how to check the materials of the cam and groove coupling?

　　The first method: Medium weight resistance experiment

　　You can choose a sample from the cam and groove coupling, then put the sample into some different mediums, you should make sure that all of the mediums are in same temperature, 10 minutes later, take out the sample and check its weight, then according to the change of the weight, we can confirm the materials.

　　For example, if you put the sample into the engine oil and the temperature is 100 degrees, 24 hours later, we take out the sample, if the weight has a little change, we can confirm the material is ECO or CR, because they have a good ability of hardness.

　　The second method: the ignition method

　　You can choosing a sample from the cam and groove coupling, then fire it in the air, if the flame is very small, we can confirm the material is CR，CSM, because those materials would extinguish without the fire.
 

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