This standard specifies four methods for measuring the dimensions of test specimens and products for vulcanized rubber or thermoplastic rubber testing. A, B and C are contact measurement methods. D is a non-contact measurement method. GB/T 5723-1993 Determination of the dimensions of test specimens and products for vulcanized rubber or thermoplastic rubber testing GB/T5723-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber, vulcanized or thermoplastic
Determination of dimensions of test pieces and products for test purposes
Rubber, vulcanized or thermoplasticDetermination of dimensions of test pieces and products for test purposesGB/T 5723-—93
Replaces GB5723-85
This standard is equivalent to the international standard ISO4648-1991 "Rubber, vulcanized or thermoplastic-Determination of dimensions of test pieces and products for test purposes".
1 Subject content and scope of application
This standard specifies four methods for measuring the dimensions of test pieces and products for vulcanized rubber or thermoplastic rubber tests. A, B and C are contact measurement methods, and D is a non-contact measurement method.
Method A of this standard is applicable to measuring dimensions below 30mm, method B is applicable to measuring dimensions between 30 and 100mm, method C is applicable to measuring dimensions above 100mm, and method D is applicable to measuring all dimensions. When the specimen or product has a curved surface or a complex shape, other measurement methods can be used. Commonly used measuring instruments are shown in Appendix A\. 2 Environmental conditioning and test temperature and humidity
The environmental conditioning of the specimen and the test temperature and humidity shall comply with the provisions of the relevant test methods. 3 Measurement methods
3.1 Method A
This method is suitable for measuring the dimensions of specimens or products below 30 mm placed between two parallel planes, and is also suitable for measuring other dimensions of specimens and products that are subjected to a specified pressure without causing any obvious deformation. Use the thickness gauge described in Appendix B\ to measure the dimensions. The thickness gauge consists of a flat and hard base platform on which the specimen or product is placed and a dial indicator. The dial indicator has an error of no more than 1% or 0.01 mm and is equipped with a set of flat circular measuring feet with a diameter of 2 to 10 mm to apply a specified pressure on the specimen or product. The circular measuring feet should not extend beyond the edge of the specimen or product. Apply a pressure of 22±5kPa to the sample or product with a hardness equal to or greater than 35IRHD; apply a pressure of 10±2kPa to the sample or product with a hardness less than 35IRHD. The mass required for the test foot to produce a specified pressure of 22±5kPa or 10±2kPa on the sample or product is listed in Table 1. Instructions for use:
1) IS04648 does not have this appendix
2) ISO4648 does not have this appendix, but the original GB5723-85 has it and is still retained. Approved by the State Administration of Technical Supervision on December 30, 1993 and implemented on October 1, 1994
Measurement foot diameter
GB/T 5723-93
Mass required to apply the specified pressure
10+2kPa
At least three measurements shall be taken for each measured dimension, and the median shall be reported. 22±5kPa
3.2 Method B
This method is suitable for measuring the dimensions of specimens or products with a size of 30~~100mm. Use a vernier caliper with an error of no more than 1% to measure the dimensions. During measurement, the caliper should not cause deformation of the measured part. Adjust the caliper so that the measuring surface contacts the surface of the specimen or product without compressing it. Read each measurement value in the direction perpendicular to the relative surface of the specimen or product. Take at least three measurements for each measured dimension and report the median. 3.3 Method C
This method is suitable for measuring the dimensions of specimens or products over 100mm. Use a ruler or tape measure with an error of no more than 1mm to measure the dimensions. During measurement, read each measurement value in the direction perpendicular to the relative surface of the specimen or product. Take at least three measurements for each measured dimension and report the median. 3.4 Method D
This method is suitable for measuring all dimensions, especially when the sample or product has a special shape (such as O-ring, sample taken from hose, conveyor belt), this non-contact method can be used for measurement. Use various types of optical instruments, such as: mobile microscope, projection microscope or X-ray camera to measure the dimensions. The error of these instruments should not exceed 1% or 0.01mm. The one with the smallest error should be used. At least three measurements should be taken for each measured dimension, and the median should be reported. 4 Test report
The test report should include the following:
The name or code of the test sample,
The name or code of the standard based on which the test is conducted;
Environmental conditioning and test temperature and humidity,
The method used for measurement (A, B, C, D method) and measuring instruments; measurement results (i.e. median);
Report date;
Tester and reviewer.
Method classification
Universal tool microscope
Large tool microscope
Non-contact method
Reading microscope
Projector
GB/T 5723—93
Appendix A
Common measuring instruments
(reference part)
Instrument name
Measuring instrument for large diameter sealing products
Thickness gauge
Precision rulerWww.bzxZ.net
Outside micrometer
Inside micrometer
Contact method
Vernier caliper
Steel ruler
Tapered rod
Steel tape measure
Outside diameter rapid measuring instrument for rotating shaft shaped seal with skeleton Appendix B
Thickness gauge suitable for method A
(reference part)
Graduation value
0. 01,0. 02
0. 02,0. 05,0. 10
Measuring range
0~250
0~200
0~70
180~500
100~~5 000
0~3000
50~5000
0~2000
0~2000
10~100
The thickness gauge is a relatively sophisticated device that meets the requirements of Method A (see Figure B1). It is particularly suitable for measuring the dimensions of rubber materials with a hardness of less than 35IRHD.
Composition of the thickness gauge
B1.1 Hard and flat base platform.
B1.2 Dial indicator with a graduation value of 0.01mm. A hard small rod. The lower end of the small rod can be installed with a flat-headed circular measuring foot of different diameters. The upper end of the small rod has a convex B1.3
edge combined with the iron yoke; the total mass of the small rod should be 7.2g, suitable for a measuring foot with a diameter of 3mm, measuring rubber with a hardness less than 35IRHD. When other measuring feet are used for measurement, additional magnetic codes can be added to achieve the specified pressure. B1.4 Locking knob. When the knob is locked, the small rod can be fixed in any vertical position. When the knob is loosened, the small rod can move vertically up and down completely freely.
B1.5 Joystick for vertical movement of the iron yoke and the small rod. 23
Digital indicator
Locking purple knob
Gauge block (sample)
B2 How to use the thickness gauge
GB/T 5723--93
Figure B1 Schematic diagram of thickness gauge
Operation lever
First, lift the operation lever to make the iron yoke, small rod and dial indicator rod fall completely, make the measuring foot at the lower end of the small rod contact the base platform of the thickness gauge (or the gauge block on the base platform), adjust the zero point of the dial indicator, then press the operation lever to lift the iron yoke, small rod and dial indicator rod, insert the sample or product, and then slightly lift the operation lever to make the iron yoke fall partially, the small rod and its measuring foot fall freely on the sample, and the dial indicator rod is still supported; after locking the locking knob, lift the operation lever completely to make the dial indicator rod and iron yoke fall completely, then record the dial indicator reading (or add the thickness of the gauge block), which is the thickness of the sample or product. Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Beijing Rubber Industry Research and Design 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 revision are Li Zongqi, Su Guirong and Chen Jinyang. This standard is entrusted to the Beijing Rubber Industry Research and Design Institute for interpretation.
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