o-rings and seals

Problem Solving Products, Inc. Logo
Problem Solving Products, Inc.

7108 S. Alton Way, Unit I
Centennial, Colorado 80112
(303) 758-2728

(303) 758-2728

Home > FKM Fluorocarbon > Grades

Comparison of General Use and High Performance Grades of FKM Fluorocarbon

There are three major general use grades of FKM fluoroelastomer: 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 high performance FKM fluorocarbon grades: GB, GBL, GP, GLT, and GFLT.

General Use Grades:

FKM Fluorocarbon A: (vinylidene fluoride and hexafluoropropylene)

Grades of Viton

* Copyright for photograph

FKM fluorocarbon A is a family of fluoroelastomer dipolymers, that is they are polymerized from two monomers, vinylidene fluoride (VF2) and hexafluoropropylene (HFP). FKM 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 FKM fluorocarbon A grades that accomodate various manufacturing processes including transfer molding, extrusion, compression molding, and calendering.

FKM Fluorocarbon B: (vinylidene, hexafluoropropylene and tetrafluoroethylene)

FKM fluorocarbon B is a grade of fluoroelastomer terpolymers, which means that they are polymerized from three monomers, vinylidene (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). FKM B fluoroelastomers offer better fluid resistance than A type fluoroelastomers. There is a full range of FKM fluorocarbon B grades that accomodate a variety of manufacturing processes including compression molding, extrusion, and calendering.

FKM Fluorocarbon F:

FKM fluorocarbon F is a grade of fluoroelastomer terpolymers, that is they are polymerized from three monomers, vinyl fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). FKM F fluoroelastomers offer the best fluid resistance of all FKM fluorocarbon types. F types are particularly useful in applications requiring resistance to fuel permeation. There is a range of FKM fluorocarbon F grades to accomodate various manufacturing requirements.

High Performance Grade:

FKM Fluorocarbon GB, GBL:

FKM GB and GBL are grades of fluoroelastomer terpolymers, that is they are polymerized from three monomers, vinyl fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). FKM 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.

FKM Fluorocarbon GLT:

FKM GLT is a fluoroelastomer designed to retain the high heat and the chemical resistance of general use grades of FKM fluoroelastomer, 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. FKM GLT shows an 8 to 12°C lower Tg than general use FKM fluorocarbon grades. There is a range of GLT products to accommodate various processing conditions.

FKM Fluorocarbon GFLT:

FKM 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. FKM fluorocarbon GFLT shows a 6 to 10°C lower Tg than general use FKM fluorocarbon 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 FKM Fluorocarbon
  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: FKM Fluorocarbon Properties

* Photograph © Can Stock Photo Inc. | anekoho

 

 

We are located in the Denver Technological
Center in a suburb of Denver, Colorado
©1997-2017, Problem Solving Products, Inc.
Website Map | Privacy Statement | Terms of Use