QUINTOLUBRIC® 855 (HFDu Fire Resistant Hydraulic Fluid)


QUINTOLUBRIC® 855 does not contain water, mineral oil, or phosphate ester, and is based on high-quality, synthetic, organic esters and carefully selected additives to achieve excellent hydraulic fluid performance.

This product offers the lubrication level of premium, anti-wear hydraulic oils, and can be used with hydraulic components from all major manufacturers.

Key Benefits

  • Improved security against fire
  • Factory Mutual Approved
  • Excellent lubrication properties and shear stability
  • Non toxic and non-irritating
  • Readily bio-degradable


Property Typical ValueUnit
Appearance/ColourYellow to amber fluid [ – ]
Viscosity Index (ASTM D2270)220
Density at 15ºC (ASTM D1298)0.92g/cm³
Acid Number (ASTM D974)0.95mg KOH/g
Kinematic Viscosity
(ASTM D445)
at 20ºC
at 40ºC
at 100ºC

mm²/s or cSt
Pour Point (ASTM D97)-21 (-6)°C (°F)
Foam Test at 25°C (ASTM D892)
Sequence 1
Corrosion Protection
ISO 4404-2
ASTM D665A/D130

Flash Point (ASTM D92)310 (590)°C (°F)
Fire Point (ASTM D92)355 (675)°C (°F)
Air Release (ASTM D3427)8min.
Vane Pump Test (ASTM D2882)<5mg wear
Gear Lubrication (DIN 51354-2)>12FZG load stage
Demulsibility (ASTM D1401)41-39-0 (25)ml-ml-ml (min.)
Auto Ignition Temperature (DIN 51794)>400 (>752)°C (°F)
Dry TOST (ASTM D943 mod.)200hrs

Health, Safety and Handling

Please consult the Safety Data Sheet (SDS) for information on storage, safe handling and disposal. The conditions or methods of handling, storage, use and disposal of the product are beyond our reasonable control – we assume no liability for any ineffectiveness of the product or any injury or damage, arising out of or in connection with these conditions. This product has a shelf life of 12 months, and it should be stored in a tightly sealed container in temperatures between 0 – 40°C.


QUINTOLUBRIC® 855 was designed to replace anti-wear, mineral oil-based hydraulic fluids as well as vegetable based fluids and polyol esters. QUINTOLUBRIC® 855 can be used in or near fire hazards and in environmentally sensitive hydraulic applications without compromising the overall hydraulic system operation.

Recommendation for Use

QUINTOLUBRIC® 855 is recommended for use in systems with a maximum operating temperature of 70°C (150ºF), in combination with partial refreshment by system leakage.
QUINTOLUBRIC® 855 is used as received and pre-filtration is not necessary because the fluid is filtered during production. Its higher viscosity index compared with mineral oil makes it ideal for use at a wider temperature range. QUINTOLUBRIC® 855 also has good cold start-up properties and offers a higher viscosity at increased temperatures.

Engineering Data

Property (Test Method)Typical ValueUnit
Specific Heat at 20ºC (D 2766)2.06
kJ/kg ºC
Btu/lb ºF
Bulk Modulus at 20ºC
At 3,000 psi


Thermal Conductivity at 19ºC (D2717)0.167J/sec/
*country specific SDS are available

Fluid Maintenance

In order to lengthen fluid life, the product should be kept free from water and dirt. High temperatures should also be avoided. We recommend a program of regular fluid analysis (no less than twice per year).



QUINTOLUBRIC® 855 is compatible with iron and steel alloys and most non-ferrous metals and their alloys. It is not compatible with lead, cadmium and has limited compatibility with alloys containing high levels of these metals. QUINTOLUBRIC® 855 has limited compatibility with hot dipped or electro galvanised surfaces and good compatibility with zinc containing alloys. Suitable substitutes for these materials are available and should be used.

Paints and Coatings

QUINTOLUBRIC® 855 is compatible with multicomponent epoxy coatings. It shows limited compatibility with one component (zinc-dust containing) coatings. Specific coating and application recommendations can be acquired from coating manufacturers or directly from Quaker Houghton.


QUINTOLUBRIC® 855 is compatible and miscible with nearly all mineral oil, phosphate esters and polyolester-type hydraulic fluids. It is not miscible or compatible with water-containing fluids. For conversion recommendations, please contact Quaker Houghton.


ISO 1629Description S*MD*D*
NBRMedium to high nitrile rubber
(Buna N,>25% acrylonitrile)
FPMFluoroelastomer (Viton®)CCC
IIRButyl rubberSNN
EPDMEthylene propylene rubberNNN

**(S- Static, MD- Mild Dynamic, D- Dynamic)
C = Compatible
S = Satisfactory for short term use, but replacement with a completely
compatible elastomer is recommended at the earliest convenience.
N = Not Compatible

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