Viton® 

Viton® is a Fluoroelastomer Rubber sheet that is resistant to a wide range of oils and solvents. It also exhibits good abrasion and tear resistance. The generic term for Viton® is FKM, but FKM is not Viton®. Viton® is made in the 9 different grades listed below.

Viton®

Fluoroelastomer

Only parts made with 100% virgin Viton® as the sole elastomeric component are labeled with this seal and made with material from DuPont Performance Elastomers.

Viton is a brand name for a type of fluoroelastomer rubber that has high resistance to heat, chemicals, and oils. It is commonly used for making gaskets and seals for various applications, such as automotive, aerospace, and chemical processing.

One of our websites that sells Viton gasket materials is https://www.sealsales.com. You can browse our catalog and find different sizes, shapes, and grades of Viton gaskets. We also provide technical specifications and data sheets for each product.

According to web search results, some of the advantages of Viton over other rubber materials are:

It can withstand high temperature (up to 200°C) without losing its mechanical properties or resistance to oil and chemicals. It has excellent resistance to a wide range of fluids, such as fuels, oils, acids, bases, solvents, and steam.
Viton  has low permeability to gases and liquids, which makes it suitable for sealing applications. Viton also has good resistance to weathering, ozone, and aging.

The disadvantages of Viton are:

It has poor low-temperature performance (below -15°C), which means it becomes stiff and brittle and loses its elasticity and sealing ability. It is not compatible with some fluids, such as ketones, amines, esters, hot water, and low molecular weight organic acids. Viton is more expensive than other rubber materials, which may limit its use in some applications.

Alternatives to Viton are:

EPDM (EPR): This is a type of ethylene propylene rubber that has good resistance to ozone, weathering, steam, and water. It also has better low-temperature performance than Viton. However, it is not compatible with oils, fuels, and solvents.

Silicone: This is a type of synthetic rubber that has excellent resistance to high and low temperatures, ozone, and weathering. It also has good electrical insulation properties. However, it is not resistant to oils, fuels, solvents, acids, and bases.

Nitrile (Buna-N): This is a type of acrylonitrile butadiene rubber that has good resistance to oils, fuels, and water. It also has good abrasion and tear resistance. However, it is not resistant to ozone, weathering, high temperatures, and some chemicals.

Aflas is a type of fluoroelastomer that is formulated from alternating polymers of tetrafluoroethylene and propylene1. It has some similar properties to Viton, such as high-temperature and chemical resistance, but it also has some differences.

Some of the advantages of Aflas over Viton are:

It has better resistance to steam, hot water, amines, bases, and some acids.  It has higher electrical conductivity and can be used for anti-static applications.

Some of the disadvantages of Aflas compared to Viton are:

Aflas has lower resistance to oils, fuels, and solvents. Aflas also has higher compression set and may lose its shape and sealing ability over time.

Therefore, Aflas can be used as a replacement for Viton in some applications, but not in others. It depends on the specific requirements and conditions of the application.

viton sheet

Viton® SPECIFICATION SHEET

  • Physical Properties:

  • Material: Viton®
  • Color: Black/Brown
  • Durometer Shore (Hardness) ± 5: 72 Shore A
  • Tensile Strength: 1285 PSI
  • Elongation, %: 286
  • Temperature Range °F: -40°F to 400°F (Depending on Grade, Viton GFLT Required for -40°F)
  • Average Weight (lb/sq. yd., 1/16″): 5.5

Viton® is a registered trade mark of DuPont Performance Elastomers.

We offer this information, recommendations and opinions for you to consider, inquire and verify. They do not guarantee or represent anything and we are not legally responsible for them. American Seal & Packing does not make any warranties about this data and does not take any responsibility for performance characteristics that may differ from laboratory tests due to different conditions.

Performance Differences Between Major Families of Viton™ Fluoroelastomers

 

 

 

Fluid Resistance: % Volume Increase After 168 Hours

Base Resistance: % Loss of Elongation @ Break.

Low Temp. Flexibility TR-10, ⁰C (°F)

Comp. Set: O-Rings, 70 Hrs @ 200 ⁰C (392 °F)

Toluene @ 40 ⁰C
(104 °F)

Fuel C/MeOH (85/15) @ 23 ⁰C
(73 °F)

Methanol @ 23 ⁰C
(73 °F)

Concentrated H2SO4 @ 70 ⁰C
(158 °F)

33% Solution of KOH: 336 Hr @ 40 ⁰C (104 °F)

ASTM Ref. Oil 105: 500 Hr @ 150 ⁰C
(302 °F)

GLT-S

-30 (-22)

30 - 35

20 - 25 -

35 - 40

90 - 100

3 - 5

-35

-65

AL

-19 (-2)

20 - 25

20 - 25

35 - 40

85 - 95

12 - 15

-50

-80

A

-17 (-1.4)

12 - 17

20 - 25

35 - 40

85 - 95

10 - 12

-45

-80

GBL-S

-16 (3.2)

25 - 40

12 - 15

20 - 25

25 - 35

3 - 5

-25

-65

B

-14 (6)

25 - 30

12 - 15

18 - 23

25 - 35

8 - 10

-25

-70

GFLT-S

-24 (-11)

35 - 40

8 - 12

10 - 15

3 -5

3 - 5

-30

-40

F

-8 (17.6)

30 - 35

8 - 12

5 - 10

3 - 5

7 - 9

-50

-55

GF-S

-8 (17.6)

30 - 45

8 - 12

5 - 10

3 - 5

7 - 9

-45

-50

ETP-S

-11 (12)

45 - 50

6 - 8

8 - 10

1 - 2

4 - 6

0

-10

Viton® Performance Differences.

viton performance differences

As you can tell from the charts above, there are multiple grades of Viton. The percentage of flourine and the method of curing determine the grade.  Each grade will perform differently in extreme applications.  The chart on the right indicates Dupont’s common material choices for oil service. The links below will take you to specific Viton product pages.

Viton Elastomers

Is Viton a solution for most applications?

Viton is an exceptional material and a problem solver for many applications, but like any elastomer, it does have its limits.  To overcome some of those limitations Dupont did develop multiple variations eight of which are shown above.  The significant changes are in the temperature range and the chemical resistance.  To determine which grade is best for your application, contact our experienced staff at American Seal & Packing

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