Hydraulic Oils

Castrol Anvol WG 46


Fire resistant hydraulic fluid


Castrol Anvol WG 46 is an HF-C type water-glycol fire resistant hydraulic fluid, containing anti-wear additives and
corrosion inhibitors. It provides protection against rust and in hydraulic pump tests, Anvol WG 46 has shown high levels
of anti-wear performance during product pump testing. Its foam resistance, low temperature flow, emulsion stability and
storage stability are also excellent according to storage stability testing.


Anvol WG 46 is for use in hydraulic systems where, in the event of fluid leakage, there is a significant risk of ignition.
Examples of applications include furnace doors, die-casting machines, forging machinery and mining equipment. It can
be used in vane, gear or piston-type pumps with pressures up to 206.8 bar (3000psi)

As with any water containing fluid, continuous high temperature leads to excessive evaporation. The water content
should be checked regularly in service and any corrections made by addition of distilled or de-ionised water. Occasional
monitoring of alkalinity is recommended to ensure the correct level of corrosion inhibition.

Care should be taken to ensure the hydraulic system is designed for using water glycol based fluids. Care should also
be taken to ensure the compatibility of Anvol WG 46 with paints, seals and metals, and also ensure that the hydraulic
pumps and filters used are suitable. A thorough draining and flushing procedure should be followed when converting
from other fluids to water glycol based solutions.

Anvol WG 46 is compatible with the most commonly used nitrile, neoprene, silicone, nylon, butyl rubber and
fluoropolymer seal materials. Compatibility with specific seal materials in use should be confirmed prior to changing to
Anvol WG 46.

Anvol WG 46 meets the requirements of:
ISO 12922:2012 Category HFC as defined by ISO 6743-4:2001

  • Anti-wear performance gives wear protection to system components
  • Fire resistant as defined within ISO 12922:2012
  • Low pour point ensures consistent performance over a range of temperature between -20oC to 60oC
Operating temperature Max. 60°C
Viscosity 46 mm/s² at 40°C
Viscosity index 200
Oil type Water Glycol
Product type Lubricating Oils
Applicable to these sectors Aerospace, Automotive Manufacture, Chemicals, Machinery, Metal Goods, Metals, Power Generation

Compatibility of Anvol WG 46 with hydraulic components:
Seal materials – Suitable materials are: Nitrile PTFE, Neoprene (Chloroprene) Silicone, Viton Nylon, Natural
Rubber Butyl Rubber.
Filters – Most metal types are compatible, but some paper elements can be damaged by water and only types approved
for high water content fluids should be used.
Paints – Fire resistant water glycols soften and lift most paints. Vinyl or epoxy resin based paints are compatible. When
changing from mineral oil to water-glycol, all paint in the system should be removed unless it is known to be a
compatible type.
Fluid maintenance:
In service, water can be lost by evaporation and this must be periodically replaced to maintain the correct viscosity and
optimum fire resistance. Water content can be determined directly by Laboratory analysis. Only condensate, distilled or
de-ionised water should be used for top-up. The required quantity of water should be slowly added to the reservoir with
the system running to ensure thorough mixing.
Operating temperature range:
The operating temperature range is between -20 to +60°C. Anvol WG will remain as a fluid down to approximately -50°C.
However, increased viscosity will limit its ability to run effectively at low temperatures.. Care must be taken at
temperatures above 60°C so water evaporation does not occur too readily and reduce fire resistant properties.


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