Usability
Electrical insulating parts, tires (tire shoulders: cooling).
Vulcanization
When the tire reacts with sulfur in the right quantity. At temperatures above the melting point of sulfur. The tires will have a constant temperature. Resistant to heat, light and dissolved in a solvent difficult. Such a process is known as vulcanization process, Sun reacted as follows.
Yang added that the right amount of sulfur. Is covalent bond of connection between sulfur chain poly isoprene in some locations. When the force The chain will not slip off easily. It will shape a more flexible rubber Fig.
In addition to silica, silicate and activated charcoal to help strengthen the rubber to produce tires of vehicles, especially charcoal prevents erosion and destruction by the sun as well.