The fully automatic international rubber hardness tester is mainly used to measure the hardness of materials such as rubber, plastic, and elastomers. It is tested based on the Shore hardness standard and is a common material hardness testing equipment. The following is the test method for the fully automatic international rubber hardness tester:
1、 Preparation work
Equipment inspection
Check if the hardness tester is working properly, including the display screen, sensors, pressure head, etc.
Ensure that the hardness tester being tested is in a "calibrated" state and perform necessary calibration to ensure accurate test results.
Sample preparation
Selection of rubber specimens: Ensure that the thickness and shape of the specimens meet the testing requirements. Common sample shapes include cylindrical, sheet-like, or block shaped.
Surface treatment: Ensure that the surface of the rubber sample is smooth and free of defects, dust, oil stains, and other impurities that may affect hardness testing. If the surface is not smooth, it may need to be polished or cleaned.
environmental conditions
The test should be conducted at standard temperature and humidity. The ideal testing environment temperature is 23 ± 2 ° C and the relative humidity is 50 ± 10%.
Excessive or insufficient temperature may affect the hardness of rubber materials, thereby affecting the test results.
2、 Hardness testing steps
Choose an appropriate hardness tester
International rubber hardness testers generally use Shore hardness testers, including A type, D type, OO type, etc. Type A is used for soft rubber, type D is used for harder plastics, and type OO is suitable for very soft rubber materials.
Select the appropriate type of hardness tester based on the hardness range of the sample.
Place the sample in the testing position
Place the rubber sample on the testing platform of the hardness tester, ensuring that the sample fully contacts the testing platform and does not affect the test due to tilting or movement.
Test begins
Start the hardness tester, and the equipment will automatically apply standard indenter pressure. Usually, hardness testing is conducted by applying a certain load (indenter weight) and recording the depth of indentation.
Ensure that the indenter is in vertical contact with the surface of the sample. The standard depth and load of the indenter have been set in the settings of the hardness tester.
Pressure and Maintenance
The hardness tester will automatically apply a pressure head to the sample, and the pressure head will apply pressure within the specified time. Generally speaking, the testing time ranges from a few seconds to several tens of seconds.
During the testing period, the instrument will automatically monitor the depth of the indenter and calculate its hardness value.
Read the hardness value
After the testing time is over, the instrument will automatically display the hardness value. The hardness value is usually represented by "ShoreA" or "ShoreD", depending on the type of test used.
In fully automated testing, the instrument will directly display digital hardness values to ensure ease and efficiency of operation.
Record test data
Record the test results and conduct repeated tests on multiple locations of the sample to ensure the reliability and consistency of the data. According to the requirements, 3 to 5 tests can be conducted and the average value taken.
3、 Data Processing and Reporting
data analysis
Analyze data from multiple testing points and observe the distribution of hardness values. If there are significant differences between test results, it may be necessary to check the uniformity of the sample or calibrate the testing equipment.
Report Generation
Generate a test report based on the hardness test results. The report usually includes:
Sample information (such as material type, size, batch, etc.)
Testing methods and types of hardness testers
Test results (including hardness values, units, etc.)
Conclusion and recommendations (such as whether the sample meets the hardness standards, etc.)
Calibration and Verification
Regular calibration of the hardness tester is necessary to ensure the accuracy of the measurement results. Use standard samples with known hardness for calibration to verify the accuracy of the instrument.
4、 Common problems and precautions
The surface of the sample is uneven
If the surface of the sample is uneven, it may lead to inaccurate test values. Ensure that the surface of the sample is flat and free of defects.
Temperature fluctuations during the testing process
The temperature fluctuations of the sample during testing can affect the hardness value, so it is important to ensure that the sample has reached a stable temperature during testing.
instrument calibration
Regularly calibrate instruments, especially after prolonged use. Use standard hardness blocks for calibration to ensure the accuracy of instrument readings.
Head selection
Ensure to select the type of indenter that matches the hardness of the sample. For example, soft rubber is suitable for A-type indenters, while hard rubber or plastic uses D-type indenters. Improper selection may lead to inaccurate test results.
Through the above steps, using a fully automatic international rubber hardness tester for hardness testing of rubber materials can achieve efficient and accurate results.