What is the best O ring material for gasoline?
What is the best O ring material for gasoline?
Buna (Nitrile or NBR) O-rings: general purpose sealing Buna O-rings, also known as nitrile or NBR O-rings, offer excellent sealing and mechanical properties at a low cost. Buna O-rings have resistance to common lubricants and are recommended for crude oil, gasoline, propane, petroleum oils and water.
What is Viton Oring?
Viton™ is a fluoropolymer elastomer and synthetic rubber compound, trademarked by DuPont under this brand name. The standard grade for Viton™ is A grade, which has 66 percent fluorine content and is most commonly used in o rings and seals.
Is NBR toxic?
Nitrile, also known as Buna-N or NBR (nitrile-butadiene rubber) is a type of synthetic rubber polymer. Nitrile rubber is not toxic. Although acrylonitrile is a type of cyanide, it doesn’t break up into ions once dissolved in water, which gives the type of cyanide used as poison its deadly characteristics.
What is the difference between NBR and Viton® / FKM seals?
Standard NBR on the other hand is only effective for continuous sealing at temperatures up to +110°C (with short term sealing at 130°C.) At temperatures below -20°C, standard Viton/FKM seals are less effective as they become quite hard and inflexible. Special Viton® / FKM compounds can provide low temperature capabilities of -40°C.
What is the difference between Viton® and nitrile®?
Temperature: Nitrile is effective within a temperature range of -30 ° C to 100 ° C. General Suitability: Used for general purpose applications requiring resistance to aliphatic hydrocarbons, petroleum oils, water and hydraulic fluids. Environmental Properties: Nitrile vs Viton® is not resistant to degradation from weather and ozone exposure.
Are NBR and Viton® O-rings available at PolyMax?
However, we stock both NBR and Viton O-rings and seals AS/BS, metric, French, German and other metric series at Polymax. As Viton® properties are quite different from nitrile rubber properties. It is crucial to consider the pros and cons of both materials, specifically in the context of their application.
When should I use Viton™ /FKM/FPM instead of nitrile?
For example, if you know your assembly works at more than 100°C, nitrile will not be suitable. If your assembly is likely to be exposed to the weather, to UV or to ozone, nitrile will likely degrade and risk failure. Viton™ /FKM/FPM is superior to nitrile in almost all situations, excluding operation at sub zero temperatures.
