Part no: 10550

Sterntube Lubricants delivering superior performance and wear protection even when water ingress occurs

These mineral based lubricants provide an excellent level of lubrication in both neat and emulsion forms. They are developed primarily for use in sterntubes. The products provide:

  • Superior level of lubrication even when water ingress occurs
  • Excellent wear protection
  • Excellent corrosion protection
  • Compatibility with metals commonly used
ISO 9001
ISO 14001

HYDROX 550 (both neat oil and emulsion including 20% water contamination) has been successfully tested by Class and their stability, lubricating and corrosion protection performance have been verified by Lloyds Register.

HYDROX 550 (ISO 68) is the viscosity grade generally recommended by the bearing and seal manufacturers for regular running in the sterntube.


DescriptionMineral oil based sterntube lubricant for regular use and lubrication of some stabiliser models.
Typical Viscosity (cSt @40°C)73
Viscosity Index100
Density (kg/ltr@15°C)0.88
Pour Point ASTM D7346 (°C)< –25
Anti corrosion SKF Water Emcor TestPasses

HYDROX 550 is compatible with the elastomers used for lip seal systems and are approved by the major lip and face stern seal manufacturers.

HYDROX 550 will absorb any sea or fresh water entering the sterntube to form a fluid emulsion. This reduces the risk of free water being present and continues to provide the required lubrication and corrosion protection. (Conventional oils do not emulsify in the same way and tend to separate, exposing components to free water and potential wear damage).

The emulsions, once formed, have excellent stability, therefore free water is not released. This ensures corrosion protection is maintained even during prolonged standing and during the critical time of start-up.

Safety Data Sheets (SDS) available to customers

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