The IdEAL Solution


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


Description Emulsifiable, biodegradable sterntube lubricant for regular use and lubrication of some stabiliser bearings and CPP hubs.
Typical Viscosity (cSt @40°C) 220
Typical Viscosity Index 200
Density (kg/ltr@15°C) 0.93
Pour Point IP15 (°C) < – 24
Anti-corrosion SKF Water Emcor Test Passes
VGP Compliant

Emulsion Viscosity

Wear Scar


HYDROX BIO 220 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 220 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/l EC50 exceeds 1000 mg/l EC50 exceeds 1000 mg/l

HYDROX BIO 220 meets the detailed ecological definitions and requirements laid down in the 2013 Vessel General Permit (VGP) published by the US EPA in March 2013.

HYDROX BIO 220 lubricants (both neat oil and emulsion including 20% water contamination) has been successfully tested by Class and its stability, lubricating and corrosion protection performance has been verified by Lloyds Register.

HYDROX BIO 220 has become widely accepted as the lubricant of choice should vessels require emergency assistance in reducing leakage from the sterntube past a damaged or worn aft seal. It outperforms other competing biodegradable leak reducing lubricants by forming a stable, high viscosity emulsion at the point of water entry.

In the majority of cases a significant reduction in leakage rate can be achieved, typically up to 70%. The lubricant offers the greatest benefit when used to completely fill the sterntube system.

This product is approved for Emergency or Short Term Use Only. For specific details please contact us.

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