Chemical Composition
FKM is composed of fluorocarbon copolymers, hexafluoropropylene (HFP) and tetrafluoroethylene (TFE). Some varieties include monomers such as fluorinated vinylidene (VDF) to improve specific properties.
Key Properties
- Thermal Resistance: Withstands temperatures from -20°C to +250°C (and up to +300°C in limited exposures).
- Chemical Resistance: Excellent against oils, fuels, acids and solvents.
- Mechanical Stability: Maintains elasticity and strength under extreme conditions.
Common Applications
- Automotive: Gaskets, seals and hoses in engines.
- Aerospace: Components exposed to fuels and high temperatures.
- Chemical Industry: Tank linings and valves.
- Food and Pharmaceutical: Specific versions comply with FDA and USP regulations.
Advantages over Other Elastomers
- Surpasses NBR and EPDM in chemical and thermal resistance.
- More economical than PTFE for dynamic applications.
Limitations
- Low resistance to esters and amines.
- Higher cost than standard rubbers.
Processing
Molded by compression, injection or extrusion, requiring specialized equipment due to its high viscosity.
Regulations
Complies with standards such as ASTM D1418 (FKM designation) and ISO 1629.
Common Variants
- Type 1: High chemical resistance (VDF/HFP base).
- Type 2: Better flexibility at low temperatures (with TFE).
- Type 3: For extreme environments (with perfluorinated).
Maintenance
Avoid prolonged exposure to UV light or ozone to extend its service life.
Comparison with FKM
FKM (Perfluorocarbon) offers greater chemical resistance but at a significantly higher cost.
In summary: FKM is a premium material for demanding environments, balancing performance and durability. Its selection depends on specific requirements of temperature, chemicals and budget, Contact us.
