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Lube-Tech


Oven test at 180°C: Differences in colour, deposit and sludge formation, 10% in Group I


Fig 5: Residue formation Rapidoxy test – neat.


Oxidation and thermal stability at 180°C: 10% in Chevron 600R* Group II base oil


These formulations were tested using a PCS mini traction machine (MTM) using the following parameters. (See Fig 9).


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.126 page 3


Fig 8: Model gear oil formulations.


Fig 6: Comparative oxidation stability *Solubilised in 10% polyol ester


† 50% bright stock to give equivalent viscosity to 10% Croda BSA


Oven test at 180°C: Differences in colour, deposit and sludge formation, 10% in Group II +10% solubuliser


Fig 9: MTM parameters. Fig 7: Oven test at 180°C


Lubrication To test the lubricating nature of the BSA we initially tested it in a model Group I based industrial gearbox formulation using Afton’s Hitec® package. (See fig 8.).


30 LUBE MAGAZINE NO.155 FEBRUARY 2020 317 gear oil additive


Initially utilising the barrel on disk, higher contact pressures can be achieved than using ball on disc. The results observed in fig. 10 showed a consistent reduction in friction coefficient up to approximately 2.1 Gpa, demonstrating that in addition to the thickening effect of the ester based BSA, there is a positive effect on lubrication.


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