Marine vessels are driven through the ocean by means of a propeller, connected to the diesel engine via a propeller shaft . Housing this assembly is the stern tube, containing bearings and seals. The bearings provide structural support of the shaft and allow it's smooth and unrestricted rotation. The stern tube also houses oil and water sealing "glands", aiding the expulsion of seawater and maintaining the oil integrity. This whole assembly plays a vital part in marine propulsion and pollution prevention.
We understand it can be difficult to formulate and meet regulatory requirements around protecting the environment. Using our technical expertise and in-depth application knowledge, our products have been developed with meeting these regulatory challenges in mind. Our most recent product innovation is Emkarox™ VG NS, a range of innovative, non-sheening base fluids which allow the formulation of compliant lubricants without compromising on performance, even in the presence of water.
Available in ISO 100 and ISO 150 grades, these base fluids and possess the properties of a conventional base oil, but also have the unique ability to partition into water. The image on the right shows this unique mode of action.
Emkarox VG NS base fluids:
The video below simulates what happens when a stern tube oil becomes expelled into seawater. The Static Sheen Test (EPA Method 1617) was used. Conventional stern tube oil, Emkarox VG100NS and Emkarox VG150NS were added to synthetic sea water at room temperature.
The video clearly shows that conventional oil imparts sheening on the surface on the water. Conversely, both Emkarox VG NS fluids sink and ultimately disperse in the seawater.
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