Selection Guide
Fluoroelastomers

Technical Information
Introduction

Viton™ is characterized by its:

Viton™ fluoroelastomer was introduced in 1957 tomeet the needs of the aerospace industry for a highperformance seal elastomer. Since then, the use of
Viton™ fluoroelastomer has expanded to many otherindustries, especially in the automotive, fluid power,
appliance, and chemical fields. With over half a century
of proven performance, Viton™ fluoroelastomer has
developed a reputation for outstanding performance inhigh temperature and extremely corrosive environments.

• Resistance to degradation by a greater variety of fluids
and chemicals than any other non-fluorinated elastomer.
Excellent resistance to oils, fuels, lubricants, and mostmineral acids.

Valuable Properties of Viton™ Fluoroelastomer
Vulcanizates based on Viton™ provide an exceptionalbalance of physical property characteristics, including
the following features:
Resistance to Temperature Extremes
Heat—Compared to most other elastomers, Viton™
is better able to withstand high temperature, while
simultaneously retaining its good mechanical properties.
Oil and chemical resistance are also essentially
unaffected by elevated temperatures. Compounds ofViton™ remain substantially elastic indefinitely when
exposed to laboratory air oven aging up to 204 °C(399 °F) or to intermittent exposures up to 316 °C(601 °F). High temperature service limits are generally
considered to be:– 3,000 hr at 232 °C (450 °F)– 1,000 hr at 260 °C (500 °F)– 240 hr at 288 °C (550 °F)– 48 hr at 316 °C (601 °F)
Cold—Viton™ low temperature performance is dependenton type, with serviceability as low as –31 °C (–24 °F) in
dynamic seals and –45 °C (–49 °F) in static seals using
Viton™ GLT-S.

• Extremely low permeability to a broad range ofsubstances, including particularly good performance inoxygenated automotive fuels.
• Resistance to aliphatic, aromatic hydrocarbons that
dissolve other rubbers.
• Exceptionally good resistance to compression set, even athigh temperatures.
• Exceptionally good resistance to atmospheric oxidation,sun, and weather. Excellent resistance to fungus and mold.
• Good electrical properties in low voltage, low frequency
applications.
• Low burning characteristics; inherently more resistant toburning than other, non-fluorinated hydrocarbon rubbers.
Safety and HandlingAs with many polymers, minute quantities of potentially
irritating or harmful gases may diffuse from uncured Viton™,
even at room temperature. Therefore, all containers shouldbe opened and used only in well-ventilated areas. In caseof eye contact, immediately flush the eyes for at least 15
minutes with water. Always wash contacted skin with soap
and water after handling Viton™.
Potential hazards, including the evolution of toxic vapors,
may arise during compounding, processing, and curingof raw polymers into finished products or under hightemperature service conditions. Therefore, before handlingor processing Viton™, make sure that you read and follow
the recommendations in the Chemours technical bulletin,“Handling Precautions for Viton™ and Related Chemicals.”Compounding ingredients and solvents that are used with
Viton™ to prepare finished products may present hazards inhandling and use. Before proceeding with any compoundingor processing work, consult and follow label directions andhandling precautions from suppliers of all ingredients.

Viton™

Fluoroelastomers

The Various Families and Types of Viton™
Fluoroelastomers

Viton™ GLT-S provides the same excellent resistanceto heat and fluids that is typical of the A types ofViton™ fluoroelastomer. Viton™ GFLT-S, like Viton™
GLT-S, exhibits significantly improved low temperature
flex characteristics compared to standard types offluoroelastomer. In addition, Viton™ GFLT-S provides thesame superior resistance to fluids that is typical of the
F types of Viton™ fluoroelastomer.

Standard types of Viton™ fluoroelastomer products
are designated as A, B, or F according to their relative
resistance to attack by fluids and chemicals. The
differences in fluid resistance are the result of different
levels of fluorine in the polymer, which is determinedby the types and relative amounts of copolymerizedmonomers that comprise the polymer.

Types of Viton™ Extreme™

In general, Viton™ exhibits outstanding resistance toattack from a wide variety of fluids, including mineralacids, and aliphatic and aromatic hydrocarbons. The
higher the fluorine content of the polymer, the less will be
the effect, as measured by volume increase for example.
The most significant differences between A, B, and F
types of Viton™, in terms of resistance to volume changeor retention of physical properties, are exhibited in low
molecular weight, oxygenated solvents (such as methanol
and methyl t-butyl ether).

Fluoroelastomers that contain copolymerized vinylidene
fluoride (VF2) are subject to attack by high pH materials,
including caustics and amines. In addition, standard
fluoroelastomers are not resistant to low molecularweight carbonyl compounds, such as methyl ethyl ketone,
acetone, or methyl tertiarybutyl ether.
Viton™ Extreme™ ETP-600S is a copolymer of ethylene,
tetrafluoroethylene (TFE), and perfluoromethylvinyl ether(PMVE). This unique combination of monomers provides
outstanding resistance to fluids and is an example ofan ETP polymer. The ETP types of Viton™ exhibit thesame excellent resistance to acids and hydrocarbons
typical of A, B, and F types of Viton™. Unlike conventional
fluoroelastomers, however, ETP types of Viton™ also
provide excellent resistance to low molecular weight
esters, ketones, and aldehydes. In addition, these uniquepolymers are inherently resistant to attack by base and,thus, provide excellent resistance to volume swell andproperty loss in highly caustic solutions and amines.

As mentioned above, the fluid resistance of Viton™ A, B,
and F types improves with increasing fluorine levels. Thisis shown in Table 1 (note the volume increase after aging
in methanol at 23 °C [73 °F]). As the fluorine content
increases, however, the low temperature flexibility of thepolymer decreases, and a compromise must be madebetween fluid resistance and low temperature flexibilityof the final vulcanizate.
For those applications that require the best performancein both fluid resistance and low temperature flexibility, anumber of specialty types of Viton™ were developed that
contain a copolymerized fluorinated vinyl ether monomer.
Polymers that contain this monomer exhibit significantly
improved low temperature flexibility, compared tostandard types of fluoroelastomer.

Additional information regarding performance differences
between the various families and types of Viton™
fluoroelastomer is presented in Tables 3–6 to assist
in selecting the particular grade of Viton™ that is best
suited for both a given end-use application and a specificmanufacturing process.

Table 1. Polymer Fluorine Content Versus Fluid Resistance and Low Temperature Flexibility
Standard Types

Specialty Types

A

B

F

GLT-S

GFLT-S

ETP-S

Nominal Polymer Fluorine Content, wt%

66

68

70

64

67

67

Percent Volume Change in Fuel C, 168 hr at 23 °C (73 °F)*

4

3

2

5

2

4

Percent Volume Change in Methanol, 168 hr at 23 °C (73 °F)*

90

40

5

90

5

5

Percent Volume Change in Methyl Ethyl Ketone, 168 hr at 23 °C (73 °F)*

>200

>200

>200

>200

>200

19

Percent Volume Change in 30% Potassium Hydroxide, 168 hr at 70 °C (158 °F)*
Low Temperature Flexibility, TR-10, °C*(Samples too swollen and degraded to test)
–17

–13

–6

–30

14
–24

–12

*Nominal values, based on results typical of those obtained from testing a standard, 30 phr MT (N990) carbon black-filled, 75 durometer vulcanizate. These are not intended to serve as
specifications.

2Viton™

Fluoroelastomers

Curing Systems for Viton™ Fluoroelastomer

cross-linking systems. When properly formulated, peroxidecross-linking provides enhanced resistance to aggressive
automotive lubricating oils, steam, mineral and organic
acids, and aggressive biodiesel. Generally, vulcanizates ofViton™ fluoroelastomers cured with peroxide do not show
any significant difference in resistance to hydrocarbon
fluids compared to a polymer of similar fluorine content
cured with bisphenol.

In addition to inherent differences between the various
types and families of Viton™ fluoroelastomer, a numberof compounding variables have major effects on thephysical property characteristics of the final vulcanizates.
One very important variable is the cross-linking or curingsystem that is used to vulcanize the elastomer.
Diamine curatives were introduced in 1957 for crosslinking Viton™ A. While these diamine curatives are
relatively slow curing and do not provide the best possible
resistance to compression set, they do offer uniqueadvantages. For example, compounds cured with diamines
exhibit excellent adhesion to metal inserts and high hot
tensile strength.

In 2003, a series of peroxide-cure types of Viton™
made with Advanced Polymer Architecture (APA) was
introduced. These polymers, designated as APA polymers
by having an “S” suffix on the product name, incorporate asignificantly improved cure site. As a result, they provide
substantially better processing and physical properties,
compared to the original, non-APA peroxide-cure types
of Viton™. A comparison of the various processing andphysical property characteristics of compounds using thevarious cure systems is shown in Table 2.

Most fluoroelastomers are cross-linked with Bisphenol
AF, a curative introduced in 1970 in the first commercial
curative-containing precompound, Viton™ E-60C.
Compounds of Viton™ that use this curative exhibit fast
rates of cure and excellent scorch safety and resistanceto compression set.

Selecting a Specific Type of Viton™ Fluoroelastomer
Inherent Physical Property Differences Between Types/
Families of Viton™ Products

In 1987, an improved bisphenol curative was introduced,
which was made available in several different
precompounds. The modified system provides fastercure rates, improved mold release, and slightly better
resistance to compression set, compared to the originalbisphenol cure system used in Viton™ E-60C and E-430.
Additional precompounds of Viton™, incorporating thismodified curative, were introduced in 1993, including
Viton™ A-331C, A-361C, B-601C, and B-651C. A brief
description of all these products can be found in Table 6.

The physical properties of vulcanizates based on Viton™
fluoroelastomers are determined to a large extent by thetype and amount of the filler(s) and curative(s) used in theformulation and by the temperature and duration of thecuring cycle used in their manufacture.
In terms of resistance to compression set, lowtemperature flexibility, and resistance to certain classesof fluids, however, some inherent differences exist among
the various families of Viton™ fluoroelastomers. These are
the result of differences in the relative amount and type ofmonomers used in the manufacture of the various types
of Viton™ fluoroelastomers.

Peroxide cross-linking provides fast cure rates andexcellent physical properties and allows cross-linkingof polymers, such as GLT-S and GFLT-S, which cannot
be readily cured with either diamine or bisphenol

Table 2. A Comparison of Cure Systems Used in Cross-Linking Viton™
Type of Cure System
Property, Processing Characteristic

DiamineBisphenol

Peroxide

Processing Safety (Scorch)

P-F

E

E

Fast Cure Rate

P-F

E

E

Mold Release/Mold Fouling

P

G-E

G-E

Adhesion to Metal Inserts

E

G

G

Compression Set Resistance

P

E

E

Steam, Water, Acid Resistance

F

G

E

Flex Fatigue Resistance

G

G

G

Rating: E=Excellent, G=Good, F=Fair, P=Poor3

Viton™

Fluoroelastomers

The differences in physical property characteristics
that exist between various types and families of Viton™
fluoroelastomer products are outlined in general termsin Table 3.

Selecting a Specific Type of Viton™ Fluoroelastomer
Differences in Fluid Resistance Among Types of Viton™ Products
As in the case of physical properties, different polymer
compositions will result in inherent differences with regard
to fluid resistance.

As an example, resistance to compression set is an
important property for seals, and if this property wereconsidered to be the most important feature for aparticular part, then one of the A-types of Viton™ might
be the best choice for the application. However, if
resistance to the widest possible range of fluids is amore important consideration, then an F-type Viton™
fluoroelastomer might be a better choice for thatparticular end-use application. Further, if both fluid
resistance and low temperature flexibility are equallyimportant requirements for maximizing the end-use
suitability of a given part, GFLT types of Viton™ would
represent the best overall choice.

Table 4 outlines the differences that exist among types
of Viton™ products, in terms of their resistance to various
classes of fluids and chemicals.
Because as certain types of Viton™ products may exhibit
performance that is superior to other types in one
regard, but not quite as good in some other aspect, it
is important to consider the requirements of the partto be manufactured, in terms of both physical property
requirements and fluid or chemical resistance needs.
Using Tables 3 and 4, the compounder can select the best
type of Viton™ product for a given end-use application, basedon the best combination of physical property and fluid
resistance characteristics.

Table 3. Physical Property Differences Among Types/Families of Viton™ ProductsType of Viton™ Fluoroelastomer

Resistance to Compression Set

General Fluids/Chemical Resistance*

Low Temperature Flexibility**

A

1

3

3

B, GBL-S

2

3

3

F, GF-S

3

2

3

GLT-S

2

3

1

GFLT-S

2

2

2

ETP-S

3

1

3

1=Excellent—Best performance capability of all types; 2=Very Good; 3=Good—Sufficient for all typical fluoroelastomer applications*See Table 4 for a detailed guide to choosing the best type of Viton™ fluoroelastomer relative to specific classes of fluids and chemicals.
**Flexibility, as measured by Temperature of Retraction (TR-10), Gehman Torsional Modulus, Glass Transition (Tg), or Clash-Berg Temperature. Brittle-Point tests are a measure of impact
resistance only and do not correlate at all with the low temperature sealing capability of a vulcanizate.

Table 4. Differences in Fluid Resistance Among Types of Viton™ Fluoroelastomer
Type of Viton™ Fluoroelastomer

A

Cure System

B

F

GAL-S

GBL-S

GF-S

Bisphenol

GLT-S

GFLT-S

ETP-S

PeroxideHydrocarbon Automotive, Aviation Fuels

1

1

1

1

1

1

1

1

1

Oxygenated Automotive Fuels (containing MeOH, EtOH, MTBE, etc.)

NR

2

1

NR

2

1

NR

1

1

Reciprocating Engine Lubricating Oils (SE-SF Grades)

2

1

1

1

1

1

1

1

1

Reciprocating Engine Lubricating Oils (SG-SH Grades)

3

2

2

1

1

1

1

1

1

Aliphatic Hydrocarbon Process Fluids, Chemicals

1

1

1

1

1

1

2

1

1

Aromatic Hydrocarbon Process Fluids, Chemicals

2

2

1

1

1

1

2

1

1

Aqueous Fluids: Water, Steam, Mineral Acids (H2SO4, HNO3, HCl, etc.)

3

2

2

1

1

1

1

1

1

Amines, High pH Caustics (KOH, NaOH, etc.)

NR

NR

NR

3

3

3

3

3

1

Low Molecular Weight Carbonyls (MTBE, MEK, MIBK, etc.)

NR

NR

NR

NR

NR

NR

NR

NR

1

1=Excellent—Best choice of Viton™ type(s) for service in this class of fluid/chemical; minimal volume increase, change in physical properties.
2=Very Good—Good serviceability in this class of fluid/chemical; small amounts of volume increase and/or changes in physical properties.
3=Good—Suitable for use in this class of fluid/chemical; acceptable amounts of volume increase and/or changes in physical properties.
NR=Not Recommended—Excessive volume increase or change in physical properties.

4

Viton™

Fluoroelastomers

Viton™ Product Naming System

3rd Character (Number)With the introduction of six improved processing
precompounds in 1993, a new nomenclature system
was adopted for Viton™ fluoroelastomer products. The
new system incorporates the following information in a
product name:

Represents the relative level of curative in a precompoundon a scale of 10 to 1 (10 is represented by 0);
0 = High curative level (for optimum compression set)
9 to 2 = Intermediate, decreasing levels of curative(increased elongation at break, tear resistance)• Nominal Mooney Viscosity

1 = Low curative level (for optimum tear, flex resistance)• Family type (relative fluid resistance)

4th Character (Number)• Relative state of cure (relative level of cross-linking
agent present in curative-containing precompounds)

Represents a slightly different version of a particularprecompound• An indication of whether the product can be crosslinked using a peroxide cure system

5th Character (Letter)• An indication of whether the product is a gum polymer
or a precompound, which contains a preset, carefully
controlled amount of bisphenol cross-linking system.

• Absence of a letter suffix indicates that the productis a gum polymer only and contains no curatives (maycontain process aid)

Each character in the product name indicates a specificcharacteristic as outlined below:• “C” indicates that the product is a precompound,containing accelerator and curative

Character No.:

1st|

• “S” indicates that the product incorporates Viton™ madewith APA technology

|

3rd

5th

|

Viton A-401C
™

|

2nd

Choosing a Viton™ Product for Use in a Particular Typeof Manufacturing Process|

4th

The Viton™ product line includes a wide variety of different
types of fluoroelastomer products, which exhibit someinherent differences in their end-use capabilities (seeTables 3 and 4). In addition, a broad range of viscosities isoffered for most types of Viton™, providing a wide degreeof utility in various manufacturing processes.

1st Character (Letter)• Represents the Viton™ fluoroelastomer family—A, B, F,
or ETP• A “G” prefix, in addition to a family prefix, indicates thatthe polymer can be cross-linked with the peroxide curesystemHaving selected a given class of Viton™ products foran end use, the compounder must then choose which
particular Viton™ product is best suited for use in a
specific manufacturing process.

• An “L” designation indicates that the A, B, or F type
polymer provides slightly improved low temperature
flexibility characteristics versus other polymers
within the same family; an “LT” designation indicatesa more significant improvement in low temperature
performance criteria

The Viton™ Application Guide (Table 5) lists the Viton™
products that are recommended for particular end-use
applications, according to the various processes that are
most commonly used in their manufacture.
The Viton™ Product Listing (Table 6) provides more
specific information about the various individual Viton™
products. Contact your Chemours’ sales or technicalrepresentative to obtain more detailed information or dataon specific Viton™ products.

2nd Character (Number)
Represents nominal Mooney Viscosity of the product—
ML 1 + 10 at 121 °C (250 °F).

5

Viton™

Fluoroelastomers

Each general end-use category listed is divided into fourcolumns, each listing Viton™ products within a specificfamily or type of Viton™ fluoroelastomer—A, B, F, andspecialty types.

How to Use the Viton™ Application Guide
The Viton Application Guide (Table 5) has been designed
to facilitate choice of the type of Viton™ that is best
suited for meeting both the property requirements of theintended end use and the needs of the production method
used to manufacture the finished product.
™

The guide is further divided into the five major types ofprocess (rows) by which these general end-use categories
might be produced:

The guide is divided into five general categories (columns)of end-use products, differentiated primarily by physicalform:• Compression molding• Transfer molding• Sheet form goods, such as gaskets, diaphragms, etc.

• Injection molding• Simple shapes, such as O-rings, V-rings, etc., which
do not typically require high levels of de-molding tearresistance, but that generally require high states ofcure to obtain the best compression set possible.

• Extrusion• Calendering
Within the blocks formed by the “intersection” of a given
end-use category (column) and the process type by which
the end products will be manufactured (row), we havelisted the types of Viton™ that we believe are appropriate
choices for meeting the physical property requirementsof the finished product and are best suited for the chosen
manufacturing process.

• Complicated molded shapes, such as shaft seals or
valve stem seals, which require good hot tear uponde-molding due to the undercuts in the molds used toform such parts and good adhesion to metal inserts(obtained during the vulcanization of the parts).
• Complicated molded shapes that do not involve
adhesion to metal inserts during vulcanization,
but which require good resistance to tear during
de-molding. Carburetor roll-over cages, boots, and reedvalves are examples of such parts.

The Viton™ products we believe will provide the best
combination of end-use physical properties, together withthe best processing characteristics for given methods ofmanufacture, are listed in bold type.

• Extruded shapes, such as rod, tubing, or hose
constructions.

Additional details for specific types of Viton™ can be foundin the Viton™ Product Listing and in product-specific data
sheets.

6

Viton™

Fluoroelastomers

Table 5. Viton™ Fluoroelastomer Application Guide
Manufacturing
Process

Reinforced/Unreinforced Sheet Stock (Gaskets, Diaphragms, etc.)

Molded (Non-Bonded), Simple Shapes (O-Rings, V-Rings, etc.)

Viton™ Types
A

B

F

Specialty

A

B

F

Specialty

B-435C
B-601C
B-651C
GBL-600S
B-600

F-605CGF-600S

GLT-600S
GFLT-600S
ETP-600S

A-401C
A-331C
A-601C
A-500
A-HV
A-700
AL-600B-601C
B-651C
GBL-600S
B-600

F-605CGF-600S

Compression
Molding

A-331C
A-361C
A-401C
A-601C
A-500
A-700
AL-600

GLT-600S
GFLT-600S
ETP-600S

B-435C
GBL-200S
B-202

F-605CGF-200S

GLT-200S
GFLT-200S
ETP-600S

A-201C
A-331C
A-361C
A-200
AL-300

B-651C
GBL-200S
B-202

F-605CGF-200S

Transfer Molding

A-201C
A-331C
A-361C
A-401C
A-200
AL-300

GLT-200S
GFLT-200S
ETP-600S

A-201C
A-331C
A-361C
A-200
AL-300B-435C
GBL-200S
B-202

GF-200S

GLT-200S
GBLT-200S
GFLT-200S

A-201C
A-331C
A-361C
A-100
A-200
A-500
AL-300B-601C
B-651C
GBL-200S
B-202

F-605CGF-200S

GLT-200S
GFLT-200S
ETP-600S

A-201C
A-401C
A-331C
A-361C
AL-300B-435C
B-601C
B-651C
GBL-200S
GBL-600S
B-202
B-600

F-605CGF-200S
GF-600S

GLT-200S
GLT-600S
GFLT-200S
GFLT-600S
ETP-600S

—

—

—

—

Injection Molding

Calendering

Molded (Bonded), Complicated Shapes (Valve Stem, Shaft Seals, etc.)

Compression
Molding

Transfer Molding

Injection Molding

Manufacturing
Process

Extrusion

Molded (Non-Bonded), Complicated Shapes (Boots, Valves, etc.)

A-361C
A-500
A-700
AHV
AL-600B-435C
B-651C
GBL-600S
B-600

F-605C/GF-200S
GF-200S
GF-600S

GLT-200S
GLT-600S
GFLT-200S
GFLT-600S
ETP-600S

A-331C
A-401C/A-500
A-601C/A-200
A-361C
A-700
AHV
AL-600B-435C
B-651C
GBL-600S
B-600

F-605C/GF-600S
GF-600S

GLT-600S
GFLT-600S
ETP-600S

A-361C
A-200
A-500
AL-300B-435C
GBL-200S
B-202

GF-200S

GLT-200S
GFLT-200S
ETP-600S

A-200
A-331C
A-361C
A-200
A-500
AL-300B-435C
B-651C
GBL-200S
B-600

F-605C/GF-200S
GF-300

GLT-200S
GFLT-200S
ETP-600S

A-361C
A-100
A-200
A-500
AL-300B-435C
B-651C
GBL-200S
B-202

F-605C/GF-200S
GF-200S

GLT-200S
GFLT-200S

A-200
A-331C
A-361C
A-200
A-500
AL-300B-435C
B-651C
GBL-200S
B-202

F-605C/GF-200S
GF-200S

GLT-200S
GFLT-200S

Extruded Goods (Hose, Tubing, Extruded Profiles, etc.)
Viton™ Types
A

B

F

Specialty

A-201C
A-401C
A-361C
A-200
A-500
AL-300B-435C
B-651C
GBL-200S
B-202
B-600

F-605CGF-200S

GLT-200S
GFLT-200S
ETP-600S

7

Viton™

Fluoroelastomers

Table 6. Viton™ Fluoroelastomer Product Listing
Polymer Properties

Viton™
Product
Type

NominalViscosity,
ML1 + 10
at 121 °C(250 °F)

Specific
GravityNominal Physical Properties*

VolumeIncrease,
Polymer Compression Temperature
After 7 days/ofSet, %
Fluorine
Content, 70 hr/200 °C Retraction MeOH/23 °C(73 °F)(TR-10), °C(392 °F)%

Viton™
Fluoroelastomer
Product
Description

Viton™
Fluoroelastomer
Product Suggested
Uses/Applications

A-Types: Curative-Containing Precompounds
A-201C

A-331C

A-361C

A-401C

A-601C

20

30

30

40

60

1.81

1.81

1.81

1.81

66.0

66.0

66.0

66.0

15

20

20

15

–17

Fast cure rate, excellent+75 to 105% injection molding
rheology, mold release

Injection molding, O-rings,
gaskets, extruded shapes–17

Excellent mold flow,+75 to 105% high elongation/tearresistanceCompression—injection
molding of complex
shapes, requiring maximum
hot tear–17

Excellent mold flow, tear
+75 to 105% resistance, bonding tometal inserts

Compression—injection
molding of complex
shapes, bonded metal
inserts–17

Excellent rheology
at high shear rates,+75 to 105%
excellent resistance tocompression set

Compression, transfer, or
injection molding of O-rings

Compression molding ofO-rings, simple shapes

Coatings, viscosity modifierfor higher viscosity types

1.81

66.0

12

–17

High viscosity,
high state of cure;+75 to 105%
optimum resistance tocompression set

A-Types: Gum Polymers
A-100

10

1.82

66.0

15

–17

Ultra-low viscosity:+75 to 105% excellent polymer
rheology

A-200

20

1.82

66.0

15

–17

+75 to 105%

A-500

50

1.82

66.0

15

–17

Intermediate viscosity:+75 to 105% excellent polymer
rheology

Cured with VC-50:
compression, transfer,
injection molding

A-700

70

1.82

66.0

15

–17

+75 to 105%High viscosity: excellent
physical properties

Cured with VC-50:
compression, transfer,
injection molding

A-HV

160

1.82

66.0

15

–17

Ultra-high viscosity:+75 to 105% excellent physicalproperties

Cured with VC-50:
compression molding, highstrength vulcanizates–19

Slightly improved low+75 to 105% temperature flexibility.
Low viscosity

Transfer, or injection
molded goods, whereA-types are marginal in
low-temperature flexibility
General molded goods,
where A-types are marginalin low-temperature
flexibility
FDA-compliant**: injection,transfer, or compression
molded goods

AL-300

30

1.77

66.0

25

Low viscosity: excellent
polymer rheology

AL-600

60

1.77

66.0

20

–19

Slightly improved low+75 to 105% temperature flexibility.
Medium viscosity

GAL-200S

25

1.79

66.0

30

–19

Excellent resistance to+75 to 105% automotive lubricating
oils, aqueous fluids

Cured with VC-50: injection
molding applications

continued
8Viton™

Fluoroelastomers

Table 6. Viton™ Fluoroelastomer Product Listing (continued)
Polymer Properties

Viton™
Product
Type

NominalViscosity,
ML1 + 10
at 121 °C(250 °F)

Specific
GravityNominal Physical Properties*

VolumeIncrease,
Polymer Compression Temperature
After 7 days/ofSet, %
Fluorine
Content, 70 hr/200 °C Retraction MeOH/23 °C(73 °F)(TR-10), °C(392 °F)%

Viton™
Fluoroelastomer
Product
Description

Viton™
Fluoroelastomer
Product Suggested
Uses/Applications

B-Types: Curative-Containing Precompounds
B-435C

40

1.85

68.5

25

–14

+35 to 45%

Improved processing/mold release/bonding vs.
B-641C, B-651C

Injection—compression
molding of metal-bonded
parts

B-601C

60

1.85

68.5

20

–14

+35 to 45%

Excellent balanceof resistance tocompression set/fluids

Compression—injection
molding of O-rings, simple
shapes+35 to 45%

Excellent mold flow, very
good tear resistance,
bonding to metal inserts

Compression—injection
molding of complex
shapes, bonded metal
inserts+40 to 50%

Excellent resistance toautomotive lubricating
oils, aqueous fluids

FDA-compliant**:transfer—compression
molding auto lubricating oil,coolant system seals
FDA-compliant**:
compression molding
automotive lubricating oil,coolant system seals

B-651C

60

1.85

68.5

30

–14

B-Types: Gum Polymers
GBL-200S

20-30

1.85

67.0

30

–16

GBL-600S

65

1.85

67.0

30

–16

+40 to 50%

Excellent resistance toautomotive lubricating
oils, aqueous fluids

B-202

20

1.86

68.5

25

–14

+35 to 45%

Excellent extrudability;
lower MeOH permeability
than A-types

High shear extrusion
applications—fuel hoseveneer, coatings+35 to 45%

Intermediate viscosity,
excellent polymer
rheology, superior fluids
resistanceCompression, transfer, andinjection molding+5 to 10%

Improved polymer basevs. F-601C—improved
rheology, compression
setCompression molded
goods requiring best fluids
resistance+3 to 5%Low viscosity version of
GF-600S

FDA-compliant**: injection
transfer, or compression
molded goods requiring
best fluids resistance+3 to 5%

Superior resistance tobroad range of fluids
and chemicals, including
MeOH

FDA-compliant**:
compression molded
goods requiring best fluids
resistance

B-600

60

1.86

68.5

20

–14

F-Types: Curative-Containing Precompounds
F-605C

60

1.90

69.5

30

–8

F-Types: Gum Polymers
GF-200S

GF-600S

25–30

65

1.91

1.91

70.0

70.0

35

35

–6

–6

continued

9Viton™

Fluoroelastomers

Table 6. Viton™ Fluoroelastomer Product Listing (continued)
Polymer Properties

Viton™
Product
Type

NominalViscosity,
ML1 + 10
at 121 °C(250 °F)

Specific
GravityNominal Physical Properties*

VolumeIncrease,
Polymer Compression Temperature
After 7 days/ofSet, %
Fluorine
Content, 70 hr/200 °C Retraction MeOH/23 °C(73 °F)(TR-10), °C(392 °F)%

Viton™
Fluoroelastomer
Product
Description

Viton™
Fluoroelastomer
Product Suggested
Uses/Applications

Low-Temperature Types of Viton™ Polymer
GLT Types
GLT-200S

GLT-600S

25–30

65

1.78

1.78

64.0

64.0

30

35

–30

20–30 Mooney GLT: best
+75 to 105% FKM low-temperature
flexibility

Injection—transfer molded
automotive fuel, chemical,
petroleum industry seals–30

Medium viscosity version+75 to 105%of GLT

Transfer—compression
molded automotive fuel,chemical, petroleum
industry seals–24+5 to 10%30 ML GFLT: best
combination of lowtemperature flexibility/
fluids resistance

FDA-compliant**:
bonded fuel systems parts:
resistance to oxygenates,
low-temperature flexibility+5 to 10%65 ML GFLT: best
combination of lowtemperature flexibility/
fluids resistance

FDA-compliant**:
bonded fuel systems parts:
resistance to oxygenates,
low-temperature flexibility+10 to 15%

Outstanding resistanceto fluids/chemicals,
including low molecularweight acids, aldehydes,
ketones

FDA-compliant**:transfer—compression
molded seals, gaskets

GFLT Types
GFLT-200S

GFLT-600S

25–30

65

1.86

1.86

66.5

66.5

35

40

–24

Viton™ Extreme™ Types

ETP-600S

60

1.82

67.0

40

–12

*Nominal physical properties typical of those that can be expected of vulcanizates based on the specific type of Viton™ noted, in a 70A hardness, MT carbon black-filled formulation.
These are not intended to serve as specifications.
**Various types of Viton™ curative-containing precompounds have been determined to be in compliance with FDA 21 CFR-177.2600—Rubber Articles for Repeated Food Contact.

Applications• Filter caps and filter seals

Automotive• Fuel sender seals, carburetor needle tips

Parts produced from Viton™ fluoroelastomer are widelyused in the automotive industry because of theiroutstanding heat and fluid resistance. They are used in
the following areas:

Appliances
The heat and fluid resistance of Viton™ fluoroelastomer,
coupled with its good mechanical strength, makes it anatural choice for many appliance parts. The use of seals
and gaskets of Viton™ has resulted in design of appliancesin challenging environments. Here are some typicalsuccess stories:

Powertrain Systems• Crankshaft seals, valve stem seals, transmission seals• Air intake manifold gaskets• In one commercial automatic dry cleaning machine,no less than 107 components are made of Viton™:door seals, sleeve-type duct couplings, shaft seals,
O-rings, and various static gaskets. They perform
in an atmosphere of perchloroethylene fumes attemperatures up to 88 °C (190 °F), conditions thatwould quickly degrade other elastomers.

Fuel Systems• Veneered fuel hose
• In-tank fuel hose and tubing• Pump seals, diaphragms and injector O-rings• Accelerator pump cups
10

Viton™

Fluoroelastomers• A fluid-activated diaphragm-type thermostat for gas
or electric ranges owes its success to the designer’s
choice of Viton™ for the actuator element. Because
Viton™ adheres well to brass, it is virtually impermeable
to and is not swelled or deteriorated by the fluids used,
can withstand operating temperatures of 149–204 °C(300–399 °F), and has the mechanical strength toresist repeated flexing.

• Tubing and seals for a variety of top-quality industrial
instruments• Compression pads for heavy-duty vibration mounts
used for portable missile ground control apparatus• Conveyor rolls for a solvent cleaning machine• Packing rings for hydraulic activators on steel mill ladles• Clamp cushions for parts dipped in 285 °C (545 °F)
solderChemical Industry• Jacketing for steel mill signal cable

Viton™ fluoroelastomer is essentially a universal seal
for chemical process equipment. Its application in thechemical industry is illustrated by the following examples:• Deflector rolls on high-speed tinplating lines• Precision-molded balls for check valves in oil orchemical service• In a pumping station that handles more than 80
different solvents, oils, and chemicals, seals of Viton™
are used in the piping’s swivel and telescoping joints.
When these joints were inspected after two years’service, they were found to be as good as new.

• O-ring seals for test equipment in an automotive
manufacturer’s experimental lab
Aerospace• Valves lined with Viton™ reduce heat and corrosion
worries in many plants.

• Viton™ replaced caulking on a process equipment
enclosure, previously plagued with hot solvent leaks,
and saved $4,000 per year in maintenance costs.

Reliability of materials under extreme exposure conditions
is a prime requisite in this field. Aircraft designers
report that O-rings of Viton™ fluoroelastomer provide
outstanding performance over a broad thermal range,from low to extremely high temperatures, and that Viton™
exhibits “long and consistent life,” even at the upper endof this range. Higher temperatures can be tolerated forshort periods. Viton™ also resists the effects of thermal
cycling, encountered in rapid ascent to and descent fromthe stratosphere. Other desirable characteristics ofViton™ that are pertinent to aerospace applications are
its excellent abrasion resistance and its ability to seal
against “hard” vacuum, as low as 10–9 mm Hg (133 nPa),
absolute.

• Aerosol-propelled solvent solutions of Viton™ aresprayed on chemical process equipment as multipurpose maintenance coatings.

The high-performance properties of Viton™ have been
demonstrated in these typical aircraft and missile
components:• Hose made of Viton™ transfers solvents and reactive
petrochemicals to and from processing and distribution
facilities. There are installations on ocean tankers aswell as on highway trailers.
• Processing rolls for hot or corrosive service are covered
with Viton™.
• Flange gaskets for glass-bodied valves in a paper
bleaching plant are of Viton™.

• O-rings and Manifold gaskets

Industrial Use• Coated fabric covers for jet engine exhausts between
flights

The good mechanical properties of Viton™ fluoroelastomer
allows replacement of conventional elastomers in a range
of applications that cut across industry lines. To cite a few:

• Firewall seals• Stable-dimensioned O-rings in the meters of automatic
gasoline blending pumps• Abrasion-resistant solution coating over braidsheathed ignition cable• High vacuum seals for the world’s most powerful proton
accelerator• Clips for jet engine wiring harnesses• Heat- and corrosion-resistant expansion joints for autility company’s stack gas exhaust ducts• Siphon hose for hot engine lubricants• Tire valve stem seals

11Viton™

Fluid Power
Designers and engineers are discovering that seals ofViton™ fluoroelastomer work better and last longer thanany other rubber in most fluid power applications. Viton™
seals effectively up to 204 °C (399 °F) and is unaffectedby most hydraulic fluids, including the fire-resistanttypes. Seals of Viton™ can also cut maintenance costs
under more moderate service conditions (below 121 °C[250 °F]) by providing longer, uninterrupted seal reliability.
Some applications in which seals of Viton™ can reduce
fluid loss and minimize downtime include the following:• Actuators are the hydraulic components most likely
to develop small, steady leaks when rubber seals wear

Fluoroelastomers

and lose resilience, which can be extremely expensive.
In a working year, day-to-day leakage from the average
hydraulic system wastes enough fluid to completely
fill the system more than four times. Viton™ preventsor reduces leakage by maintaining its toughness andresilience longer than other rubber seal materials undernormal fluid power conditions.
• In pumps, poor sealing performance increases
operating costs by wasting power. When internal seals
lose resilience and allow more slippage than the pumpdesign permits, power is wasted. When seals swelland drag, power is wasted. Seals of Viton™ keep theirresilience and don’t swell, thus preventing power waste
and helping hold down operating costs.

Test Procedures
Property Measured

Test Procedure

Compression Set

ASTM D3955, Method B (25% deflection)

Compression Set—Low Temperature

ASTM D1299, Method B (25% deflection)

Compression Set, O-Rings

ASTM D1414

Hardness

ASTM D2240, durometer A

Mooney Scorch

ASTM D1646, using the small rotor. Minimum viscosity and time to a1-, 5-, or 10-unit rise are reported.

Mooney Viscosity

ASTM D1646, ten pass 100 °C (212 °F) and 121 °C (250 °F)

ODR (vulcanization characteristics measured with an oscillating disk cure meter)

ASTM D2084

Property Change After Oven Heat-Aging

ASTM D573

Stress/Strain Properties
100% Modulus
Tensile Strength
Elongation at BreakASTM D412, pulled at 8.5 mm/sec (20 in/min)

Stiffness, Torsional, Clash-Berg

ASTM D1043

Temperature Retraction

ASTM D1329

Volume Change in Fluids

ASTM D471

Note: Test temperature is 24 °C (75 °F), except where specified otherwise.

For more information, visit Viton.com
The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

© 2019 The Chemours Company FC, LLC. Viton™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Replaces: VTE-H68134-00-G0710
C-11021 (9/19)