Marine International

Stern Tube /Hydraulic System Oil

Stern Tube /Hydraulic System Oil

St-83a environmentally acceptable lubricant
for stern tubes marine hydraulic systems

biodegradable marine lubricant not oil but lubricant
kemel st-83a


2013 vgp of us epa

st-83a meets the eal (environmentally acceptable lubricant) specification in 2013 vgp of us epa.

Base fluid

polyethlene glycol, a type of polyalkylene glycol, is well known as non-toxic material. It is generally applied in cosmetics and medicines.


oecd 301c test method found st-83a readily biodegradable.



st-83a has been classified as harmless to aquatic lives under oecd 201, 202 and 203 tests.


st-83a is not bioaccumulative to aquatic lives because it is water soluble.

No sheen no sludge

st-83a is water soluble and forms no sheen or discoloration to the water. Also produces no sludge or emulsion under water surface.

High seawater tolerance

st-83a provides excellent lubrication and corrosion prevention even when the seawater content is 10%.

Seal compatibility

for stern tubes, kemel special seal of advanced fluoro-rubber should be applied. Regular viton seal is not compatible with st-83a.

Comparison of base oils for eal’s

base oil

polyalkylene glycol

vegetable oil

synthetic ester

non-sheening water tolerance

good good

poor poor

poor poor


granted in us (#7666822).


1) st-83a absorbs water contained in air. Piping design should be consulted with kemel.

2) normal paints cannot be used with kemel st-83a. Inorganic zinc primer should be used.

st-83a environmentally acceptable lubricant
for stern tubes marine hydraulic systems

product data


base fluid

polyethylene glycol

typical properties

1) physical and chemical properties

appearance pale yellow liquid

viscosity at 40oc 86 mm2s

viscosity at 100 oc 15 mm2s

density at 15 oc 1.13 gcm3

pour point -8 oc

flash point 225 oc (coc)


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Marine International

Plot No. 1129, Hari Khushal Complex, Office No. 3, Rubber Factory Road, Bhavnagar, Gujarat - 364002, India

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