Car door seal surface causes air bubbles

Car door seals and other rubber seal products surface bubbles appear, because the following aspects:rail car seals

1, there is water (add a little mixing calcium oxide);

2, is not fully cured, unfamiliar look with bubbles;

3, a vulcanizing agent impurities, impurities in advance into a small molecular decomposition products in the residual air bubbles;

4, the mold itself exhaust design is unreasonable, plastic punch line gas can not be discharged;

5, poor dispersion;padlock seal

6, long rubber mastication, the vulcanization product has bubbles.