This standard specifies the 180° peel test method for vulcanized rubber and metal. This standard is applicable to the determination of the 180° peel strength of vulcanized rubber and metal, and is also applicable to the determination of the 180° peel strength of other flexible materials and rigid materials. This standard is not applicable to materials with low flexibility that will crack or delaminate when bent 180°. Such materials can be subjected to a 90° peel test. The test method can refer to GB/T7760. GB/T 15254-1994 180° peel test for vulcanized rubber and metal GB/T15254-1994 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Rubber ,vulcanized --Determination of adhesion to metal-180° Peel test method This standard is equivalent to the international standard ISO8510-2:1990 "Adhesive 1 Subject content and scope of application
This standard specifies the 180° peel test method for adhesion between vulcanized rubber and metal. GB/T 15254—94
180° peel test for adhesion of flexible materials to rigid materials This standard is applicable to the determination of the 180° peel strength of adhesion between vulcanized rubber and metal, and is also applicable to the determination of the 180° peel strength of adhesion between other flexible materials and rigid materials.
This standard is not applicable to materials with low flexibility such as those that will crack or delaminate when bent 180°. Such materials can be subjected to a 90° peel test. The test method can refer to GB/T7760. Www.bzxZ.net
2 Reference standards
GB2941 Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens GB/T7760 Determination of adhesion between vulcanized rubber and metal Single plate method 3 Principle
The specimen is made of vulcanized rubber and metal. At the open end of the bonded specimen, the material is gradually peeled off in parallel along the length direction of the bonded material at a steady speed. The applied force passes through the peeled part of the rubber bonded material and is parallel to the metal plate. The average peeling force that the specimen can withstand per unit width is the 180° peeling strength. 4 Device
4.1 Testing machine
The force measurement range of the testing machine should be appropriate, and the destructive force of the specimen should be within the range of 10% to 80% of the full scale. The testing machine should be able to ensure that the specimen holder applies force to the specimen at a speed of 100 ± 10 mm/min. The force value error of the testing machine should not exceed 2%. The testing machine should have a device for automatically recording the peeling force. It is best to use an inertia-free tensile testing machine. 4.2 Specimen holders
There shall be two specimen holders. One holder shall be suitable for holding metal plates and the other for holding vulcanized rubber. The holder for holding vulcanized rubber shall be automatically adjusted so that the applied force is parallel to the metal plates. 4.3 Gauges
The accuracy of the gauge for measuring the bonding width of the specimen shall not be less than 0.1 mm. 5 Specimens
5.1 The specimens shall be made by bonding vulcanized rubber to metal plates. Unless otherwise specified, the shape and dimensions of the specimens shall be as shown in the figure. Approved by the State Administration of Technical Supervision on September 24, 1994 511
Implementation on August 1, 1995
Metal Number
GB/T15254-94
Vulcanized Rubber
Specimen Shape and Dimensions
5.2 The thickness of the vulcanized rubber is 2mm, the width is 25.0±0.5mm, and the length is at least 350mm. If the supply and demand parties agree, the vulcanized rubber can also use other thicknesses, but it is best not to exceed 3mm. The thickness of the vulcanized rubber has an impact on the test results. The test results of samples with different thicknesses cannot be compared with each other.
Note: For materials with loose edges such as cotton canvas, each side is 5mm wider than the metal plate. 5.3 The metal plate should be flat, 1.5mm thick, 25.0±0.5mm wide, and at least 200mm long. 6. Preparation of test specimens
6.1 Types and brands of vulcanized rubber, metal, and adhesive; surface treatment of the bonding surface; adhesive ratio, number of times of coating, and air-drying time; curing conditions such as temperature, pressure, and time shall be carried out in accordance with the technical requirements and bonding process regulations specified by the adhesive manufacturer. 6.2 Rubber and metal plates can be bonded by vulcanization, or vulcanized rubber and metal plates can be bonded by adhesive. 6.3 Test specimens can be prepared individually, or they can be bonded into large plates first and then cut into individual specimens. Be careful when cutting the test specimens to prevent them from being damaged by heat or machinery. When cutting, discard 12mm on each side parallel to the length of the test specimen. 6.4 If adhesive is used for bonding, apply glue on the entire bonding surface of the rubber and metal plate, and do not miss any glue. The length of the glue application is 150mm. 6.5 When preparing the test specimen, place an anti-adhesive tape about 30mm wide between the rubber and metal plate at the peeling end of the test specimen to facilitate peeling the test specimen before testing.
6.6 The sample should be flat, and the misalignment of the bonding surface should not be greater than 0.2mm. 6.7 If the sample needs to be pressurized, uniform pressure should be applied to the entire bonding surface. If there are no other regulations, the pressure is 700kPa. When pressurizing, a rubber pad with a thickness of about 10mm and a hardness of about 45 Shore A is covered on the surface of the sample to facilitate uniform pressure distribution on the bonding surface. 6.8 If necessary, the average thickness of the adhesive layer in the sample can be measured by weighing or other appropriate methods. 7 Number of samples
The number of samples should not be less than 5.
8 Sample adjustment and test environment
Sample adjustment, test temperature and time interval should comply with the provisions of GB2941. 9 Test steps
9.1 Measure the width of the bonding surface of the sample, and measure the location at least 3 times. Take the average value, accurate to 0.1mm. 9.2 Bend the vulcanized rubber at the peeling end 180° and clamp it in an automatically adjustable clamp. Clamp the metal plate in another clamp with the peeling surface facing the operator. Clamp the sample carefully and position it accurately so that the peeling force is evenly distributed over the bonding width when the sample is subjected to force. 9.3 Start the testing machine and allow the clamp to peel the sample at a speed of 100±10mm/min. Other speeds may also be used if otherwise specified.
9.4 Use an automatic recording device to continuously record the peeling force when the sample is peeled, with a peeling length of at least 125mm. 9.5 If partial peeling occurs during the test, the test can be continued after the vulcanized rubber and the metal plate are separated with a knife at the bonding surface. If the vulcanized rubber breaks, it means that the peeling strength is greater than the tearing strength of the vulcanized rubber, and the test is stopped. 9.6 Record the type of sample peeling failure:
The type of sample peeling failure is represented by the following symbols. R: failure of vulcanized rubber;
RC: failure between vulcanized rubber and adhesive;
CP: cohesive failure of adhesive;
M: failure between adhesive and metal.
10 Test results
GB/T15254—94
10.1 After discarding the initial 25mm peeling length on the peeling curve, take the average value of the forces on the remaining peeling curve as the average peeling force of the sample. The average peeling force divided by the width of the bonding surface is the peeling strength of the sample, expressed in kN/m. 10.2 Record the maximum peeling force and the minimum peeling force within the calculated length of the peeling curve, and calculate the maximum peeling strength and the minimum peeling strength of the sample.
10.3 Calculate the arithmetic mean of the peeling strength of all samples and the arithmetic mean of the maximum peeling strength and the minimum peeling strength. 10.4 The average peeling force can be obtained by drawing contour lines or measuring the area or other appropriate methods. 10.5 The peel strength of the bond between vulcanized rubber and metal shall be calculated according to formula (1) or formula (2): =c
Peel strength of the bond between vulcanized rubber and metal, kN/m; where: —
Force represented by the unit length of the load coordinate axis of the peel curve, N/cm, average height of the peel curve within the peel length, cm; H
B—Average width of the bonding surface of the specimen, mm; S—Area enclosed by the peel curve within the peel length, cm\; L
Peel length, cm.
Note: If necessary, the initial peak value of each specimen may be recorded. 11 Test report
The test report shall include the following:
.....( 2)
Average peel strength, maximum peel strength and minimum peel strength of each specimen. The arithmetic mean of the average peel strength, maximum peel strength and minimum peel strength of all samples; the type of failure of each sample;
the type and brand of vulcanized rubber, metal and adhesive; the preparation process and method of the sample;
test conditions;
test date;
tester;
other conditions different from this standard, such as backing material, rubber thickness, etc. Additional remarks:
GB/T15254—94
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. This standard is drafted by the Shanghai Rubber Products Research Institute. The main drafter of this standard is Ju Yinhan.
This standard is entrusted to the Beijing Rubber Industry Research and Design Institute for interpretation. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG4--854--81 "Determination of Peel Strength of Vulcanized Rubber and Metal Bonding" shall be abolished.
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