Fluid Compatibility

Below Table shows the compatibility rating of the most commonly used seal materials groups with the fluid groups and materials, classified according to international standard ISO 6743-4.

Important comments:
1. Actual testing should be considered to determine the compatibility of the material in the fluid and application. Result may vary significantly due to other operating conditions, including but not limited to temperature, concentration, mixtures, etc.
2. In case of filled PTFE compounds, compatibility of filler must be considered separately.

Legend:
E Excellent – No chemical effect
G Good – Minor chemical effect
L Limted – Moderate effect
NS Not Suggested – Severe effect

Materials EU Polyether PUAU Polyester PU
Mineral oils (ISO 6743-4 classification )≤60 °C≤100°C≤60 °C≤100°C
HH, HL, HM, HR, HV, HG, HSEEEE
Mineral greases ≤60 °C≤100°C≤60 °C≤100°C
Mineral greases EEEG
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification )≤40 °C≤60 °C≤40 °C≤60 °C
Water EGEG
HFA (oil in water emilsion (usually >80% water content) ) GGEG
HFB ( water in oil emulsion (usually >40% water) )GGEG
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) LNSEL
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification )≤60 °C≤100°C≤60 °C≤100°C
HFD-R (Synthetic phosphate esters )NSNSNSNS
HFD-U (Synthetic anhydrous liquids, other than phosphate ester)LNSNSNS
Biodegradable hydraulic fluids (ISO 6743-4 classification ) ≤60 °C≤100°C≤60 °C≤100°C
HETG (Triglycerides) EEEE
HEES (Synthetic Ester Base ) EEEE
HEPG (Polyalkyleneglycol Base ) NSNSEL
HEPR (Other Base Liquid – primarily Polyalphaolefins ) NSNSEE
MaterialsNBRH-NBREPDMFPMMVQ
Mineral oils (ISO 6743-4 classification )≤60 °C≤100°C≤60 °C≤130°C≤60 °C≤130°C≤60 °C≤100°C≤60 °C≤100°C
HH, HL, HM, HR, HV, HG, HSEEEENSNSEENSNS
Mineral greases≤60 °C≤100°C≤60 °C≤130°C≤60 °C≤130°C≤60 °C≤100°C≤60 °C≤100°C
Mineral greasesEEEENSNSEENSNS
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification )≤40 °C≤60 °C≤60 °C≤130°C≤60 °C≤130°C≤40 °C≤60 °C≤60 °C≤100°C
WaterEEEEEEEEEE
HFA (oil in water emilsion (usually >80% water content) )EEEENSNSEFNSNS
HFB ( water in oil emulsion (usually >40% water) )EEEENSNSEENSNS
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content)EEEEGNSGFNSNS
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification )≤60 °C≤100°C≤60 °C≤130°C≤60 °C≤130°C≤60 °C≤100°C≤60 °C≤100°C
HFD-R (Synthetic phosphate esters )NSNSNSNSGNSLLNSNS
HFD-U (Synthetic anhydrous liquids, other than phosphate ester)GLNSNSNSNSEENSNS
Biodegradable hydraulic fluids (ISO 6743-4 classification )≤60 °C≤100°C≤60 °C≤130°C≤60 °C≤130°C≤60 °C≤100°C≤60 °C≤100°C
HETG (Triglycerides)GGEGNSNSEENSNS
HEES (Synthetic Ester Base )GGEGNSNSEENSNS
HEPG (Polyalkyleneglycol Base )EGEGGNSLNSNSNS
HEPR (Other Base Liquid – primarily Polyalphaolefins )GGEGNSNSEENSNS
MaterialsPOMPAPTFEPEEK
Mineral oils (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HH, HL, HM, HR, HV, HG, HSEEEE
Mineral greases ≤90°C ≤100°C ≤100°C ≤100°C
Mineral greases EEEE
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
Water ELEE
HFA (oil in water emilsion (usually >80% water content) ) ELEE
HFB ( water in oil emulsion (usually >40% water) )ELEE
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) ELEE
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HFD-R (Synthetic phosphate esters )NSEEE
HFD-U (Synthetic anhydrous liquids, other than phosphate ester)EEEE
Biodegradable hydraulic fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HETG (Triglycerides) EEEE
HEES (Synthetic Ester Base ) EEEE
HEPG (Polyalkyleneglycol Base ) EEEE
HEPR (Other Base Liquid – primarily Polyalphaolefins ) EEEE
Materials Polyester Resin
Mineral oils (ISO 6743-4 classification ) ≤100°C
HH, HL, HM, HR, HV, HG, HSE
Mineral greases ≤100°C
Mineral greases E
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification ) ≤60 °C
Water E
HFA (oil in water emilsion (usually >80% water content) ) E
HFB ( water in oil emulsion (usually >40% water) )E
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) G
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification ) ≤100 °C
HFD-R (Synthetic phosphate esters )E
HFD-U (Synthetic anhydrous liquids, other than phosphate ester)E
Biodegradable hydraulic fluids (ISO 6743-4 classification ) ≤60 °C
HETG (Triglycerides) E
HEES (Synthetic Ester Base ) E
HEPG (Polyalkyleneglycol Base ) E
HEPR (Other Base Liquid – primarily Polyalphaolefins ) E
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