquid resistance of vulcanized rubber
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Dimension series and tolerance of O-shaped rubber sealing rings for hydraulic and pneumatic useGB3452.1
Appearance quality inspection standard for O-shaped rubber sealing ringsGB3452.2
GB3512
GB5720
GB5721
GB5722
GB5723
GB60 31
GB6032
GB7759
GB9865
3 Classification
Rubber hot air aging test method*
Standard method for O-ring test
General provisions for marking, packaging and transportation of rubber sealing products General provisions for storage of rubber sealing products
General provisions for measurement of dimensions of test pieces and products for vulcanized rubber testing Determination of the international hardness of vulcanized rubber (30-85IRHD): conventional test method Determination of the international hardness of vulcanized rubber (30-85IRHD) micro test method
Determination of the permanent compression set of vulcanized rubber under constant deformation at room and high temperatures Preparation of vulcanized rubber samples and test specimens
According to the amount of gas released by the rubber material under vacuum, it is divided into two categories: A and B. 3.1 Class A
is used for vacuum degree less than or equal to 10-Pa, and the operating temperature range is generally -60 to 250°C, such as silicone rubber. 3.2 Class B
is used for vacuum degree higher than 10-3Pa, and is divided into four types according to its heat resistance and oil resistance: B-1 is generally used in the range of 50 to 80°C, with poor oil resistance, such as natural rubber; B-2 is generally used in the range of -35 to 100°C, with good oil resistance, such as nitrile rubber; B-3 is generally used in the range of -20 to 250°C, with good oil resistance, such as fluororubber; B-4, the operating temperature range is generally -30 to 140°C, with poor oil resistance, such as butyl and ethylene propylene rubber. Approved by the Ministry of Chemical Industry of the People's Republic of China on June 1, 1992. Standard damage network sEaea con Various standards industry data competitive download 1993-10-01 implementation
4 Technical requirements
HG/T2333-92
The rubber compound manufacturing and the raw materials used shall comply with the requirements of the relevant technical documents, 41
4.2 The rubber compound shall be uniform and shall not contain agglomerates and impurities larger than 0.2mm. 4.3 The manufacturing of O-rings shall comply with the requirements of relevant process documents, 4.4 The appearance quality of O-rings shall comply with the provisions of GB3452.2, 4.5 The size and tolerance of O-rings shall comply with the provisions of GB3452.1 or drawings, and the physical properties of rubber materials shall comply with the corresponding provisions in Table 1 and Table 2. 4.6
Table 1 Physical properties of Class A materials
Hardness (Shore A or IRHD), degrees
Tensile strength, MPa
Tear elongation at break, %
Compression set, B method
(200C×22h), %
Density change, mg/m
Low overflow brittleness (-60℃)
Hot air aging (250℃×70h)
Degree change (Shore A or IRHD), degrees
Tensile strength change rate decreased, %
Batch elongation change rate decreased, %
Gas release rate, 30min, Pa·L/s·cm
Table 2 Physical properties of Class B materials
Hardness (Shore A or IRHD), degrees
Tensile strength, MPa
Elongation at break, %
Compression set, B method, %
70℃×70 h
100℃×70h
125℃×70h
200℃×22h
Density change, mg/m
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No break
4×10-3
Low temperature brittleness
HG/T2333—92|| tt||Continued Table 2
No cracking at -50℃
Volume change in Vaseline (70℃×24h), %Hot air aging
Hardness change (Shore A or IRHD), degrees
Tensile strength change rate, %
Elongation at break change rate, %
Air release rate (30min) Pa·L/s·.cm25Test method||tt| |5.1 Test specimenbzxz.net
5.1.1 The preparation of the test specimen shall comply with the provisions of GB9865, reduce ≤
-35℃ without cracking
1100℃×70m
70℃×70F
-5~+10
1.5×10-3
-5~+10
1.5×10-3
-20℃ No crack
No crack at -30℃
125c×70h
250cx70h
7.5×10-*
5.1.2 Use O-ring products as much as possible, or use the same batch of rubber materials to prepare samples with the same degree of vulcanization as the product.5.2 Physical properties
5.2.1 Density is determined according to GB/T533 or GB5720. -5~+10
2×10-
5.2.2 Hardness is determined according to GB531, GB5720, GB6031 or GB6032. GB6031 and GB6032 are arbitration methods,
Tensile strength and elongation at break are determined according to GB528 or GB5720. Compression set determination shall be carried out in accordance with GB7759 or GB5720. 5.2.4
Hot air aging test shall be carried out in accordance with GB3512 or GB5720, and brittle temperature determination shall be carried out in accordance with GB1682.
Liquid resistance test shall be carried out in accordance with GB1690 or GB5720. 5.2.7
5.2.8 Gas outflow rate determination shall be carried out in accordance with Appendix A. 5.3 Appearance and size
5.3.1 The appearance of the material shall be measured by visual method or measuring tool with a graduation value of 0.02mm. 5.3.2 The size of O-ring shall be measured in accordance with GB5723. 6 Inspection rules
6.1 Factory inspection
6.1.1 The rubber materials produced by the same shift and the same machine shall be a batch of no more than 100kg. 6.1.2 The O-rings of the same specification manufactured by the same process conditions and delivered at the same time shall be a batch of more than 10,000 pieces. -6.1.3 The appearance of O-rings shall be inspected piece by piece. 6.1.4 The size of O-rings shall be sampled and inspected according to the general inspection level II and AOL value of 4 in GB2828. 6.1.5 The physical properties of each batch of materials shall be inspected before delivery according to the requirements of items 1 to 5 in Table 1 or Table 2. 6.1.6 When the appearance inspection result of O-rings fails, they can be repaired once and then re-inspected. If they still fail, they are unqualified products.
When the physical property inspection of O-rings fails, double test pieces shall be taken to re-inspect the unqualified items. If the re-inspection result still fails one item, the batch is unqualified. When the physical property inspection of rubber fails, double test pieces shall be taken to re-inspect the unqualified items. If the re-test result is unqualified, the rubber material is allowed to be conditioned once, and after conditioning, a full performance test must be carried out. If one of the items is unqualified, the batch is considered unqualified. 6.2 Type test
6.2.1 When there is a national standard GB1.3. If any of the situations a~f described in 6.6.1 is met, type inspection shall be carried out. 6.2.2 Inspection items shall be carried out in accordance with Chapter 4 of this standard. 6.2.3 The general inspection period is half a year.
6.2.4 The physical performance inspection results of the O-ring shall be used as the arbitration result. Marking, packaging, transportation and storage
7.1 The marking, packaging and transportation of materials shall be carried out in accordance with the provisions of GB5721. 7.2 The storage of materials shall be carried out in accordance with the provisions of GB5722. 7.3 Under the conditions of complying with 7.1 and 7.2, the storage period of rubber materials shall meet the following requirements: Rubber materials: 6 months.
O-ring: 6 years for Class A; 2 years for Class B-1; 3 years for Class B-2; 6 years for Class B-3; 4 years for Class B-4.
Rubber materials that have exceeded the storage period should be tested for their physical properties. If they are qualified, they can still be used. Standard A1 method principle
HG/T2333--92
Appendix A
Determination of the outgassing rate of vulcanized rubber at room temperature
(reference)
Under room temperature conditions, the vulcanized rubber sample is fully immersed in a vacuum, and the displacement of the sample is measured with a vacuum gauge. The pressure value of the sample at different positions is measured, and the outgassing rate of the material can be obtained according to the pressure difference. The vacuum resistance of the material is evaluated by the outgassing rate curve corresponding to time.
A2 Instrument
The testing instrument consists of a diffusion pump, a testing tube, a mechanical pump, a vacuum gauge, etc., as shown in Figure A1. 13
Figure A1 Vacuum outgassing rate measuring device
1- Mechanical pump;
4- Diffusion pump; 5- A large two-way valve; 6- Three-way valve; 2- Gas cylinder: 3- Booster pump:
7- Two-way valve; 8- Degassing; 9- Ground plug; 10-- Sample; 11- Measuring tube; 12- Drying bottle: 13- Vacuum gauge A3 Sample
A3.1 Sample preparation
A rectangular sample with a length of 2.00±0.05cm, a width of 0.50±0.05cm, and a thickness of 0.20±0.03cm is prepared by molding or cutting.
A3.2 Sample treatment
Place the sample in a desiccator that can maintain a humidity of about 45% and leave it at room temperature for 3 days. A3.3 Number of samples
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2~3 samples are used for each test.
A4·Test conditions
HG/T2333-92
Test temperature: 23±2℃; vacuum degree: 10-3Pa. A5 Operation procedures
A5.1 Check whether the test device has exploded and whether the circuit is intact. Turn on the constant temperature water bath to keep the test tube constant temperature. A5.2 Start the mechanical pump and use the spark leak detector to check for leaks. If normal, start the oil diffusion pump after 15 minutes until the system is pumped to a vacuum degree of 10-3Pa,
, A5.3 Turn on and adjust the vacuum gauge (operate according to the operating procedures), degas the vacuum gauge, and the degassing time is about 10 minutes. A5.4 Add gas to the test tube, put the sample in and immediately close the sample port. A5.5 First draw the test tube with the secondary line, and then use the diffusion pump to draw the test tube after 5 minutes. At this time, start the test and record the time. According to the requirements, move the sample left and right (points b and a) to record the pressure value, record once every 6 minutes, and measure continuously for 1 hour. A5.6 After the test, stop the diffusion pump, stop the mechanical pump after 10 minutes, and at the same time, expand the mechanical pump and stop the constant temperature water bath. A6 Result processing
According to the measured pressure value p, draw the p-1 curve on the double logarithmic coordinate paper. According to the given time, calculate the difference (pP). The gas outflow rate of the material is calculated according to the following formula.
In the formula: Q——gas outflow rate value, Pa·L/s·cm2-pipeline conductance, L/s;
-pressure difference when the sample is at the left and right ends, Pa; (-)
-surface area of the sample, cm2
The average value of the sample test results: (Q) is drawn on the double logarithmic coordinate paper, and the Qt curve is drawn. A7 Test Report
Standard number adopted in the test:
Test material name and number:
Sample sending unit;
Test conditions: vacuum system background value and test temperature of the sample; test results;
Test personnel;
Review personnel and date.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Dong Songlin, and Zhang Jingqin.
The main drafters of this standard are Sun Liping,
Wang Baoyong,
Standard Exchange Network.b8peo
com Various standard industry information free download
People's Republic of China
Chemical Industry Standard
Vacuum Ring Rubber Materials
HG/T2333--92
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)||tt ||Postal code: 100013
Printing Chemical Industry Ministry Standardization Research Institute
Copyright reserved. No reproduction allowed
Format 880×12301/16
Number of words per sheet 12000
First edition December 1992
First printing December 1992
Number of prints 1-500
Standards Technical Network w, b POsD.con Various standards industry information downloads for free5. First, draw the test tube with the secondary line, and then use the diffusion pump to draw the test tube after 5 minutes. At this time, start the test and record the time. According to the requirements, move the sample left and right (points b and a) to record the pressure value, record it every 6 minutes, and measure it continuously for 1 hour. A5.6. After the test, stop the diffusion pump, stop the mechanical pump after 10 minutes, and at the same time, expand the mechanical pump and stop the constant temperature water bath. A6. Result processing
According to the measured pressure value p, draw a p-1 curve on the double logarithmic coordinate paper. According to the given time, calculate the difference (pP). The gas outflow rate of the material is calculated according to the following formula.
In the formula: Q——gas outflow rate value, Pa·L/s·cm2-pipeline flow conductance, L/s;
-pressure difference when the sample is at the left and right ends, Pa; (-)
-surface area of the sample, cm2
Take the average value of the sample test results: (Q) on the double logarithmic coordinate paper and draw the Qt curve. A7 Test Report
Standard number adopted in the test:
Test material name and number:
Sample sending unit;
Test conditions: vacuum system background value and test temperature of the sample; test results;
Test personnel;
Review personnel and date.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Dong Songlin, and Zhang Jingqin.
The main drafters of this standard are Sun Liping,
Wang Baoyong,
Standard Exchange Network.b8peo
com Various standard industry information free download
People's Republic of China
Chemical Industry Standard
Vacuum Ring Rubber Materials
HG/T2333--92
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)||tt ||Postal code: 100013
Printing Chemical Industry Ministry Standardization Research Institute
Copyright reserved. No reproduction allowed
Format 880×12301/16
Number of words per sheet 12000
First edition December 1992
First printing December 1992
Number of prints 1-500
Standards Technical Network w, b POsD.con Various standards industry information downloads for free5. First, draw the test tube with the secondary line, and then use the diffusion pump to draw the test tube after 5 minutes. At this time, start the test and record the time. According to the requirements, move the sample left and right (points b and a) to record the pressure value, record it every 6 minutes, and measure it continuously for 1 hour. A5.6. After the test, stop the diffusion pump, stop the mechanical pump after 10 minutes, and at the same time, expand the mechanical pump and stop the constant temperature water bath. A6. Result processing
According to the measured pressure value p, draw a p-1 curve on the double logarithmic coordinate paper. According to the given time, calculate the difference (pP). The gas outflow rate of the material is calculated according to the following formula.
In the formula: Q——gas outflow rate value, Pa·L/s·cm2-pipeline flow conductance, L/s;
-pressure difference when the sample is at the left and right ends, Pa; (-)
-surface area of the sample, cm2
Take the average value of the sample test results: (Q) on the double logarithmic coordinate paper and draw the Qt curve. A7 Test Report
Standard number adopted in the test:
Test material name and number:
Sample sending unit;
Test conditions: vacuum system background value and test temperature of the sample; test results;
Test personnel;
Review personnel and date.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Dong Songlin, and Zhang Jingqin.
The main drafters of this standard are Sun Liping,
Wang Baoyong,
Standard Exchange Network.b8peo
com Various standard industry information free download
People's Republic of China
Chemical Industry Standard
Vacuum Ring Rubber Materials
HG/T2333--92
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)||tt ||Postal code: 100013
Printing Chemical Industry Ministry Standardization Research Institute
Copyright reserved. No reproduction allowed
Format 880×12301/16
Number of words per sheet 12000
First edition December 1992
First printing December 1992
Number of prints 1-500
Standards Technical Network w, b POsD.con Various standards industry information downloads for free
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