Material & selection guide
Choose the compound by temperature, medium and cost — then confirm the exact grade for your application.
NBR · FKM · EPDM · VMQ
Translated from your existing Chinese material chart. These are general performance ranges, not a batch test certificate.
| Property | NBR 丁腈橡胶 | FKM 氟橡胶 | EPDM 三元乙丙橡胶 | VMQ 硅橡胶 |
|---|---|---|---|---|
| Temperature range | -30°C ~ +120°C | -20°C ~ +250°C | -50°C ~ +150°C | -60°C ~ +230°C |
| Hardness (Shore A) | 40–90 Shore A | 55–90 Shore A | 40–90 Shore A | 20–80 Shore A |
| Oil resistance | Excellent — mineral oil, lubricants | Excellent — all oil types | Poor — avoid mineral oil | Fair — avoid polar oils |
| Chemical resistance | Fair | Excellent — strong acids & solvents | Good — polar solvents, acids | Fair |
| Ozone / weathering | Poor (needs antiozonant) | Excellent | Excellent | Excellent |
| Relative cost | Low | High (8–15× NBR) | Low–medium | Medium |
| Typical applications | Hydraulic seals, oil seals, fuel-system O-rings | High-temp oil seals, chemical valves, aerospace seals | Water systems, brake fluid, outdoor weathering | Food-grade, medical, high-temp insulation |
Typical industry values for guidance only. Confirm the compound and test requirements for your application before ordering.
NBR · black nitrile
Standard compound for mineral oil and grease. Lowest cost.
FKM · fluoroelastomer
Separate size list for high temperature, fuels and aggressive media.
VMQ · silicone
Made to order in the NBR size system. Wide temperature range, not for high-pressure oil duty.
Narrow it down in three steps
Start with the medium
Mineral oil / fuel → NBR or FKM. Water, steam, brake fluid → EPDM. Avoid EPDM with mineral oil; avoid NBR with strong polar solvents.
Check the temperature
Continuous temperature plus peaks. FKM and VMQ cover the widest high-temperature range; EPDM is the choice for low-temperature water systems.
Confirm hardness & standard
Shore A hardness affects extrusion resistance and sealing force. Specify the standard (ISO 3601 / AS568, DIN 3760 / ISO 6194) and tolerance up front.
Material questions
Which materials do you offer?
NBR, FKM, EPDM, VMQ, HNBR, PU and copper are commonly available. See the Materials page for temperature, hardness and media compatibility, then tell us the working conditions.
Which standards do the seals follow?
Rotary shaft seals are commonly specified to DIN 3760 / ISO 6194 and O-rings to ISO 3601 / AS568. Confirm the exact standard and tolerance you need when enquiring.
Can I get samples or a test report?
Ask on WhatsApp with the model and quantity. Sample policy, available certificates and third-party test reports will be confirmed per order.
Can you make custom or non-standard sizes?
Yes. Send a drawing, a sample, or the d × D × W dimensions plus the working medium and temperature. We will confirm tooling, sampling and MOQ on WhatsApp.
Send us your working conditions
Medium, temperature, pressure, shaft speed and size — we will recommend a compound and profile on WhatsApp.