BioStat RangeEnvironmentally responsible thruster/stern tube lubricantDescriptionCastrol BioStat environmentally acceptable lubricants are specifically designed to replace conventional lubricants in thestern tube bearings and thruster gearboxes of ships. Small quantities of lubricant can be discharged into the marineenvironment in the course of normal operation of vessels, but the cumulative amount for all vessels is very large. Largerquantities of oil may be released under fault conditions.Castrol BioStat lubricants are formulated from synthetic ester base oils which are selected to give a wide operatingtemperature range and long service life.Castrol BioStat lubricants have been tested and registered according to OSPAR (Oslo and Paris Convention for theProtection of the Marine Environment of the North-East Atlantic) requirements and therefore meet the definition of anEnvironmentally Acceptable Lubricant (EAL) under the US Vessel General Permit for Discharges Incidental to theNormal Operation of Vessels (VGP) 2013.ApplicationThe Castrol BioStat range of lubricants has been developed to replace conventional mineral oil based lubricants in thestern tube bearings and thruster gearboxes of all vessels operating in the marine environment. Castrol BioStat can alsoreplace conventional gear oils in the gearboxes of deck machinery, where there is a risk of spills or leaks duringoperation or maintenance activities.Castrol BioStat has been approved by all the major stern tube seal manufacturers for use in their equipment. In many，cases, it is necessary to specify a particular type of sealing ring whenever an environmentally acceptable lubricant isused. Conversion to an EAL is therefore most easily carried out during a dry-docking. The inspection interval for the sterntube seal may also be reduced for some lubricant/sealing ring combinations.Castrol BioStat provides extremely high gear and bearing protection and can replace conventional gear oils in thrustergearboxes. Propeller shaft seals for thrusters are similar to those of stern tubes and the same reservations aboutsealing ring types apply.AdvantagesReduced environmental impact when compared to conventional lubricants – demonstrable benefits in the following keyenvironmental performance criteria:Superior biodegradationSignificantly reduced bioaccumulation* and toxicityEnhanced renewability*Using OSPAR criteria for assessing bioaccumulation potential.High levels of protection given to bearing and gear components, particularly at high loads and low speeds, which cancontribute to extended component life and increased reliability:Load carrying performance to failure load stage 13 (or better) in the FZG gear test.Minimal wear in FZG low speed gear wear test.Minimal wear in FAG FE8 bearing test, at both standard (80 kN) and increased (100kN) radial load.Castrol BioStat lubricants have been tested and registered according to OSPAR (Oslo and Paris Convention for theProtection of the Marine Environment of the North-East Atlantic) requirements and therefore meet the definition of anEnvironmentally Acceptable Lubricant (EAL) under the US Vessel General Permit for Discharges Incidental to theNormal Operation of Vessels (VGP) 2013.

Typical CharacteristicsName Method Units BioStat 68 BioStat 100 BioStat 150 BioStat 220Viscosity, Kinematic 40°C ASTM D445 mm²/s 68 100 150 220Viscosity, Kinematic 100°C ASTM D445 mm²/s 13.3 16.9 21.7 28.4Viscosity Index ASTM D2270 178 178 178 178Density @ 15°C, Relative ASTM D4052 g/ml 0.93 0.93 0.93 0.93Pour Point ASTM D97 -39 -27 -27 -27Flash Point Closed ASTM D93 °C >220 >220 >220 >220Steel Corrosion - Seaw ater Water ASTM D665 Rating Pass Pass Pass PassCorrosion protection, 0.5% NaCl (SKF Emcor) ISO 11007 Rating 2-2 2-2 2-2 2-2Copper Corrosion (100°C / 3 hrs) ASTM D130 Rating 1A 1A 1A 1ADemulsification time @ 54C ASTM D1401 ml/ml/ml 0/23/57(30)Demulsification time @ 82C ASTM D1401 ml/ml/ml 0/23/57(30) 0/23/57(30) 0/23/57(30)FZG Gear Test DIN 51354 Pt 2 13 >13 >13 >13FZG Micro-pitting Test FVA No 54 > 10 > 10 > 10 > 10The above figures are typical of those obtained with normal production tolerance and do not constitute a specification.