Continued from page 36


Test results - It’s all about statistics!


Figure 6.


A closer look into the ILS data discloses two sources of inaccuracy: the calculation of degradation data and the microorganisms introduced into the lubricant to test its biodegradability (the inoculum). In the case of the former, biodegradation is calculated by adding, step by step, each single difference between CO2


release R = 36% - no better precision?


of test sample and blank sample. Both numbers are small and close to each other, as demonstrated in the diagram below. Thus, calculating the difference ends up in broad variations. This is an inevitable error of the method as it is not possible to measure the blank and test sample in the same container.


Figure 7. Continued on page 40 38 LUBE MAGAZINE NO.160 DECEMBER 2020


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