Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber Guards for Automobile Hydraulic Brake Cylinders
1 Subject Content and Scope of Application
HG/T2578--94
This standard specifies the material classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for rubber guards for automobile hydraulic brake cylinders using non-petroleum-based brake fluids. This standard applies to rubber guards for automobile hydraulic brake cylinders using non-petroleum-based brake fluids, and also to guards for clutch hydraulic cylinders. This standard does not apply to brake cylinder guards for petroleum-based brake fluids. 2 Reference standards
GB/T528
3 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T529
GB/T531
GB1682
Determination of tear strength of vulcanized rubber (trouser-shaped, rectangular and crescent-shaped test specimens) Test method for Shore A hardness of vulcanized rubber
Test method for brittle temperature of vulcanized rubber
GB/T1690 Test method for liquid resistance of vulcanized rubber GB 2828
GB2941
GB3512
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)Standard temperature, humidity and time for environmental conditioning and testing of rubber specimensRubber hot air aging test method
GB/T3672
GB/T5721
GB/T5723
GB6032
GB7524
GB7529
GB7759
GB7762
GB9865
GB10830
Dimensional tolerances for molded, extruded and calendered solid rubber products. General provisions for marking, packaging, transportation and storage of rubber sealing products. Determination of dimensions of test specimens and products for testing vulcanized rubber or thermoplastic rubber. Determination of the international hardness of vulcanized rubber (30-85 IRHD) Micro test method for automotive hydraulic brake rubber cups||t t||General provisions for the appearance quality of molded and extruded rubber productsDetermination of permanent deformation of vulcanized rubber under constant deformation compression at room temperature and high temperatureTest method for ozone aging resistance of vulcanized rubberStatic tensile test methodPreparation of vulcanized rubber samples and test specimens
Technical conditions for the use of automobile brake fluid
HG/T2196
3 Classification
3.1 Category
Rubber materials for motor vehicles
Automobile hydraulic brake cylinders are divided into master cylinders and wheel cylinders. Wheel cylinders are divided into drum type and disc type, and the working conditions of the rubber shields used are different. The applicable temperature of shield rubber materials is divided into three categories, listed in Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on February 9, 1994 308
Implemented on January 1, 1995
Rubber materials
BA5464
BA6464
CA5464
CA6464
DA5363
DA6363
Note: The material codes in Table 1 are in accordance with the provisions of HG/T2196. 3.2 Marking
HG/T2578-94
Material category
Maximum operating temperature
3.2.1 The rubber materials for the shield are expressed in characters in the order of "code, standard number".
Master cylinder, drum brake
Master cylinder, wheel cylinder, drum and disc brake wheel cylinder, disc brake
3.2.2 The shield shall be marked with characters according to "part number, specification (lock diameter, free height, aperture), standard number", or agreed upon by the supplier and the buyer.
4 Technical requirements
4.1 Physical and chemical properties
4.1.1 The properties of the rubber material used for the shield shall meet the requirements of Table 2. Table 2 Rubber properties
Hardness, Shore A or IRHD
Tensile strength, MPa, not less than
Elongation at break, %, not less than
Compression set (Type A specimen)
%, not greater than
Tear strength (Rectangular specimen) kN/m, not less than Hot air aging:
Hardness change, Shore A or IRHD
Tensile strength change rate, %, not greater than
Elongation at break Change rate, %, not more than
Brake fluid resistance:
Brake fluid model 1)
Hardness change, Shore A or IRHD
Tensile strength change rate, %, not more than
Elongation at break change rate, %, not more than
Volume change rate, %
BA5464
BA6464
100℃×22h
100℃×70h
100℃×70h
10～+10
-10～+15
Material code
CA5464
CA6464
50±5 or 60±5
120 ℃×22h
120℃×70h
120℃.×70h
-10～+10
10～+15
DA5363
DA6363| |tt||150℃×22h
150℃×70h
0～+10
150C×70h
-10～+10
-10～+15
Low temperature brittleness, C
Ozone resistance test: 2
Appearance state
HG/T2578-94
Continued Table 2
Note: 1) Other types of brake fluid can be used upon agreement between the supplier and the buyer. 2) The control of this item shall be agreed upon by the supplier and the buyer. 4.1.2 The performance of the finished shield shall meet the requirements of Table 3. Table 3
Hardness, IRHD
Hot air aging:
Hardness change, IRHD
State change
Brake fluid resistance:
Brake fluid model\
Hardness change
Volume change rate, %
State change
High temperature action test:
After the test StatebZxz.net
Low temperature action test:
State after test
Low temperature bending test:
Appearance state
Expansion deformation test:
Deformation, %, not more than
Oxygen resistance test; 2)
Appearance state
Water resistance test;
State after test
Note: 1) Other types of brake fluid can be used after agreement between the supply and demand parties. 2) and 3) The control of the project shall be agreed upon by the supply and demand parties. 4.2 Appearance quality
Product performance
100℃×70h
-5～+10
BA5464
BA6464
45, no crack
Material code
CA5464
CA6464
45, no crack
DA5363
DA6363
45, no crack
50pphm, 40C×48h, stretched 20% (static), can be observed with a 2x magnifying glass, no cracks
Material category
50±5 or 60±5
120℃×70h
150C×70h
-5~+10
Bend to the use state after the test, no cracks, no stickiness100℃×70h
10~+10
-12~+15
100℃×70h
120℃×70h
-10～+10
12～+15
Should not be sticky or peeling after the test
120CX.70h
150CX70h
-10～+10
12～+15
150℃×70h
No cracks after the test, can be tightly combined with the cylinder body and piston40℃×22h
No cracks after bending, shall not fall off from the cylinder body and piston40℃×22h
No cracks, basically recovered within 1min
1 00c×70h
120℃×70b
150℃×70h
50pphm, 40℃×70h, stretched 15% (static), can be observed with a 2x magnifying glass, no cracks
After hot air aging, flooded with water to a depth of 300±30mm, 500 movements, no water allowed inside
The appearance quality of the shield shall comply with the relevant requirements of GB7529. 310
4.3 Dimensional tolerance
HG/T2578--94
The size of the shield shall comply with the requirements of the drawing, and its tolerance shall comply with the relevant accuracy grades of GB/T3672. Usually, the coupling surface is at M3 level, and the rest is at M4 level.
5 Test methods
5.1 Sample preparation and environmental conditioning
5.1.1 Sample preparation shall be carried out in accordance with GB9865. 5.1.2 Sample environmental conditioning shall be carried out in accordance with GB2941. 5.2 Performance tests
5.2.1 Determination of hardness shall be carried out in accordance with GB/T531 or GB6032, with GB6032 being the arbitration method. 5.2.2 Determination of compression deformation shall be carried out in accordance with GB7759. 5.2.3 Determination of tear strength shall be carried out in accordance with GB/T529. 5.2.4 Hot air aging test shall be carried out in accordance with GB3512. 5 Brake fluid resistance test shall be carried out in accordance with GB/T1690. 5.2.5
Low-temperature brittleness test shall be carried out in accordance with GB1682. 5.2.6
5.2.7 Ozone resistance test shall be carried out in accordance with GB7762. 5.2.87
High temperature action test, refer to Appendix A3 of GB7524. 5.2.9Low temperature action test, refer to Appendix A7 of GB7524. Low temperature bending test, refer to Appendix A8 of GB7524. 5.2.10
5.2.11Expansion deformation test:
5.2.11.1Take three qualified shields as samples. Use an expansion mandrel with a shape similar to the end of the brake cylinder where the shield is installed. Its diameter is 1.15 times the diameter of the shield installation groove. The surface should be smooth and chamfered, Ra=3.2. Chamfer 1×45°5.2.11.2First measure the inner diameter of the shield installation end, take the average value of the two vertical directions, then put it on the expansion mandrel. After testing according to the specified test conditions, remove the shield, leave it at room temperature for 30 minutes, and measure the inner diameter in the same way. 5.2.11.3 The expansion deformation is calculated according to formula (1): Ad
Where: △d-expansion deformation, %;
d,—inner diameter of the shield before the test, mm;
d2—inner diameter of the shield after the test, mm;
d—diameter of the expansion mandrel, mm.
The average value of the calculated results of the three test samples is taken as the test result. X100
5.2.11.4 The test of the clutch hydraulic cylinder shield shall be carried out in accordance with 5.2.11. (1)
5.2.12 Water resistance test, refer to the test method in Appendix A3 of GB7524, after the master cylinder and wheel cylinder shield are installed, heat aged, immersed in a water tank for 500 actions, and then taken out for inspection. 6 Inspection rules
6.1 Factory (delivery) inspection
6.1.1 Under normal production conditions, the rubber material is produced continuously in batches of no more than ten rolls. Take a sample from each batch and conduct physical property tests 1 to 4 in Table 2. The shield is made of the same rubber material and the same specifications in batches of no more than 5,000 pieces. Take three pieces from each batch and conduct physical property tests 1 to 2 in Table 3.
6.1.2 The appearance of the shield should be inspected piece by piece. 6.1.3 When a new model is put into production, all dimensions of the first product should be inspected and put into use only if it is qualified. In normal production, the batch is determined by the production volume 311
HG/T2578-94
. According to GB2828, the special inspection level S-2 is adopted, and the qualified quality level AQI. value is 4. Sampling inspection is carried out to determine whether it is qualified at one time.
6.2 Type inspection
When a new formula is put into production, the origin of the main raw materials is changed, the main production equipment is changed, production is resumed after a long-term shutdown, problems occur during quality inspection, or when required by the national quality supervision department, type inspection shall be carried out in accordance with all the requirements specified in this standard. 6.3 Periodic inspection
Hot air aging and brake fluid resistance shall be carried out at least once every quarter; tear strength, low temperature brittleness, and ozone resistance (when necessary) shall be carried out at least once every six months.
6.4 Finished product performance inspection
Other performance inspections of finished products shall be carried out in accordance with the agreement between the supply and demand parties. 6.5 Material re-inspection
When one of the properties of the rubber material is unqualified, double samples shall be taken for re-inspection of the unqualified items. 6.5.1 For the shield, if the re-inspection fails, the batch is unqualified. 6.5.2 For the rubber compound that fails the re-inspection, it is allowed to be repaired once and all performance items shall be inspected. If there is still one unqualified item, the rubber material of the roller is unqualified, and the batch of rubber materials should be inspected roller by roller. 6.5.3 If one of the items 5 to 12 in Table 2 and 3 to 10 in Table 3 is unqualified during the periodic inspection, it is allowed to be re-inspected once. If it is still unqualified, the product of that period is unqualified.
7 Marking, packaging, transportation, storage
7.1 The marking, packaging, transportation and storage of rubber materials shall be carried out in accordance with the relevant provisions of GB/T5721; special circumstances shall be agreed upon by the supply and demand parties. 7.2 Under the condition of complying with Article 7.1, the storage period of rubber materials is six months; the storage period of protective covers: Class 1 is two years, Class I is three years. Class II is three years, and the quality during the storage period shall comply with the provisions of this standard. 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 Northwest Rubber Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by Guizhou Rubber Parts Factory. The main drafters of this standard are Huang Zhengu, Su Guirong, Liu Yunchang and Qiu Peijin. This standard adopts JISD2608-89 "Rubber sheath for automobile hydraulic brake cylinder" and JISD2611-89 "Rubber sheath for automobile hydraulic disc brake cylinder".4 Clutch hydraulic cylinder guard test, according to 5.2.11. (1)
5.2.12 Water resistance test, refer to the test method in Appendix A3 of GB7524, after the master cylinder and wheel cylinder guards are installed, they are heat aged, immersed in a water tank for 500 movements, and then taken out for inspection. 6 Inspection rules
6.1 Factory (delivery) inspection
6.1.1 Under normal production conditions, the rubber material is continuously produced in batches of no more than ten rolls. From each batch, one sample is taken and the physical property tests of 1 to 4 in Table 2 are carried out. The guards are made of the same rubber material and the same specifications in batches of no more than 5000 pieces. From each batch, three pieces are taken and the physical property tests of 1 to 2 in Table 3 are carried out.
6.1.2 The appearance of the guards shall be inspected piece by piece. 6.1.3 When a new model is put into production, all dimensions of the first product shall be inspected and only those that pass the inspection shall be put into use. During normal production, the batch is determined by the production volume 311
HG/T2578-94
size. According to GB2828, the special inspection level S-2 is adopted, and the qualified quality level AQI. value is 4. Sampling inspection is carried out to determine whether it is qualified at one time.
6.2 Type inspection
When a new formula is put into production, the origin of the main raw materials is changed, the main production equipment is changed, production is resumed after a long-term shutdown, problems occur during quality inspection, or the national quality supervision department requires it, all requirements specified in this standard shall be subject to type inspection. 6.3 Periodic inspection
Hot air aging and brake fluid resistance shall be carried out at least once a quarter; tear strength, low temperature brittleness, and ozone resistance (when necessary) shall be carried out at least once every six months.
6.4 Finished product performance inspection
Other performance inspections of finished products shall be carried out in accordance with the agreement between the supply and demand parties. 6.5 Material re-inspection
When one item of the performance of the rubber material fails to meet the standard, double samples should be taken for re-inspection of the unqualified item. 6.5.1 For the shield, if the re-inspection fails, the batch is unqualified. 6.5.2 For the rubber material that fails to meet the re-inspection standard, it is allowed to be repaired once and all performance items are inspected. If there is still one unqualified item, the rubber material of the roller is unqualified, and the batch of rubber materials should be inspected roller by roller. 6.5.3 For items 5 to 12 in Table 2 and items 3 to 10 in Table 3, if one item fails in the periodic inspection, it is allowed to be re-inspected once. If it still fails, the products of that period are unqualified.
7 Marking, packaging, transportation, storage
7.1 The marking, packaging, transportation and storage of rubber materials shall be carried out in accordance with the relevant provisions of GB/T5721; special circumstances shall be agreed upon by the supply and demand parties. 7.2 Under the condition of complying with Article 7.1, the storage period of the rubber material is six months; the storage period of the shield is: two years for Class 1 and three years for Class I. Class II is three years, and the quality during the storage period shall comply with the provisions of this standard. 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 Northwest Rubber Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by Guizhou Rubber Parts Factory. The main drafters of this standard are Huang Zhengu, Su Guirong, Liu Yunchang, and Qiu Peijin. This standard refers to JISD2608-89 "Rubber Sheath for Automobile Hydraulic Brake Cylinder" and JISD2611-89 "Rubber Sheath for Automobile Hydraulic Disc Brake Cylinder".4 Clutch hydraulic cylinder guard test, according to 5.2.11. (1)
5.2.12 Water resistance test, refer to the test method in Appendix A3 of GB7524, after the master cylinder and wheel cylinder guards are installed, they are heat aged, immersed in a water tank for 500 movements, and then taken out for inspection. 6 Inspection rules
6.1 Factory (delivery) inspection
6.1.1 Under normal production conditions, the rubber material is continuously produced in batches of no more than ten rolls. From each batch, one sample is taken and the physical property tests of 1 to 4 in Table 2 are carried out. The guards are made of the same rubber material and the same specifications in batches of no more than 5000 pieces. From each batch, three pieces are taken and the physical property tests of 1 to 2 in Table 3 are carried out.
6.1.2 The appearance of the guards shall be inspected piece by piece. 6.1.3 When a new model is put into production, all dimensions of the first product shall be inspected and only those that pass the inspection shall be put into use. During normal production, the batch is determined by the production volume 311
HG/T2578-94
size. According to GB2828, the special inspection level S-2 is adopted, and the qualified quality level AQI. value is 4. Sampling inspection is carried out to determine whether it is qualified at one time.
6.2 Type inspection
When a new formula is put into production, the origin of the main raw materials is changed, the main production equipment is changed, production is resumed after a long-term shutdown, problems occur during quality inspection, or the national quality supervision department requires it, all requirements specified in this standard shall be subject to type inspection. 6.3 Periodic inspection
Hot air aging and brake fluid resistance shall be carried out at least once a quarter; tear strength, low temperature brittleness, and ozone resistance (when necessary) shall be carried out at least once every six months.
6.4 Finished product performance inspection
Other performance inspections of finished products shall be carried out in accordance with the agreement between the supply and demand parties. 6.5 Material re-inspection
When one item of the performance of the rubber material fails to meet the standard, double samples should be taken for re-inspection of the unqualified item. 6.5.1 For the shield, if the re-inspection fails, the batch is unqualified. 6.5.2 For the rubber material that fails to meet the re-inspection standard, it is allowed to be repaired once and all performance items are inspected. If there is still one unqualified item, the rubber material of the roller is unqualified, and the batch of rubber materials should be inspected roller by roller. 6.5.3 For items 5 to 12 in Table 2 and items 3 to 10 in Table 3, if one item fails in the periodic inspection, it is allowed to be re-inspected once. If it still fails, the products of that period are unqualified.
7 Marking, packaging, transportation, storage
7.1 The marking, packaging, transportation and storage of rubber materials shall be carried out in accordance with the relevant provisions of GB/T5721; special circumstances shall be agreed upon by the supply and demand parties. 7.2 Under the condition of complying with Article 7.1, the storage period of the rubber material is six months; the storage period of the shield is: two years for Class 1 and three years for Class I. Class II is three years, and the quality during the storage period shall comply with the provisions of this standard. 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 Northwest Rubber Products Research Institute of the Ministry of Chemical Industry. This standard is drafted by Guizhou Rubber Parts Factory. The main drafters of this standard are Huang Zhengu, Su Guirong, Liu Yunchang, and Qiu Peijin. This standard refers to JISD2608-89 "Rubber Sheath for Automobile Hydraulic Brake Cylinder" and JISD2611-89 "Rubber Sheath for Automobile Hydraulic Disc Brake Cylinder".
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