What happens when the rubber material is heated? Is it hardened or cracked?
Will become soft, do not apply external force, it will not crack, but long-term over vulcanization, high temperature heating on rubber material will be aging, or even carbonization, cooling will harden, use it will be easy to break
The heat will soften. No poisonous substance will be released
Rubber is an elastomer that does not harden and crackBut long time more than the rubber material of the specified temperature will appear aging hardening crack
