The World's First Fluoroelastomer- Viton
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The World's First Fluoroelastomer- Viton

The World's First Fluoroelastomer

Viton® fluoroelastomer is the most specified fluoroelastomer, well known for its excellent (400°F/200°C) heat resistance. Viton® offers excellent resistance to aggressive fuels and chemicals and has worldwide ISO 9000 registration.

DuPont Performance Elastomers has developed many types of Viton® to meet specific end-use and processing needs. There are differences between types of Viton® in terms of chemical resistance and mechanical properties.

Whether your application is pharmaceutical, food, chemical processing or any number of other industrial applications, there is a particular type of Viton® that best meets your specific performance requirements. The general purpose types differ primarily from the specialty types in chemical resistance. In the specialty family, the choice is among four types that are tailored for superior fluid resistance, low-temperature performance or combinations of these properties. In order to ensure product integrity and compliance to OSHA 1910.119 in finished parts made of Viton®, our seal helps guarantee that the parts you receive are made from 100% virgin Viton® from DuPont Performance Elastomers.

Technical Information:
Viton® consists of essentially four different "families" of polymers:

 

Viton®Family Product Types Principal End Users Polymer Composition Weight% Fluorine
A A, AL General purpose sealing: Automotive, Aerospace fuels & lubricants Dipolymers of VF2/HFP ~64-67%
B B, BL, GBL-S* Chemical Process plant, Power Utility Seals & Gaskets Terpolymers of VF2/HFP/TFE ~68%
F F, GF-S Oxygenated Automotive fuels. Concentrated aqueous inorganic acids, water, steam Terpolymers of VF2/HFP/TFE ~69-70%
Viton® Extreme™ TBR-S,ETP-S Automotive & Off-Road - High pH lubricants, greases, & Coolants.
Oil Exploration/Production - Drilling Muds, Sour Wells.
Special sealing requirements - solvents, coatings, ultra harsh environments (ETP)
Copolymers of TFE/Propylene and Ethylene/TFE/PMVE ~60% TBR-S
~66% ETP-S

*The new types of Viton® made with Advanced Polymer Architecture (APA) are indicated by an 'S'.

The four families differ primarily in the end-use performance of parts made from Viton®. Each family differs in its ability to: resist permeation and volume increase, resist attack and property degradation caused by the chemicals and fluids.

Speciality versions of A,B & F types are available in which HFP is replaced with a speciality monomer to improve low temperature flexibility. These are called LT types, for example, GLT-S, GBLT-S, and GFLT-S, and they perform like the A, B, and F families, respectively.

The choice of the most appropriate "family" of Viton to use for any given end-use application will be determined by the end-use service, and in particular, whether the finished part must provide:

  • Resistance to amines or caustics
  • Resistance to hydrocarbon fluids
  • Flexibility at low temperature (ability to maintain a seal at low temperature)