How to determine the ignition temperature using the TG-DTG transition point method
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It is generally believed that the ignition temperature of a sample determined using the TG-DTG transition point method in thermogravimetric analysis is relatively accurate, but sometimes it can be difficult to identify this transition point, as the two curves obtained under air and nitrogen atmospheres may start to diverge at very low temperatures. I came across a study that provided a specific definition for this boundary point: the ignition temperature is identified at the position where the relative difference between the values of the two DTG curves reaches 3%. What does “the relative difference” refer to? How is it calculated using thermogravimetric data?
This post was last edited by qugd on 2020-11-23 at 17:34. The relative difference refers to the relative deviation. There are specific testing methods for determining the ignition temperature of flammable substances; however, the methods that involve estimating the ignition point using thermogravimetric or differential thermal analysis data yield significant discrepancies compared to the values obtained through the standard testing methods for determining the ignition point. You can consult the author of that article, or make an estimate based on certain experimental conditions. Not many people in the chemical industry are familiar with this type of thermogravimetric analysis; including me, I only have a very basic understanding of it – I don’t even know much about it at all.
Thank you very much for your answer! I was wondering if you are familiar with the method for calculating the relative deviation of thermogravimetric data; could you offer some guidance?:)