Industrial Gear Oils

Castrol Alphasyn HTX 320


Castrol Alphasyn HTX 320 High Temperature Synthetic Gear Lubricant


Castrol Alphasyn HTX 320 gear oil is a synthetic lubricant based on polyalpha-olefin (PAO) fluids and sulphur/ phosphorus anti-wear additive technology. This lubricant oil is designed to offer outstanding thermal stability along with a good load-carrying capacity.


The Alphasyn HTX range has been formulated for use in most types of light to medium-duty enclosed gear systems but should not be used for heavy / shock-loaded systems. Alphasyn HTX is also suitable for bearings and circulatory systems operating at high temperatures. The outstanding oxidation and thermal stability of Alphasyn HTX allows oil change intervals to be extended in circumstances where extreme temperatures would result in a short service life if using conventional mineral oil-based lubricants. This allows demonstrable savings to be made by reducing the level of maintenance required. All products in the Alphasyn HTX range have very low pour points and excellent viscosity/temperature
characteristics, allowing their use in low-temperature as well as high-temperature applications.

Castrol Alphasyn HTX 320 is fully compatible with nitrile, silicone and fluoropolymer seal materials.

Alphasyn HTX is classified as follows:
DIN Classification is CLP

Alphasyn HTX grades meet the requirements of:
DIN 51517 Part 3
David Brown Type A


Castrol Alphasyn HTX 320 Oil Advantages:

  • Good thermal and oxidative stability provides reliable operation and extended operating life when compared to mineral oil-based products.
  • An inherently high viscosity index makes the product suitable for operations operating over a wide temperature range.
  • Good antiwear and load-carrying abilities including FZG > 12 rating under A16.6/110 test conditions eliminate wear and prolongs gear tooth life.
  • Good water separation and demulsification characteristics mean reduced downtime through prolonged lubricant life and increased equipment reliability.
  • PAO-based lubricant provides good compatibility with seals, paints and mineral oil-based lubricants.
Operating temperatureMax. 93°C
Viscosity320 mm/s² at 40°C
Viscosity index140
Oil typePAO
Product typeLubricating Oils
Applicable to these sectorsAerospace, Automotive Manufacture, Cement, Chemicals, Machinery, Metals, Mining, Power Generation, Pulp & Paper
Castrol Alphasyn HTX320 synthetic transmission oil

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