Fluorocarbon rubber (FKM) and Fluorosilicone rubber (FVMQ) are two common materials used in sealing applications. Here we introduce to you how to choose between FVMQ and FKM.
1. Temperature Range:
Property
FKM
FVMQ
Temperature Range
-15°C to 250°C
-60°C to 250°C
2. Chemical Resistance:
Chemical Compatibility
FKM
FVMQ
Resistance to Oil/Fuel
Excellent
Good
Resistance to Chemicals
normal
aliphatic,aromatic hydrocarbons, acetone,methanol and ethanol.
3. Mechanical Properties:
Mechanical Property
FKM
FVMQ
Tensile Strength (MPa)
10–18
6–10
Elongation at Break (%)
150–200
200–280
Compression Set (%)
Moderate (25-30%) 200°C x 72H
Good (15-20%) 150°C x 72H
4. Cost Comparison:
Material
Relative Price Level
FVMQ
200%-300% Higher than FKM
Summary
FKM is the preferred material for high-temperature and chemical environments, offering good mechanical properties and oil resistance. But FKM does not perform as effectively in low temperatures.
FVMQ has better low-temperature flexibility and chemical resistance, though it comes at a higher cost. FVMQ has slightly lower tensile strength compare to FKM.
Please contact us, OBT Rubber Seal, for better understanding your technical requirement and our proposal.
