Viton® Seal
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Home > Viton® > Families

Viton® Consists of Four 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 ~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%
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 ~60-65%

*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)

The end-use performance capability of the various families of Viton differ primarily in terms of these three factors.

End-use service differences between Types of Viton®
Standard and Speciality Types Low Temp. Flexibility TR-10, °C Compression Set, O-rings 70 h/200°C, % Fluid Resistance Base Resistance
% Volume Increase after 168 h % loss of elongation at break
Toluene at 40°C Fuel C/MeOH (85/15) at 23°C Methanol at 23°C Concentrated H2SO4 at 70°C 33% solution of KOH 336h/40°C ASTM Ref. Oil 105 500h/150°C
AL -19 20-25 20-25 35-40 85-95 12-15 -50 -80
A -17 12-17 20-25 35-40 85-95 10-12 -45 -80
BL, GBL-S -15 25-40 12-15 20-25 25-35 3-5 -25 -65
B -13 25-30 12-15 18-23 25-35 8-10 -25 -70
ETP-S -11 45-50 6-8 8-10 1-2 4-6 0 -10
GFLT-S -24 35-40 8-12 10-15 3-5 3-5 -30 -40
GBLT-S -26 35-40 12-15 27-32 25-35 3-5 -40 -50
F -8 30-45 8-12 5-10 3-5 7-9 -50 -55
GF-S -8 30-45 8-12 5-10 3-5 7-9 -45 -50
TBR-S +3 45-50 60-65 80-90 - 3-5 -10 -20

Families of Viton

Next: Comparison of General Use and High Performance Grades

Viton® is a registered trademark of DuPont Performance Elastomers

 

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