Basic characteristics of rubber soft joints.

When molding rubber flexible joints, after large pressure pressing, the cohesive force inherent in the elastomer cannot be eliminated, which often produces unstable shrinkage when molding out of the mold (the shrinkage rate of rubber varies depending on the type of rubber), which can be eased and stabilized after a period of time. Therefore, when a rubber product is designed at the beginning, regardless of the formula or mold, it is necessary to calculate carefully with, if not, it is easy to produce products with unstable dimensions, resulting in low quality products.
Rubber is a hot-soluble thermosetting elastomer, while plastic is a hot-soluble cold-setting one. The temperature range for molding and curing of rubber is different from the main body of vulcanization, and it can even be affected by climate change, indoor temperature and humidity. Therefore, the production conditions of rubber joints need to be moderately adjusted at any time, and if not, the difference in product quality may occur.