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Chemical Compatibility

Natural Gas Compatibility with O-Ring Materials

See how Nitrile, Viton (FKM), EPDM, FFKM, silicone and other seal materials rate against Natural Gas, with an A–D chemical resistance scale.

Back to Chemical Compatibility Checker
MaterialCodeTrade NamesRating
Nitrile (Buna-N)NBRBuna-N, HycarA
Hydrogenated NitrileHNBRTherban, ZetpolA
Fluorocarbon (Viton)FKMViton, FluorelA
PerfluoroelastomerFFKMKalrez, ChemrazA
Ethylene PropyleneEPDMNordel, VistalonD
SiliconeVMQSilastic, ElastosilB
FluorosiliconeFVMQFluorosilicone LS, Silastic FSRC
Neoprene (Chloroprene)CRNeoprene, BayprenA
Natural RubberNRNR, Isoprene (IR)D
Styrene ButadieneSBRBuna-S, GR-SC
ButylIIRButyl, Exxon ButylD
PolyurethaneAUAdiprene, VibrathaneB
Aflas (TFE/P)FEPMAflas, FEPMA
ABCDX

Guideline only. Values and ratings are representative at ambient conditions and are not a warranty of performance. Actual results vary with temperature, pressure, concentration and exposure time. Validate for your specific application — our engineers can help.

Choosing a seal material for Natural Gas

The table above rates every common O-ring elastomer for service in Natural Gas on an A–D scale. A is Excellent, B is Good, C is Fair (test before relying on it), and D is Not Recommended. An X indicates insufficient published data.

For Natural Gas, the strongest candidates are Nitrile (Buna-N), Hydrogenated Nitrile, Fluorocarbon (Viton), Perfluoroelastomer, Silicone, Neoprene (Chloroprene), Polyurethane, Aflas (TFE/P). These ratings are representative at ambient conditions (~20°C). Compatibility shifts with temperature, concentration, pressure and exposure time, so always validate the material against your real operating envelope before committing to a design.