Low temperature performance

Low temperature performance Generally, the following three methods are used to express the low temperature resistance of rubber.
 1) The most commonly used is the brittle temperature, which refers to the highest temperature at which the sample ruptures when subjected to a certain impact force at low temperature, which can be used to compare the low temperature performance of different rubber compounds. However, because the working state of rubber is different from the test conditions, the brittleness temperature of rubber does not indicate the minimum working temperature of rubber parts, especially in oil medium.
2) The low temperature retraction temperature is to stretch the test piece to a certain length at room temperature, then fix it, quickly cool it to below the freezing temperature, release the test piece after reaching the temperature balance, and heat up at a certain speed, and record the test piece retraction 10 %, 30%, 50% and 70% of the temperature, respectively TR10,

TR30, TR50 and TR70 are indicated. In material standards, TR10 is generally used as the standard, which is close to the brittleness temperature of rubber.

3) Cold resistance coefficient, generally compress the sample to a certain amount of deformation at room temperature, then freeze it at a specified low temperature, and then unload the load to restore it at a low temperature. The ratio of the recovery amount to the compression amount is called the compression cold resistance coefficient. . The larger the coefficient, the better the cold resistance of the rubber.