Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE Figure 5. Thermogravimetric analysis, 250°C


However, TGA curves do not quite show a complete picture, as they do not say anything about the consistency of the greases throughout the process – which is obviously an essential feature of their lubricating function.


In order to find out about this, we interrupted the test a few


times to check the aspect of the grease. We confirmed that even though they had turned black, they remained soft and plastic: they kept their lubricating consistency up to their induction time, after which not much matter was left but bentonite clay, judging from the cracked aspect in the bottom of metal cups (Figure 6), thus confirming the clean burning propensity of such products.


No.95 page 5


Figure 6. Ester based grease aspect before and after Induction Time, 250°C LUBE MAGAZINE NO.123 OCTOBER 2014 35


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