Elastomers
FKM
Fluorocarbon rubber
An elastomer resistant to high temperature, oil, fuel, aromatic hydrocarbons and many chemicals. A high-performance seal for chemical and petrochemical valves.
- HARDNESS
- Shore A 60–90
- LOW-TEMPERATURE FLEXIBILITY °C
- −26
- TEMPERATURE
- −20 … +200 °C
- COST
Chemical compatibility
Mechanical properties
| TYPE | Heat resistance °C | Low-temperature flexibility °C | Typical hardness |
|---|---|---|---|
| General-purpose compound | 204 (higher with shorter life) | −26 (some compounds −46) | Shore A 60–90 |
Service temperature
−20 °C+200 °C−200−1000100200300400500600700800
Media suitability GENERAL TREND
Water
Steam
Mineral oil
Fuel, aliphatic HC
Ozone, outdoor
Dilute acid
Caustic
Ketones, esters
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- High-temperature resistance
- Resistant to oil, fuel, aromatic and chlorinated hydrocarbons
- Very low gas permeability
Weaknesses
- Swells in ketones, low-molecular-weight esters and amines
- Limited in hot water and steam
- Poor low-temperature flexibility
Manufacturing and use
- ECONOMY
- High.
- MANUFACTURING METHODS
- Moulding (compression, injection) · Vulcanization
- TYPICAL VALVE PARTS
- O-ring · Seal · Packing
Used in 16 Emsal products
- 001Wafer check valveSeal
- 005Short pattern swing check valveSeal
- 030Flanged Y-strainerSeal
- 033Flanged T-strainerSeal
- 078Threaded 2-piece ball valveO-ring
- 079Threaded 3-piece ball valveO-ring
- 081Monoblock ball valveO-ring
- 086Threaded mini ball valveO-ring
- 110Wafer butterfly valveSeal
- 111Lug butterfly valveSeal
- 150Threaded angle seat piston valveSeal
- 190Threaded pressure reducing valveSeal
- 191Flanged pressure reducing valveSeal
- 192Adjustable pressure reducing valveSeal
- 251Angle safety valve with leverSeal
- 252Angle safety valveBonnet gasket · Seal
Source: ASTM D1418 · D2000 (HK). Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.