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Lube-Tech


power of bright stock but also had comparable oxidation stability without the addition of sulphur. Croda BSA is 85% biobased. The following piece outlines the results of our testing of the product’s performance in comparison to bright stock alternatives.


Fig 2: Viscosity Impact ISO Grades.


The improved thickening power of the BSA is evident in Fig. 2. Approximately one fifth of the concentration is needed to achieve the equivalent (ISO*) viscosity and far in excess of the limitation of the standard bright stock.


Oxidation


Bright stock is inherently oxidatively stable due to the residual sulphur content acting as an antioxidant, so part of the brief for an alternative was to compare directly with bright stock. We also extended the testing to include Group II base oil as the natural replacement to the reducing Group I stocks. The screening used the Rapidoxy static oxidation tester, manufactured by Anton Paar under ASTM 7545.


The test comprises of a pressurised chamber at an elevated temperature, observing oxygen consumption as a function of time; consumption of 10% oxygen denotes the rapid onset of oxidation or the oxidation induction time (OIT).


Initial test results (Fig 3) show the extent of the protection against oxidation that can be achieved *Core is a trademark of Exxon Mobil Corporation


Fig 4: Residue formation Rapidoxy test – 10% in Core 100.


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.126 page 2


with bright stock without the use of an antioxidant package. When compared to the BSA there is a slight reduction in overall oxidation stability, but this is not the whole story; further analysis highlights the deficiencies of the higher sulphur Group I base oils which is clearly demonstrated in Fig 4. Oxidation deposits (sludge) are reduced when used in Group I base oils compared to bright stock. This is also highlighted in oven tests showing a reduction in deposits and reduced colour change in a test of the neat products (Fig 5).


The same can be seen when tested in Group II. Fig 6 shows that the BSA increases the OIT time compared to the neat material. Fig 7 shows that the sludge/ deposit formation is not as evident in Group II but there is an improvement in colour change compared to bright stock.


Oxidation stability at 180°C: 10% in Core ™* 100 Group I base oil


Fig 3: Comparative oxidation protection.


Colour, deposit and sludge formation


LUBE MAGAZINE NO.155 FEBRUARY 2020


29


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