products than surface causes of bubble: 1.
There are water (
Mixed with calcium oxide)
Not fully vulcanizing, are not ripe appears to have bubbles;
Vulcanizing agent impurity is more, small molecule impurities in advance into decomposition, bubble residual products;
Die itself exhaust design is unreasonable, rubber finish oil-gas not discharge in time;
Long rubber plastication, product sulfide has air bubbles.
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