Elastomers
NBR
Nitrile rubber
A general-purpose elastomer resistant to mineral oil, grease and fuels; the most widely used seal material in industry. Not resistant to ozone and weathering.
- HARDNESS
- Shore A 50–90
- LOW-TEMPERATURE FLEXIBILITY °C
- −34 … −57
- TEMPERATURE
- −30 … +100 °C
- COST
Chemical compatibility
Mechanical properties
| TYPE | Heat resistance °C | Low-temperature flexibility °C | Typical hardness |
|---|---|---|---|
| General-purpose compound | 100 (short life at 121 °C) | −34 … −57 (depending on compound) | Shore A 50–90 |
Service temperature
−30 °C+100 °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
- Very good resistance to mineral oil and fuels
- Good mechanical properties and wear resistance
- Economical
Weaknesses
- Not resistant to ozone, UV and weathering
- Swells in ketones, esters and chlorinated solvents
- Service life shortens above 100 °C
Manufacturing and use
- ECONOMY
- Low.
- MANUFACTURING METHODS
- Moulding (compression, injection) · Vulcanization
- TYPICAL VALVE PARTS
- O-ring · Seal · Disc coating
Used in 16 Emsal products
- 001Wafer check valveSeal
- 005Short pattern swing check valveSeal
- 007Threaded swing check valveSeal
- 011Foot valveSeal
- 030Flanged Y-strainerSeal
- 033Flanged T-strainerSeal
- 080Wafer ball valveO-ring
- 084Threaded high-pressure ball valveWasher
- 086Threaded mini ball valveO-ring
- 110Wafer butterfly valveSeal · O-ring
- 111Lug butterfly valveSeal · O-ring
- 130Flanged gate valveGate coating · O-ring
- 131Knife gate valveSeal
- 150Threaded angle seat piston valvePiston O-ring
- 311Rubber expansion jointBellows · Seal
- 312Double sphere rubber expansion jointBellows
Source: ASTM D2000 (BF, BG…). Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.