Does the secondary vulcanization of NBR O-ring have shrinkage The outer diameter of NBR rectangular ring with an outer diameter of more than 400 is 0.3mm larger. Can the outer diameter of secondary vulcanization shrink

Does the secondary vulcanization of NBR O-ring have shrinkage The outer diameter of NBR rectangular ring with an outer diameter of more than 400 is 0.3mm larger. Can the outer diameter of secondary vulcanization shrink

The secondary vulcanization is usually baked in the oven at high temperature. If the primary vulcanization reaches the positive vulcanization point, the size of the secondary vulcanization O-ring will hardly change!