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.

HYDROX 21 is compatible with most conventional lubricant 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.

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