Elastomers
EPDM
Ethylene propylene diene rubber
An elastomer highly resistant to water, steam, ozone and weathering. The standard seal for drinking water, hot water and steam valves; never used with mineral oil.
- HARDNESS
- Shore A 50–90
- LOW-TEMPERATURE FLEXIBILITY °C
- ≈ −57
- TEMPERATURE
- −50 … +150 °C
- COST
Chemical compatibility
Mechanical properties
| TYPE | Heat resistance °C | Low-temperature flexibility °C | Typical hardness |
|---|---|---|---|
| General-purpose compound | 150 (204 in water and steam) | ≈ −57 | Shore A 50–90 |
Service temperature
−50 °C+150 °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
- The best general-purpose elastomer for hot water and steam
- Highly resistant to ozone and weathering
- Economical
Weaknesses
- Deteriorates rapidly in mineral oil, grease and fuels
- Not used in hydrocarbon service
Manufacturing and use
- ECONOMY
- Low.
- MANUFACTURING METHODS
- Moulding (compression, injection) · Vulcanization
- TYPICAL VALVE PARTS
- O-ring · Butterfly valve liner · Disc coating
Used in 13 Emsal products
- 001Wafer check valveSeal
- 003Dual plate check valveSeal
- 005Short pattern swing check valveSeal
- 011Foot valveSeal
- 030Flanged Y-strainerSeal
- 033Flanged T-strainerSeal
- 110Wafer butterfly valveSeal
- 111Lug butterfly valveSeal
- 130Flanged gate valveSeal · Gate coating · O-ring · Bonnet gasket
- 131Knife gate valveSeal
- 150Threaded angle seat piston valveSeal
- 311Rubber expansion jointBellows · Seal
- 312Double sphere rubber expansion jointBellows
Source: ASTM D2000 (AA, BA, CA). Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.