How to test hardness of rubber?
Commonly used methods for testing the hardness of rubber products include:
1. Methanol cut-off method: Put the rubber sample under the needle of a hard tester, and then press the needle into the rubber surface to a certain depth within 10 seconds. At this time, the length of the needle is absorbed by the rubber, and then take the needle out. Calculate the hardness value of the rubber by measuring the length of the needle covered with methanol.
2. Duper hardness tester method: Put the rubber sample on top of a Duper hardness tester, and then press the pressure shrinker, which will press the steel ball into the rubber at a standard speed, so as to measure the rubber hardness .
3. Tensile hardness method: This method calculates the hardness value by stretching a piece of rubber model, recording the maximum stretching length and initial length of the rubber.
4. Puncture hardness method: The needle penetrates a predetermined distance from one side of the sample, then records the puncture force and calculates the hardness value.
5. Rockwell hardness tester method: Put the rubber sample on top of a Rockwell hardness tester, and then press the pressure reducer, which will press the head into the rubber at a certain speed, so as to measure the rubber hardness .
