Viton rubber, a brand of fluoroelastomer, is known for its exceptional resistance to high temperatures, chemicals, and oils, making it superior in certain applications compared to other elastomers. It can withstand temperatures ranging from -20°C to 205°C, and even up to 230°C for short periods, which is higher than many other elastomers like nitrile or EPDM. 
In terms of chemical resistance, Viton excels against a wide range of substances, including oils, fuels, lubricants, and most mineral acids, outperforming elastomers like nitrile rubber, which is more susceptible to swelling and degradation in such environments. This makes Viton ideal for automotive, aerospace, and industrial applications where exposure to harsh chemicals is common.
Viton also offers excellent resistance to ozone, weathering, and UV radiation, which is comparable to or better than EPDM, another elastomer known for its weather resistance. However, Viton is generally more expensive than other elastomers, which can be a limiting factor for its use in cost-sensitive applications.
In terms of mechanical properties, Viton provides good compression set resistance and maintains its flexibility and sealing capabilities over a wide temperature range. However, it may not perform as well as silicone rubber in extremely low temperatures, where silicone remains more flexible.
Overall, Viton's unique combination of high-temperature stability, chemical resistance, and durability makes it a preferred choice for demanding applications, although its higher cost and limited low-temperature flexibility can be drawbacks compared to other elastomers like nitrile, EPDM, and silicone.