A. Causes:

① Improper product formula design and insufficient aging performance.

② The molding temperature is too high and the time is too long

③ The secondary vulcanization temperature is too high and the time is too long

④ The curing time of the rubber vulcanization curve is too short, which is unqualified

B. Countermeasures:

① According to customer requirements, design safe aging performance and verification

② Do a good inspection of the process, the mold temperature and vulcanization time meet the process requirements before the operation can be carried out

③ Do a good inspection of the process, and the second baking temperature and vulcanization time meet the process requirements before the operation can be performed

④ Test the rubber compound to prevent the operation of the rubber compound that is too short to be unqualified