Vulcanization
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Vulcanization is a range of processes for hardening rubbers. The term originally referred exclusively to the treatment of natural rubber with sulfur and heat, which remains the most common practice. I
Worker placing a tire in a mold before vulcanization, 1941
Roller hockey ball created via vulcanization
Two factory workers placing rubber tubing into a vulcaniser (1918)
An example of a silicone rubber keypad typical of liquid silicone rubber (LSR) moulding