Fire Resistant Hydraulic Fluids ISO 46 & 68 have been purposefully designed to serve as substitutes for anti-wear, mineral oil-based hydraulic fluids, especially in scenarios where fire hazards are a concern. These fluids are versatile enough to be applied in environmentally sensitive hydraulic systems without compromising their overall operational efficiency.

What sets Fire Resistant Hydraulic Fluids ISO 46 & 68 apart is their composition, which excludes water, mineral oil, or phosphate ester. Instead, they rely on top-notch synthetic organic esters and meticulously selected additives to deliver outstanding hydraulic fluid performance. In fact, they provide lubrication on par with premium anti-wear hydraulic oils and are compatible with hydraulic components from all major manufacturers.


  • Fire-resistant
    • Features a high ignition temperature and minimal heat release.
    • Possesses properties that effectively contain and limit the spread of fire.
    • Exhibits exceptional shear stability.
    • Is non-toxic, posing no harm to aquatic life.
    • Complies with Factory Mutual requirements.
    • Is non-irritating, ensuring safety during use.
    • Is fully biodegradable, contributing to environmental sustainability.
    • Offers straightforward waste treatment options.


Metals: Fire Resistant Hydraulic Fluids ISO 46 & 68 are compatible with iron and steel alloys and most nonferrous metals and their alloys. They are not compatible with lead, cadmium, zinc, and alloys containing high levels of these metals. Suitable substitutes for these materials are available and should be used.

Paints and Coatings: Fire Resistant Hydraulic Fluids ISO 46 & 68 are compatible with multi- component epoxy coatings. They are not compatible with zinc-based coatings. Specific coating and application recommendations can be obtained from coating manufacturers or directly from your Vesta representative.

Fluids: Fire Resistant Hydraulic Fluids ISO 46 & 68 are compatible and miscible with nearly all mineral oil and polyol ester type hydraulic fluids and with some, but not all, phosphate esters. They are not miscible or compatible with water-containing fluids. For conversion recommendations, please contact your Vesta representative.

Vesta suggests that the equipment manufacturers’ recommendations for viscosity grade, performance requirements and general operating conditions should be checked prior to use.

The following chart contains recommendations regarding the use of Fire Resistant Hydraulic Fluids ISO 46 & 68 with commonly used elastomers. The elastomer applications listed are: “Static” which refers to trapped nonmoving seals such as O-rings in valve sub-plates and rigid, low pressure hose connections; “Mild-Dynamic” whose applications include accumulator bladders and hose linings where the hoses are exposed to high pressure and light flexing; and “Dynamic” which refers to cylinder rod seals, pump shaft seals and constantly flexing hydraulic hose.

NBRMedium to high nitrile rubberCCC
  FPM(Buna N, >30% acrylonitrile) Fluoroelastomer (Viton®)  C  C  C
IIRButyl rubberSNN
EPDMEthylene propylene rubberNNN

C = Compatible

S = Satisfactory for short term use, but replacement with a completely compatible elastomer is recommended at the earliest convenience.

N = Not Compatible


If the following criteria are adhered to, Fire Resistant Hydraulic Fluids ISO 46 & 68 can be stored for at least six months.

Maximum recommended long-term storage temperature:           40°C Minimum recommended long-term storage temperature:            0°C Keep drums/containers tightly closed when not in use.

Store containers/drums in a dry and well ventilated area.


Property                                      ASTM Method                       Typical Results

ISO Viscosity                                                                   46                                            68

Code VI5- 29242925
AppearanceVisualß— Yellow to amber fluid–à
Kinematic Viscosity (cSt) –D-445 
@ 0°C 320 cSt554 cSt
@ 20°C 109 cSt135 cSt
@ 40°C 47.5 cSt68 cSt
@ 100°C 9.5 cSt12.5 cSt
Viscosity IndexD-2270190185
Density at 15°CD-12980.92 g/cm30.92 g/cm3
Acid NumberD-9742.0 mg KOH/g2.0 mg KOH/g
Pour PointD-97< -30°C< -30°C
Foam Test at 25°CD-892Sequence I:Sequence I:
  50-0 ml-ml50-0 ml-ml
Corrosion ProtectionISO 4404-2PassPass
Dry TOSTD-943 mod.800 hours800 hours
Flash PointD-92300°C304°C
Fire PointD-92360°C360°C
Air ReleaseD-34277 min7 min
Pump TestD-2882<5 mg wear<5 mg wear
Gear LubricationDIN 51354-2>12 FZG –>12 FZG –
  load stageload stage
Water SeparabilityD-140141-39-0 (30) –42-38-0 (30) –
  ml-ml-ml (min.)ml-ml-ml (min.)
Specific Heat at 20°CD-27662.06 kJ/kg °C2.06 kJ/kg °C
Coefficient of Thermal Expansion at 20°C  D-1903  6 X 10-4 per °C  6 X 10-4 per °C
Vapor Pressure at 20°CASTM 02551  3.2 X 10-6 mmHg  3.2 X 10-6 mmHg
at 66°C 7.5 X10-6 mm Hg7.5 X10-6 mm Hg
Bulk Modulus at 20°C at 210 bar   1.87 X 105 N/cm2  1.87 X 105 N/cm2
at 3,000 psi 266,900 psi266,900 psi
Thermal Conductivity at 19°CD-27170.167 J/sec/m/°C0.167 J/sec/m/°C
Dielectric Breakdown VoltageD-87730 kV30 kV
Hot Manifold Ignition Temperature  ISO-20823  >450oC  >450oC
Auto Ignition TemperatureDIN 51794>400oC>400oC
OECD-301 c86.5%80.4%
 biodegradable afterbiodegradable after
 28 days28 days

Available in:         200 Litres and 20 Litres

Item Code:        VI5-2924 (46), VI5-2925 (68)

Product Informations

Product Data Sheet

Material Safety Data Sheet