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 PU AU Polyester PU
Mineral oils (ISO 6743-4 classification ) ≤60 °C ≤100°C ≤60 °C ≤100°C
HH, HL, HM, HR, HV, HG, HS E E E E
Mineral greases ≤60 °C ≤100°C ≤60 °C ≤100°C
Mineral greases E E E G
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification ) ≤40 °C ≤60 °C ≤40 °C ≤60 °C
Water E G E G
HFA (oil in water emilsion (usually >80% water content) ) G G E G
HFB ( water in oil emulsion (usually >40% water) ) G G E G
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) L NS E L
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification ) ≤60 °C ≤100°C ≤60 °C ≤100°C
HFD-R (Synthetic phosphate esters ) NS NS NS NS
HFD-U (Synthetic anhydrous liquids, other than phosphate ester) L NS NS NS
Biodegradable hydraulic fluids (ISO 6743-4 classification ) ≤60 °C ≤100°C ≤60 °C ≤100°C
HETG (Triglycerides) E E E E
HEES (Synthetic Ester Base ) E E E E
HEPG (Polyalkyleneglycol Base ) NS NS E L
HEPR (Other Base Liquid – primarily Polyalphaolefins ) NS NS E E
Materials NBR H-NBR EPDM FPM MVQ
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, HS E E E E NS NS E E NS NS
Mineral greases ≤60 °C ≤100°C ≤60 °C ≤130°C ≤60 °C ≤130°C ≤60 °C ≤100°C ≤60 °C ≤100°C
Mineral greases E E E E NS NS E E NS NS
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
Water E E E E E E E E E E
HFA (oil in water emilsion (usually >80% water content) ) E E E E NS NS E F NS NS
HFB ( water in oil emulsion (usually >40% water) ) E E E E NS NS E E NS NS
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) E E E E G NS G F NS NS
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 ) NS NS NS NS G NS L L NS NS
HFD-U (Synthetic anhydrous liquids, other than phosphate ester) G L NS NS NS NS E E NS NS
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) G G E G NS NS E E NS NS
HEES (Synthetic Ester Base ) G G E G NS NS E E NS NS
HEPG (Polyalkyleneglycol Base ) E G E G G NS L NS NS NS
HEPR (Other Base Liquid – primarily Polyalphaolefins ) G G E G NS NS E E NS NS
Materials POM PA PTFE PEEK
Mineral oils (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HH, HL, HM, HR, HV, HG, HS E E E E
Mineral greases ≤90°C ≤100°C ≤100°C ≤100°C
Mineral greases E E E E
Fire restistant hydraulic fluids , Water based fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
Water E L E E
HFA (oil in water emilsion (usually >80% water content) ) E L E E
HFB ( water in oil emulsion (usually >40% water) ) E L E E
HFC (Glycol solutions, polyalkylene glycol solutions or water glycols (usually >35% water content) E L E E
Fire restistant hydraulic fluids, Water free fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HFD-R (Synthetic phosphate esters ) NS E E E
HFD-U (Synthetic anhydrous liquids, other than phosphate ester) E E E E
Biodegradable hydraulic fluids (ISO 6743-4 classification ) ≤90°C ≤100°C ≤100°C ≤100°C
HETG (Triglycerides) E E E E
HEES (Synthetic Ester Base ) E E E E
HEPG (Polyalkyleneglycol Base ) E E E E
HEPR (Other Base Liquid – primarily Polyalphaolefins ) E E E E
Materials Polyester Resin
Mineral oils (ISO 6743-4 classification ) ≤100°C
HH, HL, HM, HR, HV, HG, HS E
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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