There are several testing methods used to evaluate the performance of automotive seals, including:

Compression testing: This involves compressing a seal to a specific amount and measuring the force required to achieve that compression. This test is used to evaluate the seal's resilience and resistance to compression set.

Leakage testing: This involves exposing the seal to a fluid or gas under pressure and checking for any leaks. This test is used to evaluate the seal's ability to create an effective barrier against the fluid or gas.

Temperature testing: This involves subjecting the seal to various temperature extremes and checking for any degradation or other changes in the seal material. This test is used to evaluate the seal's ability to withstand high or low temperatures without degrading or losing its sealing properties.

Environmental exposure testing: This involves subjecting the seal to various environmental conditions, such as exposure to UV light or salt water, and checking for any degradation or other changes in the seal material. This test is used to evaluate the seal's ability to withstand exposure to harsh environmental conditions.

Dynamic testing: This involves subjecting the seal to various dynamic conditions, such as repeated flexing or twisting, and checking for any damage or wear. This test is used to evaluate the seal's ability to withstand repeated motion without losing its sealing properties.

It's important to use appropriate testing methods to ensure that seals meet the required performance standards and can function effectively in automotive applications.