Diesel Fuel Resistant O-Rings
Compatibility ratings for 7 O-ring materials in Diesel Fuel service
Diesel is friendlier to NBR than gasoline — nitrile rates A alongside FKM, HNBR, PTFE and FFKM, which is why NBR dominates diesel fuel sealing. EPDM and VMQ remain D and must be avoided.
Diesel Fuel (Fuels) compatibility with the seven most common O-ring elastomers, rated on the standard A/B/C/D scale: A = excellent, B = good, C = fair, D = not recommended. This data also appears in our interactive chemical compatibility chart and is available machine-readable at /api/chemicals.json.
| Material | Rating | Guidance |
|---|---|---|
| NBR | A | excellent — recommended for continuous service |
| FKM | A | excellent — recommended for continuous service |
| EPDM | D | not recommended — rapid degradation expected |
| VMQ | D | not recommended — rapid degradation expected |
| PTFE | A | excellent — recommended for continuous service |
| FFKM | A | excellent — recommended for continuous service |
| HNBR | A | excellent — recommended for continuous service |
Why These Ratings
- NBR (A) — documented strengths include “Gasoline and diesel fuels.”
- FKM (A) — documented strengths include “Gasoline and diesel fuels.”
- EPDM (D) — documented weaknesses include “Hydrocarbon fuels.”
- VMQ (D) — documented weaknesses include “Aromatic hydrocarbons.”
- PTFE (A) — documented strengths include “Fuels and oils.”
- FFKM (A) — documented strengths include “Fuels and oils.”
- HNBR (A) — documented strengths include “Gasoline and diesel fuels.”
FuelsService: Concentration & Temperature Notes
Aromatic content is the hidden variable in fuel service. Standard gasoline rates NBR at B in our data, but high-aromatic blends push NBR toward failure while FKM stays A. Diesel is consistently friendlier to NBR than gasoline (A versus B). Fuel plus heat is the real killer: under-hood fuel seals running continuously above +100°C belong in FKM or HNBR, not NBR.
Recommended
- NBR O-rings (A)
- FKM O-rings (A)
- PTFE O-rings (A)
- FFKM O-rings (A)
- HNBR O-rings (A)
Use With Caution
No conditional materials for this chemical.
Avoid
- EPDM (D)
- VMQ (D)
Related Chemicals (Fuels)
Frequently Asked Questions
Is Diesel Fuel compatible with FKM (Viton) O-rings?
FKM is rated A for Diesel Fuel: excellent — recommended for continuous service. Ratings are general guidelines; concentration, temperature and exposure time all affect real-world compatibility, so validate critical applications with ASTM D471 immersion testing.
Is Diesel Fuel compatible with NBR (nitrile) O-rings?
NBR is rated A for Diesel Fuel: excellent — recommended for continuous service. NBR is the lowest-cost elastomer, so when it earns an A or B rating it is usually the economical default; when it rates C or D, do not substitute it for a higher-rated material to save cost.
Can I use PTFE O-rings with Diesel Fuel?
PTFE is rated A for Diesel Fuel: excellent — recommended for continuous service. Remember that PTFE has no elastic memory — in demanding service it needs spring energization or an elastomer core (FEP/PFA encapsulation) to maintain sealing force.
What is the best O-ring material for Diesel Fuel?
NBR, FKM, PTFE, FFKM, HNBR are rated A (excellent) for Diesel Fuel in our compatibility data and are the recommended starting point for material selection. Final selection should also account for operating temperature, pressure and whether the seal is static or dynamic.
Can I use EPDM O-rings with Diesel Fuel?
EPDM is rated D for Diesel Fuel: not recommended — rapid degradation expected. Always confirm the specific fluid concentration and temperature before specifying EPDM for this service.
Need O-Rings for Diesel Fuel Service?
Send us your fluid, concentration and temperature — our engineers will confirm the right compound. MOQ 1 piece.