Viton is the brand name for a fluoropolymer elastomer and synthetic rubber that is used commonly in O-rings, along with other extruded or molded products. This category of elastomers is made up of Copolymers of Terpolymers of TFE (Tetrafluoroethylene), HFP (Hexafluoropropylene), and VF2 or VDF (Vinylidene Fluoride), along with PMVE (Perfluoromethylvinylether) that contains specialty polymer.
DuPont was the first company that marketed this category of materials, which is why Viton became the more common name associated with the fluoropolymer family. Viton polymers are made up of 4 families, while the fluorine-content of the more popular Viton grades typically varies between 66% and 70%. The primary grades are A (Dipolymers of VF2/HFP) that has a 66% fluorine content, B (Terpolymers of VF2/HFP/TFE) that is used more commonly for gaskets or seals, with a fluorine content of 68%, F (Terpolymers of VF2/HFP/TFE) used in automotive fuels that are oxygenated with a 70% fluorine content, and the specialty types which include Viton Extreme, GFLT, GBLT and GLT which are commonly used in oil exploration and various types of automotive applications.
Benefits Of Viton
When comparing Viton to many of the other elastomers, it can withstand higher temperatures better while at the same time maintaining its mechanical properties. Chemical and oil resistance also are unaffected by the elevated temperatures. The compounds found in Viton stay elastic when they are exposed to “laboratory” air-oven at exposures that are intermittent up to 315°C or aged up to 204°C. The Viton grades are also able to resist degradation from various fluids and chemicals, these include lubricants, fuels, oils along with many of the mineral acids more than any of the other types of non-fluorinated elastomers.
To put this is in simple terms, this means Viton offers superior fluid resistance out of all the commercial rubbers. With such a low permeability associated with so many substances, Viton delivers performance that is exceptionally good in the oxygenated-automotive fuels. However, rugged characteristics of Viton do not stop there. Due to the fact that they also offer great resistance when it comes to compression, even when exposed to the temperatures which make other types of non-fluorinated elastomers very brittle.
Viton is also very resistant when it comes to climatic conditions, atmospheric oxidation, mold and fungus. In addition, Viton offers great electrical properties in the low frequency and low voltage applications, along with lower burning characteristics.
Broad Chemical Compatibility
Viton and the materials that make up this product are compatible when it comes to a variety of chemicals. Some of these include:
– Hydraulic oil
– Fuel and lubricating oils
– Gasoline (high octane)
– Vegetable oils
– Diluted acids
A comparison between capabilities becomes important when considering changes in materials in order to accommodate operating conditions that are more severe or to increase reliability and production.
There are a variety of applications that require the rubber parts that are able to withstand stress from temperature excursions that are accidental, along with an increase in operating temperatures that allows for production increases. In some cases, Viton can continuously perform at 204°C, as well as at short excursions of temperatures up to 315°C. Some Viton rubber grades are also able to perform just as well in the temperatures that drop to -40°C.
When FDA compliance becomes necessary, there are specific Viton material types that match up to the FDA requirements for pharmaceutical and food applications.
Matches Stringent Environmental Regulations
As the environmental regulations continue to up stakes against leaks, spills and emissions, the Viton high-performance seals have managed to fill in the gaps when most of the other types of elastomers have fallen short.
Viton Rubber Uses
Viton is a highly durable material mainly used for seals, gaskets and O-rings. Viton tubing is commonly used for transportation and automotive fuel applications that involve biodiesel in high concentrations. Types F, which includes FKM-GF-S and FKM-GBL-S and Type B are more resistant when it comes to acidic biodiesel as this fuel type is oxidizing and unstable.
There are a variety of Viton grades, which is why it is very important to gain an understanding of requirements for an application to ensure the correct grade has been used.
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