Industrial Gear Oils

Castrol Alphasyn GS 220


Castrol Alphasyn GS 220 Industrial Synthetic Gear Oil


Alphasyn GS are fully synthetic gear lubricants based on carefully selected polyglycol fluids and containing antioxidant, rust-inhibiting and EP additives of high thermal stability.


Castrol Alphasyn GS 220 has inherently superior properties relative to mineral lubricants, therefore these grades are especially suitable for the high-temperature lubrication of gears and bearings, particularly in large-scale mills and calenders.

In worm gears operating with mineral oil at low speeds and high torques, conditions of boundary lubrication tend to promote pitting and consequent rapid wear of bronze worm wheels. Fatty oils (also known as compounded oils) were found to be effective in reducing pitting but suffered from rapid oxidation at high running temperatures. Alphasyn GS grades are suitable for these applications and also allow extended drain and change intervals.

Some manufacturers employ them for fill-for-life lubricants.


Castrol Alphasyn GS 220 Oil Advantages:

  • Reduced frictional losses leads to reduced energy consumption and lower sump temperatures.
  • Higher thermal stability, hence minimal formation of sludge and deposits.
  • Better load-carrying properties and reduced wear compared with conventional mineral oils.
  • Inherently higher Viscosity Index (VI) which, with the lower pour point, results in a wider range of service temperatures (-30 °C to 150 °C continuous bulk temperatures, with intermittent operating temperatures of up to 220°C)
Operating temperatureMax. 120°C
Viscosity220 mm/s² at 40°C
Viscosity index240
Oil typePAG
Product typeLubricating Oils
Applicable to these sectorsAerospace, Automotive Manufacture, Cement, Chemicals, Machinery, Metals, Mining, Power Generation, Pulp & Paper

Normal industrial paints are not compatible with these lubricants. Gearboxes should be left unpainted internally, or alternatively should be painted with two component coatings such as epoxy resins.
Care must be taken that seal materials are compatible with the Alphasyn GS lubricants. The recommended materials are nitrile rubber (NBR), fluoro-silicone rubber (FVMQ), and vinyl-methyl-polysiloxane rubber (VMQ).

Incompatible materials are likely to shrink or swell, thus causing either severe leakage or seizure of the seal. These products are NOT miscible with mineral oils.


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Castrol Alphasyn GS 220 synthetic transmission oil

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