Part no: 10100

The Environmentally Acceptable Sterntube Lubricant delivering superior performance and wear protection even when water ingress occurs

  • Verified lubrication at high water levels
  • Protects bearings against corrosion
  • Excellent wear protection
  • ISO 68, 100, 150 & 220

For sterntubes, stabiliser bearings and CPP hubs

VGP Compliance Statement
ISO 9001
ISO 14001

HYDROX BIO 100 (both neat oil and emulsion including 20% water contamination) has been successfully tested by Class and its stability, lubricating and corrosion protection performance have been verified by Lloyds Register.

HYDROX BIO 100 is a viscosity grade generally recommended by the bearing and seal manufacturers for regular running in the sterntube. HYDROX BIO 100 can also be used in certain stabiliser systems and CPP hubs.

This product is approved by many of the leading OEMs such as KEMEL, SKF Marine and Wärtsilä and for up to 5 years when used with OEM elastomers recommended for EALs. For specific details please contact us.


DescriptionEmulsifiable, biodegradable sterntube lubricant for regular use and lubrication of some stabiliser bearings and CPP hubs.
Typical Viscosity (cSt @40°C)100
Typical Viscosity Index187
Density (kg/ltr@15°C)0.93
Pour Point IP15 (°C)< –24
Anti-corrosion SKF Water Emcor TestPasses
VGP Compliant

Wear Scar

Emulsion Viscosity

HYDROX BIO 100 is a biodegradable lubricant based on synthetic esters, developed primarily for use in sterntubes and bearings where water ingress may occur. The product provides:

  • Superior level of lubrication even when water ingress occurs
  • Excellent wear protection
  • Excellent corrosion protection
  • Compatibility with metals commonly used
  • Biodegradable and non-toxic

HYDROX BIO 100 will absorb 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.)

HYDROX BIO lubricants achieve a biodegradability of greater than 60% in the 28 day OECD 301B and OECD 306 tests and are considered non-toxic in the marine environment based on the following results:

LC50 exceeds 1000 mg/lEC50 exceeds 1000 mg/lEC50 exceeds 1000 mg/l

HYDROX BIO 100 meets the detailed ecological definitions and requirements laid down in the 2013 Vessel General Permit (VGP) published by the US EPA in March 2013.

Safety Data Sheets (SDS) available to customers

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