Heat buildup in a rubber material occurs as it is exposed to any of a variety of compressive stresses in service. Data from this type of testing is commonly used to estimate the service quality of different compounds for evaluation of material options in end product applications.
Heat buildup testing (also referred to as blow out) is generally conducted by exposing a rubber sample of a specified size and shape to oscillating compressive stresses in a controlled environment. During this process, heat will be generated by the stress. The increase in temperature through the procedure is measured as either an increase to a specific equilibrium temperature or as a total rise in temperature over a given period of time.
Testing can also be used to evaluate other performance characteristics such as the degree of permanent set, test sample dimensional changes and the time required to reach a failure by rupture or blow out.
- ASTM D623— Standard Test Methods for Rubber Property—Heat Generation and Flexing Fatigue In Compression