The IdEAL Solution


SEAL-OF-APPROVALThe 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) 68
Viscosity Index 215
Density (kg/l @15°C) 0.92
Pour Point ASTM D7346 (°C) < –24
Anti corrosion SKF Water Emcor Test Passes
VGP Compliant


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

Safety Data Sheets

This section of the website requires registration

Please log-in

Forgot your password or username?

Reset your password here

Not registered?

Please complete the registration from below if you do not have an account with us.


  • Lower case letters and numbers only
  • Please ensure you enter an email address that you can access. An activation email will be sent to this address when you submit the form.
  • Your information

    This form collects and stores your information so we can create your account enabling you to access our Safety Data Sheet (SDS) Records. Please read our Privacy Policy for more information about how we manage your data.

  • This field is for validation purposes and should be left unchanged.