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Chemical Compatibility

Potassium Stearate Compatibility with O-Ring Materials

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

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MaterialCodeTrade NamesRating
Nitrile (Buna-N)NBRBuna-N, HycarC
Hydrogenated NitrileHNBRTherban, ZetpolC
Fluorocarbon (Viton)FKMViton, FluorelB
PerfluoroelastomerFFKMKalrez, ChemrazA
Ethylene PropyleneEPDMNordel, VistalonA
SiliconeVMQSilastic, ElastosilB
FluorosiliconeFVMQFluorosilicone LS, Silastic FSRA
Neoprene (Chloroprene)CRNeoprene, BayprenA
Natural RubberNRNR, Isoprene (IR)A
Styrene ButadieneSBRBuna-S, GR-SA
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 Potassium Stearate

The table above rates every common O-ring elastomer for service in Potassium Stearate 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 Potassium Stearate, the strongest candidates are Fluorocarbon (Viton), Perfluoroelastomer, Ethylene Propylene, Silicone, Fluorosilicone, 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.