SILICONE

Perfect for both low- and high-temperature applications, silicone rubber boasts of great electrical properties and resistance to ozone attack and weathering. It is not, however, resistant to super-heated steam, and its physical properties are low, although they are retained at higher temps.
It is not very resistant to petroleum-based fluids, and its gas permeability is very poor.
It is also a very expensive type of rubber to use compared to other types. There are food-quality grades of silicone rubber that are FDA compliant and used in both the food and pharmaceutical industries.
Silicone rubber is used in food and baking products, electronics, various medical devices, sealants, hardware products, and some home repair products.