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Chemical Compatibility

Phosphoric Acid, Concentrated Compatibility with O-Ring Materials

See how Nitrile, Viton (FKM), EPDM, FFKM, silicone and other seal materials rate against Phosphoric Acid, Concentrated, 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, ElastosilD
FluorosiliconeFVMQFluorosilicone LS, Silastic FSRC
Neoprene (Chloroprene)CRNeoprene, BayprenC
Natural RubberNRNR, Isoprene (IR)X
Styrene ButadieneSBRBuna-S, GR-SB
ButylIIRButyl, Exxon ButylA
PolyurethaneAUAdiprene, VibrathaneD
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 Phosphoric Acid, Concentrated

The table above rates every common O-ring elastomer for service in Phosphoric Acid, Concentrated 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 Phosphoric Acid, Concentrated, the strongest candidates are Fluorocarbon (Viton), Perfluoroelastomer, Ethylene Propylene, 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.