HG/T 3091-2000 Rubber seals Specification for interface sealing ring materials for water supply, drainage and sewage pipes
Some standard content:
ICS83.140.50
Registration No.:7268-2000
Chemical Industry Standard of the People's Republic of China
HG/T 3091-2000
idtIS04633:1996
Rubber sealsJoint rings for water supply,drainage and seweragepipelines--Specification for materials2000-05-23Release
2000-12-01Implementation
Release by the State Administration of Petroleum and Chemical IndustrywwW.bzxz.Net
HG/T 3091-- 2000
This standard is a revision of the chemical industry standard HG/T3091-1988 by adopting the international standard TS) 4633:1966^Rubber seals--Interface seals for water supply, drainage pipes and sewage pipes. The main differences of this standard HG/T3091-1988 are: 1. The name of the rubber seal for water supply and drainage pipes is changed to the current name. …- Added "Sealing rings and composite sealing rings for cold drinking water supply pipes (less than 50)", and specified the identification code of the sealing ring. -~ Added "72h×(-10) compression permanent deformation" and "ozone resistance" two basic requirements and "72h×(-25) sub-shrinkage permanent deformation" and "volume change in oil" two optional requirements. Added S appendices (see Appendix A, B, C, D and E). From the date of implementation, this standard will replace HC/T3091--1988. Appendices A and B of this standard are the appendices of the standard, and Appendix C, L and E This is a suggested appendix. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Rubber Standardization Committee's Sealing Products Technical Committee. The responsible drafting unit of this standard: Northwest Rubber and Plastic Research and Design Institute. The participating drafting units of this standard: Gaodao Rubber Products Factory, Suzhou Fourth Rubber Factory, Xi'an Hongqi Cement Products Factory. The main drafters of this standard: Huang Zuchang, Luo Xiangdong, He Bin, Wang Yangmin, Gao Jingru. This standard was first issued as the national standard GB/T9876-88 in 1988 and adjusted to the chemical industry standard in 1997. The number is IG/r 3091--1988.
ISO (International Organization for Standardization) is a global organization of national standardization groups (ISO(R) member groups). The work of formulating international standards is usually carried out by ISO technical committees. Any member group interested in the items for which a technical committee has been established has the right to participate in the committee. Governmental or non-governmental organizations associated with ISO also have the right to participate in this work. ISO Maintain close liaison with the International Electrotechnical Organization (IEC) on all matters of electrotechnical standardization.
Draft international standards adopted by the technical committee are circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of the member bodies voting.
This standard ISO4G33 was prepared by ISO/TC45 Rubber and Rubber Products Technical Committee, SC4 Miscellaneous Products Section. This edition has been technically revised and replaces and annexes A and D of the first edition (IS04633:1983) and constitutes an integral part of this standard. Appendices C, D and E are the appendices of the suggestion. 1
Citation Standard
Quality Assurance
Identification Code
Marking and Labeling·
Appendix A (Appendix of Standard)
Appendix B (Appendix of Standard)
Appendix C (Appendix of Suggestion)
Appendix D (Appendix of Suggestion)
Appendix E (Appendix of Suggestion)
Determination of Tensile Stress Relaxation
Determination of Joint Strength
Quality Assurance
Guide to Storage of Sealing Rings
Chemical Industry Standard of the People's Republic of China
Rubber seals-Joint rings for water supply, drainage and sewerage pipelines-Specification for Materials1 Scope
This standard specifies the requirements for vulcanized rubber sealing ring materials for the following pipes: a) Cold drinking water supply pipes (less than 50°C). HG/T 3091-2000
idt Is0 4633: 1996
Replacement HG/3091-1988 (1997)
) Drainage pipes, sewage pipes and rainwater pipes (for continuous flowing water, the working temperature is less than 45°C; for intermittent flowing water, the working temperature can reach 95°C).
The identification codes of various sealing rings specified in this standard are determined according to the type, purpose and requirements of the sealing ring (see Table 3). This standard also specifies general requirements for finished sealing rings. Additional requirements for special purposes should be specified in the corresponding product standards. It should be noted that the working performance of the pipe interface is related to the performance of the sealing ring material, the geometric shape of the sealing ring and the structure of the pipe interface. If applicable, this standard should be used together with the product standards that specify the working performance of the pipe interface. This standard applies to all pipe interface seals including cast iron pipes, steel pipes, porcelain pipes, asbestos cement pipes, cement pipes, reinforced cement pipes, plastic pipes and glass fiber reinforced plastic pipes. This standard applies to the elastomer part of composite or non-composite rubber seals. For composite seals with a hardness range of 76 to 95 IRHI, the requirements of elongation at break, compression set and stress relaxation are only used when the rubber is directly involved in the seal or the seal is required to be stable for a long time.
Interface seals made of closed-cell materials as part of the seal also fall within the scope of this standard. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T528-1998 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber (egVISO37:1994) GB/T1685-1989 Determination of compressive stress relaxation of vulcanized rubber at room temperature and elevated temperature GB/T 1690-1992 Test method for liquid resistance of vulcanized rubber (neg1sO1817:1985) GB/I3512-1989 Test method for hot air aging of rubber GB/T3672-1992 Dimensional tolerances of molded, extruded and calendered solid rubber products (eqV1SO33021988) GB/T5576-1997 Rubber and latex nomenclature (idt ISO1629:1995) GB/T 6031—1998
Vulcanized rubber or thermoplastic rubber Determination of hardness 10100IRHD) (id1ISO481994) GB/T 7759—1996
Vulcanized rubber or thermoplastic rubber Determination of compression set at room temperature, high temperature and low temperature (eqv ISO 815:1991)
GB/T7762—1987
Vulcanized rubber ozone aging resistance test static tensile test method Approved by the State Administration of Petroleum and Chemical Industry on May 23, 2000, implemented on December 1, 2000
HG/T 3091-2000
GB/T9865-1996 Vulcanized rubber or thermoplastic rubber samples and test pieces Part 1: Physical tests (id1IS) 4661-111993)
GB/T12832-1991 Rubber Determination of crystallization effect Hardness measurement method (eqV1SO3387:1978) GB/T176041998 Recommendations for manufacturing quality of joint seals for rubber pipes Classification and categories of defects (id1IS) 96911992)
ISO2285:1997 Vulcanized rubber or thermoplastic rubber - Determination of tensile deformation at room and elevated temperatures 3 Classification
6 types of joint seals for pipes are specified in Table 2, and 3 types are specified in Table 3. The nominal hardness of the material should be within the range specified in Table 1. Table 1 Hardness classification
Iodine grade
Degree range, RHD
4 Requirements
4.1 Material requirements
4.1.1 General
The material should not contain any sealing ring for the fluid being transported,The elastomer part of the composite seal ring does not need to meet the requirements of 4.1.2 if it is not in direct contact with the fluid in the pipe. 4.1.2 Impact on water quality
When conveying cold water, the material should not damage the water quality under the conditions of use. The material should comply with the provisions of the relevant national standards 4.1.3 Microbial damage
If there is such a requirement in the actual application, the material should be resistant to microbial damage. The test methods and requirements should comply with the provisions of the relevant national standards.
4.2 Requirements for finished seal rings
4.2.1 Dimensional tolerance
The tolerance should be consistent with the tolerance grade specified in GB/T3672. 4.2.2 Defects and imperfections
The seal ring should be free of defects or irregularities that may affect its function. Defects should be classified as follows according to GB/T17604: Surface defects on the sealing working surface, as described in 4.1,1 of GB/T17604, should be considered as defects. -Surface defects on the non-sealing working surface, as described in 4.1.2.1b) of GB/T17604, shall not be considered as defects. Serious surface defects on the non-sealing working surface, as described in 4.1.2.1a) of GB/T17604, may be considered as defects. This should be determined by negotiation between the two parties concerned. The qualified quality standard is related to the type and structure of the sealing ring. Internal defects described in 4-2 of GB/T17604 may be considered as defects. (The compression force described in B/T17604 can be measured in accordance with GB/T7757 (see Appendix E). The allowable limit value of the compression force shall be determined by negotiation between the relevant parties based on the type and structure of the sealing ring. 4.2.3 Hardness
When measured by the micro-test method specified in GB/T6031, the hardness shall meet the requirements specified in Table 2. 6
HG/T 3091-2000
Table 2 Physical properties requirements for materials for cold water supply pipes, drainage pipes, sewage pipes and rainwater pipes WA, WC, WG type (see Table 3)
Nominal hardness allowable error
Tensile strength, minimum
Elongation at break, minimum
Compression permanent deformation, maximum
72 hx23 c.
24hx70℃
72h×(10)℃
Hot air aging 7×70℃
Hardness change, maximum/minimum
Tensile strength change, maximum
Elongation at break change, maximum/minimum
Stress relaxation, maximum
7 dX23℃
100d×23C
Stress relaxation of each pair of tens of time, maximum volume change in water, maximum/minimum
7dx70c
Ozone resistance
Optional requirements
Compression permanent deformation, maximum
72 h×(-25)C
Death change, maximum
168 h×(—25)℃
Volume change in oil
72 h×70℃
1\Oil, max/min
3°Oil, max/min
Test method
GB/TG031
GB/T 528
GB/T528
GB/T 7759
GB/T 3512
GB/T 528
GB/T528
GB/T 1685
GB/T1G90
GB/T 7762
GB/T 7759
GB/T 7759
GB/T12832
Chapter number
4. 2. 5. 2
1. 2. 5. 2
4. 2. 5. 3
Requirements for each hardness grade
No cracks can be seen when observed without magnification. GO
±50 |= 50
If the size of the sealing ring is appropriate, the conventional test method specified in GB/T6031 can also be used, but the micro test method must be used as a reference.
For the same sealing ring or the sealing ring cut along the maximum length of the extruded profile, the difference between the minimum hardness and the maximum hardness should not exceed 5 IRHD, and each hardness value should be within the specified error range. 4.2.4 Tensile strength and elongation at break
Tensile strength and elongation at break shall be measured using dumbbell-shaped test specimens of type 1.2.3 or 4 in accordance with the method specified in GB/T528. Type 2 test specimens are preferred. If type 2 test specimens are not used, the other dumbbell-shaped test specimens used shall be indicated in the test report. Tensile strength and elongation at break shall meet the requirements shown in Table 2.
4.2.5 Compression set in air
4.2.5.1 General
If the test specimen is taken from the seal drawing, it shall be measured in the compression direction of the seal ring in use as far as possible. 4.2.5.2 Compression set at 23℃ and 70℃ When measured at 23℃ and 70℃ using type B test specimens according to the method specified in GB/T7759, the compression set shall meet the requirements shown in Table 27.
HG/T 3091--2000
If the cross-section of the product is too small to cut a compression test specimen from the product, the tensile set of the seal may be measured at 50% strain using the same test conditions (except strain) and requirements as for the compression set, but molded compression test specimens are not required.
4.2.5.3 Low temperature compression set at 10℃ When measured at -10℃ using type B test specimens and a recovery time of (30±3) min according to the method specified in GB/T7759, the low temperature compression set shall meet the requirements shown in Table 2. 4.2.6 Accelerated aging in air
The test specimens prepared for the determination of hardness (see 2.3) and the determination of tensile strength and elongation at break (see 4.2.4) shall be aged in hot air at 70°C for 7 days according to the conventional oven method specified in GB/T 3512. The changes in hardness, tensile strength and elongation at break shall comply with the requirements specified in Table 2. 4.2.7 Compressive stress relaxation
Compressive stress relaxation shall be determined according to GB/T 1685, method A, using cylindrical test specimens that have been mechanically and thermally treated. For the 7-day test, the measured values at 3 h, 1 d, 3 d and 7 d shall be recorded; for the 100-day test, the measured values at 3 h, 1 d, 3 d, 7 d, 30 d and 100 d shall be recorded. The best fitting straight line is drawn by regression analysis using logarithmic time coordinates. The 7 d and 100 d compressive stress relaxation requirements given in Table 2 are derived from this straight line. The compressive stress relaxation measured at the following temperatures and times shall meet the requirements specified in Table 2: Cold water supply pipe interface seal ring
Drain pipe, sewage pipe and rainwater pipe system
23℃: ×7 d
23'C: X100 d
The 100 d test shall be regarded as a type test. The stress relaxation requirements corresponding to each decimal time shall also be regarded as type test requirements.
If the sample is taken from the sealing ring, it should be measured in the compression direction of the sealing ring in use as much as possible. If the cross-section of the product is too small to cut a compression sample from the product, the tensile stress relaxation of the sealing ring can be measured according to the method specified in Appendix A under the same requirements as the measurement of compressive stress relaxation, without the need for molding compression samples. 4.2.8 Volume change in water
When measured according to the method specified in GB/T 1690, the volume change after immersion in distilled water or deionized water at 70°C for 7 days shall meet the requirements specified in Table 2.
4.2.9 Ozone resistance
When tested under the following conditions according to the method specified in GB/T 7762, the ozone resistance of the vulcanized rubber seal in contact with the pipe or pipe fittings shall comply with the requirements specified in Table 2:
Ozone concentration: (50±5)pphm
Temperature: (40±2)℃
Pre-stretching time: (72°)h
Exposure time: (18°)h
Pre-stretching rate:
36-75 IRHD(20±2)%
76~～85 1RHD(15±2)%
86~95 IRHD (10 ± 1)%
Relative humidity: (55 + 10)%
Protected or separately wrapped lemon glue sealing components should meet the requirements of the phases before installation and use, but the test uses the concentration of (25 ± 5) pphm.
Note 1) IS) 22851997. For the translation of the standard, see Special Rubber Products\, 2000.No5. 8
4.2.10 Overlap joints at the ends of precured rubber profiles 4.2.10.1 Joints
These joints shall be vulcanized.
4.2. 10. 2 Joint strength
HG/T 3091—2000
When tested according to the method specified in Appendix B, no separation shall be observed at the cross section of the joint when observed without magnification.
4.3 Optional requirements
4.3.1 Low temperature properties at -25°C
When measured according to the method specified in GB/T7759, the compression set at -25°C shall conform to the requirements specified in Table 2. 4.3.2 Volume change in oil
Oil resistance shall be measured according to the method specified in GB/T1690. The volume change of the sample should be measured after soaking in 70 (1 and 3\ standard oils for 72 hours. The volume change in oil should meet the requirements specified in Table 2. 5 Tests
5.1 Preparation of samples
Unless otherwise specified, the samples should be cut from the finished products according to the method specified in GB/T9865. If suitable samples cannot be prepared according to the instructions given in the relevant test methods, the samples should be cut from the same batch of mixed rubber used to make the sealing ring and from the rubber plates or films of suitable size molded under the same conditions as those used to produce the sealing ring. For tests that allow the use of samples of different specifications, each batch of products and any comparative tests should use samples of the same specifications. 5.2 Test temperature
Unless otherwise specified, the samples should be cut from the finished products according to the method specified in GB/T9865. If suitable samples cannot be prepared according to the instructions given in the relevant test methods, the samples should be cut from the same batch of mixed rubber used to make the sealing ring and from the rubber plates or films of suitable sizes molded under the same conditions as those used to produce the sealing ring. For tests that allow the use of samples of different specifications, each batch of products and any comparative tests should use samples of the same specifications. 5.2 Test temperature
Unless otherwise specified, the samples should be cut from the finished products according to the method specified in GB/T9865. If otherwise specified, the test shall be carried out at (23 ± 2) °C. 6 Quality assurance
Quality assurance tests do not form part of the main text of this standard, but guidance can be obtained from Appendix C, which recommends appropriate test cycles, product control tests and sampling techniques. The quality assurance provisions shall be consistent with GB/T19002-1994 (see Appendix C). 7 Compensation
See Appendix D.
8 Identification code
Elastomeric sealing rings for pipelines shall be identified according to their intended use as listed in Table 3. The complete identification code shall consist of the following: a) Category, such as "O\ shape
b) Number of this standard, i.e. HG/T3091
c) Nominal size, such as DN 150
d) Application type, such as WA (see Table 3)
c) Rubber type, such as S3R (see GB/T5576)f) Interface seal ring name, such as the manufacturer's product name Example "0\ ring/HG/T3091/DN150/WA/SBR/Product name WA
HG/T 3091--2000
Table 3 Identification codes for elastomer seal rings determined by type, purpose and requirements
Cold drinking water supply pipe (below 50°C)
Non-drinking cold water supply pipe, drain pipe, sewage pipe and rainwater pipe (continuous flow below 45°C and intermittent flow below 95°C)
Non-drinking cold water supply pipe, drain pipe, sewage pipe and rainwater pipe (continuous flow below 45°C and intermittent flow below 95°C and oil resistant)
9 Marking and labeling
Impact on water quality
Rate, strip
Each sealing ring or each packaging bag of bagged sealing rings that should not be marked on the sealing ring should be clearly and firmly marked with the following marks in a way that does not impair the sealing ability:
a) Nominal size;
b) Manufacturer's identification mark;
c) This standard number and the following application type and hardness grade, such as HG/T3091/WA/50; d) Third-party certification mark;
e) Production: Date: Season, Year, such as 4Q1998; f) If the sealing ring is actually low-temperature, it should be marked with (L), such as WAL; more) If the sealing ring is actually oil-resistant, it should be marked with (O), such as WCO; h) The abbreviation of the rubber type, such as SBR (see GB/T5576). 10
A1 Principle
HG/T 3091—2000
Appendix A
(Standard Appendix)
Determination of tensile stress relaxation
Measure the stress of a fixed tensile length specimen during the entire test period. A2 Instrument
A2.1 Stress instrument (see Figure A1): It contains two clamps that hold the specimen so that the specimen maintains a fixed tensile length and does not slip. The clamps should be installed in a way that the stress of the specimen can be determined, such as by combining it with a tension tester. A2.2 Force measuring system: It can be accurate and stable to within 2% of the tensile reading. A3 Specimen
Cut a strip specimen with two parallel sides from the finished seal. The dimensions of the specimen are as follows: Thickness: 1~2mm.
Width: 4~10 rm.
Length: (80 ± 1) mm twice the length of the fixture Three specimens are used for each test.
A4 Test conditions
The test should be carried out at the temperature given in 4.2.7. A5 Procedure
Mount the specimen in the fixture without strain. Within 1 min, stretch the specimen to an elongation between 5% and 55%. Maintain this elongation throughout the test. Measure the initial force after the specimen is stretched for (30 ± 0.5) min. Measure the tensile force at other times specified in 4.2.7. If a strain gauge as shown in Figure A1 is used, it can be connected to a tensile testing machine. The upper fixture is placed away from the support screw by loosening the knurled screw or applying additional strain, and the measured force is recorded. No matter which method is used, the deviation of the reading should not exceed 0.2 mm. After measuring the tensile force, return to the initial strain, remove the strain gauge from the tensile testing machine and put it aside. 11
Connection ring of connection testing machine
Dredge conch
Tensile test piece
HG/T 3091-2000
Figure A1 Schematic diagram of tensile stress relaxation tester (the dimensions in the figure are for reference only)
Dimensions: mmHowever, guidance can be obtained from Appendix C, which recommends appropriate test cycles, product control tests and sampling techniques. Quality assurance regulations should be consistent with GB/T19002-1994 (see Appendix C). 7 Compensation
See Appendix D.
8 Identification code
Elastomer seals for pipelines should be identified according to the intended use listed in Table 3. The complete identification code shall consist of the following: a) Category, such as “O-ring/HG/T3091/DN150/WA/SBR/Trade name WA/tt/HG/T 3091--2000/tt/| Table 3 Identification codes for elastomeric sealing rings determined by type, purpose and requirements
Cold drinking water supply pipes (below 50C)
Non-potable cold water supply pipes, drainage pipes, sewage pipes and rainwater pipes (45 Continuous flow below 45°C and intermittent flow below 95°C
Non-potable cold water supply pipes, drainage pipes, sewage pipes and rainwater pipes (continuous flow below 45°C and intermittent flow below 95°C and oil resistant)
9 Marking and labeling
Impact on water quality
Rate, strip
Each sealing ring or each packaging bag of bagged sealing rings that should not be marked on the sealing ring should be clearly and firmly marked with the following marks in a way that does not impair the sealing ability:
a) Nominal size;
b) Manufacturer's identification mark;
c) This standard number and the following application type and hardness grade, such as HG/T3091/WA/50; d) Third-party certification mark;
e) Production: Date: Season, Year, such as 4Q1998; f) If the sealing ring is actually low-temperature, it should be marked with (L), such as WAL; more) If the sealing ring is actually oil-resistant, it should be marked with (O), such as WCO; h) The abbreviation of the rubber type, such as SBR (see GB/T5576). 10
A1 Principle
HG/T 3091—2000
Appendix A
(Standard Appendix)
Determination of tensile stress relaxation
Measure the stress of a fixed tensile length specimen during the entire test period. A2 Instrument
A2.1 Stress instrument (see Figure A1): It contains two clamps that hold the specimen so that the specimen maintains a fixed tensile length and does not slip. The clamps should be installed in a way that the stress of the specimen can be determined, such as by combining it with a tension tester. A2.2 Force measuring system: It can be accurate and stable to within 2% of the tensile reading. A3 Specimen
Cut a strip specimen with two parallel sides from the finished seal. The dimensions of the specimen are as follows: Thickness: 1~2mm.
Width: 4~10 rm.
Length: (80 ± 1) mm twice the length of the fixture Three specimens are used for each test.
A4 Test conditions
The test should be carried out at the temperature given in 4.2.7. A5 Procedure
Mount the specimen in the fixture without strain. Within 1 min, stretch the specimen to an elongation between 5% and 55%. Maintain this elongation throughout the test. Measure the initial force after the specimen is stretched for (30 ± 0.5) min. Measure the tensile force at other times specified in 4.2.7. If a strain gauge as shown in Figure A1 is used, it can be connected to a tensile testing machine. The upper fixture is placed away from the support screw by loosening the knurled screw or applying additional strain, and the measured force is recorded. Regardless of the method used, the deviation of the reading should not exceed 0.2 mm. After measuring the tensile force, return to the initial strain, remove the strain gauge from the tensile testing machine and set it aside. 11
Connection ring of connection testing machine
Dredge conch
Tensile test piece
HG/T 3091-2000
Figure A1 Schematic diagram of tensile stress relaxation tester (the dimensions in the figure are for reference only)
Dimensions: mmHowever, guidance can be obtained from Appendix C, which recommends appropriate test cycles, product control tests and sampling techniques. Quality assurance regulations should be consistent with GB/T19002-1994 (see Appendix C). 7 Compensation
See Appendix D.
8 Identification code
Elastomer seals for pipelines should be identified according to the intended use listed in Table 3. The complete identification code shall consist of the following: a) Category, such as “O-ring/HG/T3091/DN150/WA/SBR/Trade name WA/tt/HG/T 3091--2000/tt/| Table 3 Identification codes for elastomeric sealing rings determined by type, purpose and requirements
Cold drinking water supply pipes (below 50C)
Non-potable cold water supply pipes, drainage pipes, sewage pipes and rainwater pipes (45 Continuous flow below 45°C and intermittent flow below 95°C
Non-potable cold water supply pipes, drainage pipes, sewage pipes and rainwater pipes (continuous flow below 45°C and intermittent flow below 95°C and oil resistant)
9 Marking and labeling
Impact on water quality
Rate, strip
Each sealing ring or each packaging bag of bagged sealing rings that should not be marked on the sealing ring should be clearly and firmly marked with the following marks in a way that does not impair the sealing ability:
a) Nominal size;
b) Manufacturer's identification mark;
c) This standard number and the following application type and hardness grade, such as HG/T3091/WA/50; d) Third-party certification mark;
e) Production: Date: Season, Year, such as 4Q1998; f) If the sealing ring is actually low-temperature, it should be marked with (L), such as WAL; more) If the sealing ring is actually oil-resistant, it should be marked with (O), such as WCO; h) The abbreviation of the rubber type, such as SBR (see GB/T5576). 10
A1 Principle
HG/T 3091—2000
Appendix A
(Standard Appendix)
Determination of tensile stress relaxation
Measure the stress of a fixed tensile length specimen during the entire test period. A2 Instrument
A2.1 Stress instrument (see Figure A1): It contains two clamps that hold the specimen so that the specimen maintains a fixed tensile length and does not slip. The clamps should be installed in a way that the stress of the specimen can be determined, such as by combining it with a tension tester. A2.2 Force measuring system: It can be accurate and stable to within 2% of the tensile reading. A3 Specimen
Cut a strip specimen with two parallel sides from the finished seal. The dimensions of the specimen are as follows: Thickness: 1~2mm.
Width: 4~10 rm.
Length: (80 ± 1) mm twice the length of the fixture Three specimens are used for each test.
A4 Test conditions
The test should be carried out at the temperature given in 4.2.7. A5 Procedure
Mount the specimen in the fixture without strain. Within 1 min, stretch the specimen to an elongation between 5% and 55%. Maintain this elongation throughout the test. Measure the initial force after the specimen is stretched for (30 ± 0.5) min. Measure the tensile force at other times specified in 4.2.7. If a strain gauge as shown in Figure A1 is used, it can be connected to a tensile testing machine. The upper fixture is placed away from the support screw by loosening the knurled screw or applying additional strain, and the measured force is recorded. Regardless of the method used, the deviation of the reading should not exceed 0.2 mm. After measuring the tensile force, return to the initial strain, remove the strain gauge from the tensile testing machine and set it aside. 11
Connection ring of connection testing machine
Dredge conch
Tensile test piece
HG/T 3091-2000
Figure A1 Schematic diagram of tensile stress relaxation tester (the dimensions in the figure are for reference only)
Dimensions: mm
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