Car door seal surface is how bubbles

Car door seals and other rubber seal products surface bubbles appear, because the following aspects:cable tie markers

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;

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