Spotlight on Viton®

Viton O ringsAn introduction to Viton

Viton or Fluorocarbon is a brand of synthetic rubber and fluoropolymer elastomer. Most commonly found in O-rings, chemical-resistant gloves, and other molded or extruded goods. It combines high temperature resistance with outstanding chemical resistance. This makes fluorocarbon based compounds almost ideal for a universal O Ring material. There is a demand for it in heavy industries such as oil and petroleum refineries, steel works and chemical plants, and also in industries with special requirements such as the food industry.

Viton® has become the most commonly associated name with this fluoropolymer family due to the aggressive marketing by DuPont.

Some of the key features of Viton

Viton is better able to withstand high temperatures while still retaining its superb mechanical properties in comparison to most other elastomers. Raised temperatures have virtually no effect on the  Chemical and oil resistance. Viton delivers incredibly good performance in oxygenated automotive fuels because of its low permeability to a vast range of substances. Furthermore it is very resistant to climatic conditions, sun and atmospheric oxidation.  Seals for Aircraft engines is probably one of the most key uses. In addition automotive fuel handling systems.  Also very good in hard vacuum service.

Compounds will remain elastic, even when exposed to laboratory air oven aging up to 204°C or to exposures up to 316°C if intermittently. This material has been used safely for some time in SCUBA diving by divers using gas blends referred to as nitrox. Viton has a lower probability of catching fire, even with the increased percentages of oxygen found in nitrox. It is also less susceptible to decay under increased oxygen conditions.  Float valves (“needle and seats”) for SU carburettors, also utilise this material for its fuel resistance and resiliency for sealing.

It’s not without its limitations. First of all,  fluorocarbon is not recommended for applications with exposure to ketones, amines or low molecular weight esters or ethers. Also for applications requiring good low temp flexibility, Vition would not be a recommended material.

In conclusion Viton/Flourocarbon is a wonderfully versatile material. Because there are many grades of Viton available please feel free to contact our sales team. With their extensive knowledge they will be able to answer any questions and offer product advice to ensure you gat the right seal for your application.

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