By fluid
Hydraulic Oil
Mineral HLP · Fire-resistant HFA / HFC / HFD
Temperature−20 / +80 °C
Max. pressure400 bar
Standards3
Material compatibility
| PPPolypropylene−20/+100 °C | PAPolyamide 6/66−40/+120 °C | NBRNitrile Rubber−40/+100 °C | PVDFPVDF (Kynar®)−40/+150 °C | MetalMetal (Al/Steel)−196/+425 °C | |
|---|---|---|---|---|---|
| Hydraulic oil — mineral (HLP)ISO VG 46/68, DIN 51524-2 | B | A | A | A | A |
| Water-based hydraulic fluid — HFA / HFCoil-in-water emulsion, water glycol | A | B | A | A | B |
| Phosphate ester hydraulic fluid — HFDfire-resistant synthetic, e.g. Skydrol® | C | C | D | A | A |
| ⚠ NBR is categorically incompatible with HFD phosphate ester fluids — a well-known industry failure mode. Use PVDF or metal inserts only. | |||||
A — ExcellentB — GoodC — LimitedD — Not recommended
Full compatibility matrix Fluid variants
Mineral HLP
ISO VG 32 / 46 / 68, DIN 51524-2
Standard industrial hydraulic oil
HFA-E / HFC
Oil-in-water emulsion; water glycol
Fire-resistant, water-based
HFD phosphate ester
Synthetic, e.g. Skydrol® / Fyrquel®
NBR incompatible — use PVDF or metal
Applicable standards
ISO 4413Safety requirements for hydraulic fluid power systemsDIN 51524Hydraulic fluids — minimum technical requirementsEN ISO 4413Hydraulic fluid power — general rules and safety