Properties
Some of the most useful properties of silicone include:
- Good electrical insulation. Because silicone can be formulated to be electrically insulative or conductive, it is suitable for a wide range of electrical applications.
- Thermal stability (constancy of properties over a wide operating range of −100 to 250 °C).
- Though not a hydrophobe, the ability to repel water and form watertight seals.
- Excellent resistance to oxygen, ozone and UV light (sunlight). This has led to widespread use in the construction industry (e.g. coatings, fire protection, glazing seals), and automotive industry (external gaskets, external trim).
- Non-stick.
- Low chemical reactivity.
- Low toxicity, but does not support microbiological growth.
- High gas permeability: at room temperature (25 °C) the permeability of silicone rubber for gases like oxygen is approximately 400 times that of butyl rubber, making silicone useful for medical applications (though precluding it from applications where gas-tight seals are necessary).
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