HG/T 2413.1-1992 Determination of apparent hardness of rubber rollers - PJ hardness tester method HG/T2413.1-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Determination of Apparent Hardness of Rubber Rollers
PJ Hardness Tester Method
HG / T 2413, 1 —92
This standard is equivalent to the international standard ISO7267/3-1988 "Determination of Apparent Hardness of Rubber Rollers-Part 3: PJ Hardness Tester Method".
The hardness of rubber rolls directly affects the performance of the product, so its measurement is usually carried out on the finished rolls. No matter which method is selected, the hardness value measured is affected by the type of rubber, roll diameter, roll core characteristics and rubber coating thickness in addition to the measurement method. In order to distinguish it from the hardness value measured on the standard test piece, this standard adopts the term "apparent hardness". Due to the different sizes, structures, uses and purposes of hardness determination of rubber rolls, it is not enough to use only one test method. For this reason, three independent test methods are specified: Rubber International Hardness Tester The standard specifies the PJ hardness tester method.
1 Subject content and scope of application
This standard specifies the test conditions, instruments and test steps required for measuring the apparent hardness of rubber rollers using the PJ hardness tester method. This standard is applicable to measuring the hardness on vulcanized rubber auxiliary, expressed as the PJ indentation value. The greater the hardness of the rubber, the smaller the PJ indentation value. 2 Reference standards
GB/T2941 Standard temperature, humidity and humidity for environmental conditioning and testing of rubber specimens Time GB9894 Rubber Roller Hardness Requirements
3 Terms
Zhao's Indentation Value: The depth of indentation of a steel ball with a diameter of 3.175m under a force of 9.8N, expressed in hundredths of a millimeter,
4 Time interval between vulcanization, fine grinding and testing. Testing shall not be carried out if the time is less than 16h after vulcanization or fine grinding. As an arbitration test, the storage time after vulcanization shall not be less than 72b,: 5 Test temperature and adjustment
The test shall be carried out at a standard laboratory temperature of 23±2C (according to GB/T294 1) In order to make the sample reach equilibrium with the test environment temperature, the sample should be stored for a sufficient time under the test conditions. When the sample is large, the storage time and conditions should be specified in the product technical requirements. In order to be comparable, the entire process of any test or a group of tests should be carried out at the same temperature as before. 6 Test Instruments
6.1 Degree meter
It consists of a support frame, pressure head, code, depth indicator and sample holder. Approved by the Ministry of Chemical Industry of the People's Republic of China on October 22, 1992 and implemented on July 1, 1993
HG / T 2413.1 92
6.1.1 The structure of the support frame should have the following functions: the pressure head and the magnetic code can be raised and lowered vertically independently; the pressure head can be parked on the surface of the sample; and the base code can be added to the pressure head
6.1.2 The magnetic head is composed of a vertical steel rod with a depth indicator needle connected to the upper end and a steel ball at the lower end. The diameter of the steel ball is 3.175±0.015mm, and it is made of stainless hard metal with appropriate wear resistance treatment after highly polishing. 6.1.3 The mass of the base code is 1000±0.01 more, which is used to apply a fixed force on the pressure head. 6.1.4 The depth indicator is composed of a dial with a graduation of 0.01mm and other appropriate devices, and the range should be able to indicate the movement range of the pressure head of 3mm
6.1.5 As shown in the figure, the sample holder consists of two metal plates, threaded rods and nuts, which are used to clamp the sample to make it flat and prevent test errors caused by slight movement. A hole and a gap should be opened on the top plate of the sample holder to facilitate the action of the indenter. The drilled hole
Threaded hole
Threaded sample
Assembly drawing
Figure Sample holder
7 Test steps 1)
HG/T2413.1—92
7.1 Place the rubber sheet to be tested horizontally so that the surface to be tested is at the top and keep it stable. Place the hardness tester (6.3) firmly on the part to be tested of the rubber sheet. Use the bubble level on the base of the support frame to adjust the level so that the axis of the indenter is perpendicular to the surface to be tested of the rubber sheet. After the indenter is lowered to contact the surface of the rubber roller, continue to lower it until the needle of the depth indicator (6.1.4) rotates three circles to zero. Slowly turn the loading joystick from left to right to add all the base weights to the indenter. After 60s, the indentation value is read. Note: To measure the average hardness of the rubber roller and the hardness at the same root, it is possible to specify that measurements be carried out at certain points along the length and circumference of the rubber roller (see GB 9894).
8 Result expression
The apparent hardness is expressed as the median of three measurements on each measuring surface, and the report is accurate to the integer. Test report
The test report should include the following contents:
Based on this standard;
Full description of the rubber roller being tested:
Test temperature;
Apparent hardness:
Test date,
Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China This standard is issued by Beijing Rubber Products Design Institute and drafted by Beijing Rubber Products Design Institute. The main drafters of this standard are Zhang Chengyan and Liu Ting. Instructions for adoption: bZxz.net
1 This standard is based on the structure of the current domestic PJ-I rubber hardness tester. The original ISO7267/3 test method specifies that the distance between the support plate and the shoulder of the base code sleeve is about 5mm to mark whether the magnetic code is fully added to the pressure head. It is changed to directly rotating the loading joystick to put all the codes on the pressure head, which is easier to operate.
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