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Chemical Compatibility

Exhaust Gases, Containing Sulphuric Acid Compatibility with O-Ring Materials

See how Nitrile, Viton (FKM), EPDM, FFKM, silicone and other seal materials rate against Exhaust Gases, Containing Sulphuric Acid, with an A–D chemical resistance scale.

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MaterialCodeTrade NamesRating
Nitrile (Buna-N)NBRBuna-N, HycarD
Hydrogenated NitrileHNBRTherban, ZetpolD
Fluorocarbon (Viton)FKMViton, FluorelA
PerfluoroelastomerFFKMKalrez, ChemrazA
Ethylene PropyleneEPDMNordel, VistalonA
SiliconeVMQSilastic, ElastosilX
FluorosiliconeFVMQFluorosilicone LS, Silastic FSRX
Neoprene (Chloroprene)CRNeoprene, BayprenB
Natural RubberNRNR, Isoprene (IR)B
Styrene ButadieneSBRBuna-S, GR-SB
ButylIIRButyl, Exxon ButylA
PolyurethaneAUAdiprene, VibrathaneX
Aflas (TFE/P)FEPMAflas, FEPMX
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 Exhaust Gases, Containing Sulphuric Acid

The table above rates every common O-ring elastomer for service in Exhaust Gases, Containing Sulphuric Acid 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 Exhaust Gases, Containing Sulphuric Acid, the strongest candidates are Fluorocarbon (Viton), Perfluoroelastomer, Ethylene Propylene, Neoprene (Chloroprene), Natural Rubber, Styrene Butadiene, Butyl. 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.