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Comparison
of General Use and High Performance Grades of Viton™
There
are three major general use grades of Viton: A,
B and F. They differ primarily in their resistance to fluids, and in
particular aggressive lubricating oils and oxygenated fuels, such as
methanol and ethanol automotive fuel blends. There is also a class of
General
Use Grades:
Viton
A: (vinylidene fluoride and hexafluoropropylene)
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Viton
A is a family of fluoroelastomer dipolymers, that is they
are polymerized from two monomers, vinylidene fluoride (VF2)
and hexafluoropropylene (HFP). Viton A fluoroelastomers
are general purpose types that are suited for general molded
goods such as o-rings and v-rings, gaskets, and other simple
and complex shapes. There is a full range of Viton A
grades that accomodate various manufacturing processes including
transfer molding, extrusion, compression molding,
and calendering.
Viton
B: (vinylidene, hexafluoropropylene and tetrafluoroethylene)
Viton
B is a grade of fluoroelastomer terpolymers, which means that they
are polymerized from three monomers, vinylidene (VF2), hexafluoropropylene
(HFP), and tetrafluoroethylene (TFE). Viton B fluoroelastomers
offer better fluid resistance than A type fluoroelastomers.
There is a full range of Viton B grades that accomodate
a variety of manufacturing processes including compression molding, extrusion, and calendering.
Viton
F:
Viton
F is a grade of fluoroelastomer terpolymers, that is they
are polymerized from three monomers, vinyl fluoride (VF2),
hexafluoropropylene (HFP), and tetrafluoroethylene (TFE).
Viton F fluoroelastomers offer the best fluid resistance
of all Viton types. F types are particularly useful in
applications requiring resistance to fuel permeation. There
is a range of Viton F grades to accomodate various manufacturing
requirements.
High
Performance Grades:
Viton
GB, GBL:
Viton
GB and GBL are grades of fluoroelastomer terpolymers, that
is they are polymerized from three monomers, vinyl fluoride
(VF2), hexafluoropropylene (HFP), and tetrafluoroethylene
(TFE). Viton GB and GBL use peroxide cure chemistry that
result in superior resistance to steam, acid, and aggressive
engine oils. There is full range of GB and GBL types that
can accommodate most rubber processing requirements including
compression, transfer molding, extrusion, and
calendering.
Viton
GLT:
Viton
GLT is a fluoroelastomer designed to retain the high heat
and the chemical resistance of general use grades of Viton, while improving the low temperature flexibility
of the material. Glass transition temperatures (Tg) of materials
are indicative of low temperature performance in typical elastomer
applications. Viton GLT shows an 8 to 12°C lower
Tg than general use Viton grades. There is a range of
GLT products to accommodate various processing conditions.
Viton
GFLT:
Viton
GFLT is a fluoroelastomer designed to retain the high heat
and the superior chemical resistance of the GF High Performance
types, while improving the low temperature performance of
the material. Viton GFLT shows a 6 to 10°C lower
Tg than general use Viton grades. There is a range of
GFLT products to accommodate various processing conditions.
Table
Key: 1=Excellent, 2=Very Good, 3=Good, NR=Not Recommended
Relative Chemical Compatibility and Mechanical
Properties of Viton™ |
|
General
Use Grade Types |
High-Performance
Grade Types |
Chemical Environment |
A |
B |
F |
GB, GBL |
GF |
GLT |
GFLT |
Automotive and aviation fuels |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
Automotive fuels oxygenated with MEOH, ETOH,
MTBE, etc. |
NR |
2 |
1 |
2 |
1 |
NR |
1 |
Engine lubricating oil, SE and SF |
2 |
1 |
1 |
1 |
1 |
1 |
1 |
Engine lubricating oil, SG and SH |
3 |
2 |
1 |
1 |
1 |
2 |
1 |
Aliphatic hydrocarbon process fluids, chemicals |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
Aromatic hydrocarbon process fluids, chemicals |
2 |
2 |
1 |
1 |
1 |
2 |
1 |
Aqueous fluids, steam, mineral acids |
3 |
2 |
2 |
1 |
1 |
1 |
1 |
Compression
and low-temperature performance |
Resistance to compression set |
1 |
2 |
2 |
2 |
3 |
2 |
2 |
Low-temperature flexibility |
2 |
2 |
3 |
2 |
3 |
1 |
1 |
Next: Viton FKM
Properties
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Can Stock Photo Inc. | anekoho
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