Chemical Compatibility
Automotive Brake Fluid vs 13 elastomers
Best choices for Automotive Brake Fluid: FFKM, EPDM, NR, SBR, FEPM. Full ratings below, A is continuous-service suitable, D is not recommended.
Automotive Brake Fluid
FFKM, EPDM, NRBest choices
FKM, FVMQ, AUAvoid
| Elastomer | Rating | Meaning |
|---|---|---|
| NBR Nitrile (Buna-N) | C | Conditional, test first |
| HNBR Hydrogenated Nitrile | C | Conditional, test first |
| FKM Fluorocarbon (Viton) | D | Not recommended |
| FFKM Perfluoroelastomer | A | Excellent, continuous service |
| EPDM Ethylene Propylene | A | Excellent, continuous service |
| VMQ Silicone | C | Conditional, test first |
| FVMQ Fluorosilicone | D | Not recommended |
| CR Neoprene (Chloroprene) | B | Good, minor effect |
| NR Natural Rubber | A | Excellent, continuous service |
| SBR Styrene Butadiene | A | Excellent, continuous service |
| IIR Butyl | B | Good, minor effect |
| AU Polyurethane | D | Not recommended |
| FEPM Aflas (TFE/P) | A | Excellent, continuous service |
Room-temperature, neat chemical unless stated. Concentration and temperature shift ratings, validate with our lab.
Ratings are for the neat chemical at room temperature unless stated; concentration and temperature change everything. Validate with our lab before committing a compound. Search another chemical → More chemicals starting with A →
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