Possible Problems During The Vulcanization Process Of Silicone Rubber | JCT Machinery

Cracks and peeling on the surface of the 

product (occurring at the mold joints)

It is caused by the combined effects of strong thermal expansion, shrinkage and compression of the rubber during 

vulcanization.

Reduce the vulcanization temperature; accurately weigh the rubber material and reduce the vulcanization pressure; only release the mold when it is cooled to 40~50℃ after 

vulcanization.

There are air bubbles in the

 rubber material

Appropriately control the degree of re-refining to avoid excessive re-refining; accurately weigh the rubber material and make it into a certain shape to fill the mold cavity to effectively eliminate air; then pressurizing, the mold must be completely pressed and 

decompressed several times to eliminate air; ventilation holes are provided on the 

mold.

There are traces of flow on the surface of the 

product

The rubber material is fully re-refines and quickly loaded and pressurized to avoid

 early vulcanization.

There are white blooming spots on the surface 

of the product (vulcanized by vulcanizing agent BP)