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The Solution to Outboard Oil Leakage
HYDROX 21 is a high quality sterntube oil which reduces oil leakage and pollution when the sterntube seals are damaged. It also protects against water ingress in the same way as other HYDROX grades.

Compatibility with other oils
HYDROX 21 is compatible with most conventional lubricants used for sterntube lubrication. It can therefore be added gradually by a process of topping up. As the proportion of HYDROX 21 in the system increases, leakage can be expected to reduce progressively.

 

HYDROX BIO 220
A biodegradable, non toxic version of HYDROX 21 is also available.

 

Case Study
Leakage rate is normally reduced by at least 70%, even where leakage is due to severely damaged seals.

 

Case Study 2

Vessel Year 1
Reefer 9979 dwt Built 1982 July: 3.6% water content – Hydrox 21 used as standard sterntube oil
Sterngear Year 3
Total oil capacity – approx. 2300 litres
Shaft diameter = 522mm
Shaft length = 5845mm
White Metal Bearings
Forward = 550mm
Aft = 1064mm
Plus skid bearing
Seal – Rubber lip seal – multi ring design		 May: 8.6% water content
Dec: 3.6% water content plus slight bacterial infection
Year 4
April: 26.7% water content
Aug: 10.9% water content plus slight bacterial infection
Original Year 5
SAE 30 Engine Oil - Changed to cylinder oil (260cSt@40°c) to combat leakage before introduction of Hydrox 21 Sept: 25.5% water content
Nov: 11.9% water content
Nov: Metal Analysis results obtained - Metal ppm, Copper 1, Iron 1, Lead 7, Nickel 0, Tin 2
April Year 1 Year 6
Vessel has been dry docked. Normal sterntube oil consumption not recorded but high consumption began to occur ranging from 230 litres – 400 litres per day though variable. Cylinder oil and then Hydrox 21 added by top up procedure. Diver inspection showed no obvious fault with the seal. April: Vessel dry docked. Shaft and bearings inspected and found to be in excellent condition and with no work required.
June Year1
Reported Sterntube oil consumption for complete trip reduced to 600 litres compared to 2000 litres for previous similar voyage.
Oil sample taken = 3.3% water content

 

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Performance acknowledged by classification societies
HYDROX 21 is certified under Lloyds Product Verification Scheme

HYDROX 21 is cerified under the ABS Type Approval Scheme. HYDROX 21 is certified under the Bureau Veritas Type Approval Scheme.

DNV normally allow vessels to operate with up to 15% water in the HYDROX 21 emulsion.