HG 3098-1989 Specification for preformed vulcanized rubber compression seals for concrete road expansion joints
Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber, ucanized-Preformed compression seals foruse between concrete motorway paving sections-Specification for material
HG/T3098-1989（1997）
Replaces GB10710-89
This standard is equivalent to the international standard ISO4635-1982 "Preformed vulcanized rubber compression seals for use between concrete motorway paving sections-Specification for material".
1 Subject content and scope of application
This standard specifies the performance requirements and test methods for preformed vulcanized rubber compression seals for use between concrete motorway paving sections. This standard is applicable to seals for use between concrete motorway paving sections and is not applicable to seals for use between asphalt and other structures.
This standard does not include the type and size of seals, but the dimensional tolerance of seals shall comply with the provisions of GB3672. 2 Reference standards
Determination of tensile properties of vulcanized rubber
Test method for Shore A hardness of rubber
GB1690
Test method for liquid resistance of vulcanized rubber
GB2941
GB3512
GB3672
GB5721
GB5722
GB6031
GB6032
GB7529
GB7759
GB7762
GB9865
Standard temperature, humidity and time for parking and testing of rubber specimensTest method for hot air aging of rubber
Dimensional tolerances of solid molded and extruded rubber productsRubber sealing products General provisions for marking, packaging and transportationGeneral provisions for the storage of rubber sealing products
Determination of the international hardness of vulcanized rubber (30-85IRHD)Conventional test methodDetermination of the international hardness of vulcanized rubber (30-85IRHD)Micro test methodGeneral provisions for the appearance quality of molded and extruded rubber productsDetermination of the permanent deformation of vulcanized rubber under constant deformation compression at room temperature and high temperatureOzone aging resistance test of vulcanized rubberStatic tensile test methodPreparation of vulcanized rubber samples and test specimens
Determination of the hardness of low-hardness vulcanized rubber (10-35IRHID) GB9866
3 Classification
The materials specified in this standard are divided into two categories according to their hardness, and the corresponding nominal hardness of Category I is 60 (55, 60) IRHD, and that of Category II is 70 (65, 70) IRHD.
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 21, 1989, 96
Implemented on December 1, 1989
4 Technical requirements
4.1 Materials and processes
HGIT3098-1989 (1997)
4.1.1. Seals shall be made of ozone-resistant rubber, and chloroprene rubber is recommended. The ozone resistance of the material shall not rely solely on spraying anti-ozone coating.
All raw materials used to make rubber compounds shall comply with the requirements of relevant technical specifications. 4.1.3 The sealing surface of the seal shall be free of micropores, obvious surface defects and irregular sizes visible to the naked eye. 4.1.4 The material shall be black. If other colored materials are used, their physical properties shall comply with the requirements of this standard. 4.2 Performance requirements
The physical properties of the vulcanized rubber or finished seals used to make seals shall comply with the provisions of the following table.
Nominal hardness (IRHD)
Nominal hardness tolerance
Tensile strength
Elongation at break
Compression set (100℃×22h)
Aging resistance (after hot air aging at 100℃×72h): Hardness change (IRHD)
Tensile strength change
Elongation at break change
Ozone resistance (at 20% elongation, 40℃×96h): General conditions, ozone concentration 50p phm
Harsh conditions\: Ozone concentration 200pphm
Hardness after -10C×7d (IRHD) increase Water resistance:
Volume change after standard room temperature×7d
Compression recovery rate of finished seal
(Compression rate 50%)
-10℃×72h
-25×22h
100℃×72h
Note: 1) Whether this test is necessary can be agreed upon by both the supplier and the buyer. Single
(55, 60)
(65, 70)
No cracking
5 Test method
HG/T3098-1989(1997)
The specimens used in the following tests should be cut from the finished seal as much as possible. When it is not possible to cut the specimen from the finished product, a suitable specimen should be prepared from the same batch of rubber materials used to produce the seals, using process conditions equivalent to those used to produce the seals. 5.1 Hardness should be measured according to GB6031, GB6032 or GB5311. 5.2 Tensile strength and elongation at break should be measured using a Type 2 sub-bell-shaped test piece in accordance with the method specified in GB528. 5.3 Compression permanent deformation should be measured using a Type B specimen in accordance with the method specified in GB7759. 5.4 Hardness, tensile strength and elongation at break after hot air aging should be measured in accordance with the method specified in GB3512. 5.5 Ozone resistance should be measured in accordance with the method specified in GB7762. It is recommended that low-temperature hardness change performance be measured in accordance with the method specified in Appendix A2). 5.6
Water resistance should be measured in accordance with the method specified in GB1690. 5.7
5.8 The compression recovery rate of finished seals shall be determined by referring to the method specified in Appendix B36
Inspection rules
6.1 The appearance of seals shall be inspected in accordance with the relevant provisions of GB7529. 6.2 The dimensions of seals shall comply with the provisions of drawings or contracts, and their tolerances shall be inspected in accordance with the relevant provisions of GB3672. 6.3 The inspection items, inspection cycles, and sampling procedures during inspection shall be determined by negotiation between the supply and demand parties. 7 Marking, packaging, transportation, purchase and storage
7.1 Marking, packaging and transportation shall comply with the provisions of GB5721. 7.2 Storage shall comply with the provisions of GB5722.
Instructions for use:
1] Before the international hardness test method is popularized in China, this standard also allows the use of the Shore A hardness test method. Its hardness index and tolerance requirements are consistent.
2) Determination of low temperature hardness change. At present, there is no determination method corresponding to the international standard ISO3387 in China. According to the provisions of relevant national standards, it is recommended to determine it according to the method specified in Appendix A.
3) It is tentatively designated as an optional test and is only carried out when the identification test and the purchaser clearly require it. 98
HG/T3098-1989（1997）
Appendix A
Determination of the crystallization effect of rubber by hardness measurement method (reference)
This method specifies the determination of the effect of gradual hardening of rubber due to crystallization over time by hardness measurement method at low temperature. Al principle
Measure the increase in hardness of the rubber sample after a certain period of time at a specified low temperature and the time required for the hardness to increase to the specified value, so as to determine its crystallization effect.
A2 Test instrument
A2.1 Low temperature box can maintain the specified temperature within ±1C. A2.2 The hardness tester shall comply with the provisions of GB6031 and GB9866. A3 Test specimen
A3.1 The thickness of the standard test specimen is 8-10mm, and the thickness of the non-standard test specimen can be thicker or thinner, but when the instrument specified in GB6031 or GB9866 is used, the thickness of the test specimen shall not be less than 6mm. A3.2 Preparation of test specimens Prepare the vulcanized rubber test specimens in accordance with the provisions of GB9865. In order to obtain the required thickness, it is allowed to stack two films (but not more than two films), and the film surfaces should be flat and parallel to each other. A3.3 The time interval between the parking, vulcanization and testing of the test specimen is 16h. A4 Test steps
A4.1 Place the hardness tester and forging in a low-temperature box at the specified temperature for at least 60min. Place the test specimen in the low-temperature box at the specified temperature, wait for 15±1min, pick up the test specimen with tweezers, and measure the hardness in accordance with the provisions of GB6031 or GB9866. The measuring points should be distributed at three or five different positions on the test specimen. The distance between each measuring point should be at least 4 mm. The median of the results is taken as the initial hardness. A4.2 After the sample is left at the test temperature for a specified time, press A4.1 Repeat the hardness measurement. A5 Test temperature and test cycle
A5.1 The test temperature is one of the following temperatures: 0±1℃
-10±1℃
-25±1℃
-40±1℃
-55±1℃
-70±1℃
A5.2 The test cycle is usually measured after 24-8.sh and 168-2h of parking at the test temperature. In order to make a hardness-time relationship curve, the hardness can be measured after 48h and 96h of parking. If the hardness measured after 24-8,h increases by more than 10IRHD compared to the initial hardness, the hardness can be measured after 1, 2, 4, or 8h as appropriate.
A6 Representation of test resultswwW.bzxz.Net
Calculate the difference between the initial hardness and the hardness after 168-9h of parking as the test result. Or draw the corresponding hardness-time logarithmic relationship curve, and obtain the hardness increase value within the specified time at the test temperature as the test result. 99
B1 Test piece
HG/T3098-19S9 (1997)
Appendix B
Determination of compression recovery rate
(reference)
A 125mm long test piece should be cut from the finished seal, and each test piece can only be used once. When conducting low temperature tests, talcum powder can be sprinkled on the test piece.
B2 Procedure
The test is carried out in accordance with GB7759, but the following points need to be added: B2.1 The presser foot is aligned with the measurement position marked on the test piece and the top longitudinal edge, and the width of the middle of the test piece is measured to ensure that the measurement is at the same position before and after compression.
B2.2 Before compression, place the test piece horizontally so that the plane passing through the two sides of the top surface of the seal is perpendicular to the compression plate. When the test piece is compressed, the top surface of the seal should be folded inward toward the center of the test piece. Compress to 50% of the original width. B2.3 In the ~10 test, place the fixture assembly with the compressed test piece in a low temperature box and keep it at -10℃ for 72 hours. Then, release the test piece and let it recover at -10℃ for 1 hour, and measure the width after recovery. B2.4 In the -25℃ test, place the fixture assembly with the compressed test piece in a low temperature box and keep it at -25℃ for 24 hours. Then, release the test piece and let it recover at -25℃ for 1 hour, and measure the width after recovery. B2.5 In the 100℃ test, place the fixture assembly with the compressed test piece in an oven and keep it at 100℃ for 72 hours. Do not preheat the fixture assembly. Release the test piece and let it cool on a wooden board at standard laboratory temperature for 1 hour, and measure the width after recovery. B3 Calculation
Calculate the compression recovery rate R of the test piece by the following formula, expressed as a percentage: R
W—the original width;
W—the width after recovery.
Additional instructions:
This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Huang Zuchang and Li Wenhu. .100.
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