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Chemical Compatibility

Brake Fluid, Wagner 21b Compatibility with O-Ring Materials

See how Nitrile, Viton (FKM), EPDM, FFKM, silicone and other seal materials rate against Brake Fluid, Wagner 21b, 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, FluorelD
PerfluoroelastomerFFKMKalrez, ChemrazD
Ethylene PropyleneEPDMNordel, VistalonA
SiliconeVMQSilastic, ElastosilC
FluorosiliconeFVMQFluorosilicone LS, Silastic FSRD
Neoprene (Chloroprene)CRNeoprene, BayprenB
Natural RubberNRNR, Isoprene (IR)B
Styrene ButadieneSBRBuna-S, GR-SA
ButylIIRButyl, Exxon ButylB
PolyurethaneAUAdiprene, VibrathaneD
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 Brake Fluid, Wagner 21b

The table above rates every common O-ring elastomer for service in Brake Fluid, Wagner 21b 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 Brake Fluid, Wagner 21b, the strongest candidates are Ethylene Propylene, Neoprene (Chloroprene), Natural Rubber, Styrene Butadiene, Butyl, 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.