What to pay attention to when using a digital Shore hardness tester

Digital display Shore rubber hardness tester is an instrument to measure the hardness of vulcanized rubber and plastic products, the instrument has a type, D type, C type three forms
.

Type A and type D are suitable for testing
the hardness of low-medium hardness and high-hardness rubber and plastic materials, respectively.

Type C is suitable for the test of the hardness of the shoe microporous material made of rubber and plastic when the compression ratio is 50% and the
stress is above 0.
049MPa.

This hardness tester implements the relevant provisions
of GB/T531, GB2411, HG/T2489 and JB6148.

Instructions for use: 1, before use, you should check the display of the hardness tester in the free state should display "000" (if "000" is not displayed, you can press the "ZERO" key to zero).


When the hardness tester is pressed on a flat datum (glass or metal platform), the display should display 100±1 degrees, if it cannot be accurately displayed, the hardness tester cannot be used, and it is appropriate
to adjust it to the factory for excellence.

2, D-type hardness tester pressure in the reference plane to test the zero position, because the hard indenter is easy to press into the datum under large load, and can not accurately read, so it is necessary to put a standard measuring block on the reference surface, the operation of the handheld hardness tester, press against the center hole of the quasi-measuring block, press into the hardness tester, when the hardness tester pressure foot and the measuring block and the reference surface are compacted, the hardness meter should display 10±1HD (the thickness of the measuring block is 2.
25±0.
003mm is equal to the pressing depth when the hardness tester is pressed into 10HD), If it is not displayed accurately, the hardness tester is also unusable
.

3.
The rubber specimen should be prepared according to the requirements of GB/T531, the plastic specimens should be prepared according to the requirements of GB2411, and the specimens of rubber and plastic microporous materials should be prepared according to the requirements of HG/T2489
.

4.
In the case of possibility, rubber and plastic specimens should be adjusted at laboratory standard temperature according to the provisions of GB/T2941 and GB/T2918 before testing
.

5.
When the measurement value of the A-type hardness tester exceeds 90HA with the sample, it is recommended to use the D-type hardness tester, and when the measured value of the D-type hardness tester is lower than 20HD, it is recommended to use the A-type hardness tester, and the A-type hardness tester is inaccurate
when the indicated value is lower than 10HA.

Measurement results cannot be used
.

6, after the hardness tester is used, it should be wiped clean and loaded into the instrument box, placed in a dry place to prevent moisture, the measuring frame should be rubbed frequently, and a small amount of anti-rust oil should be applied to prevent rust, and the No.
20 oil should be added to the active part