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from Brown Corpus
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Differential thermal analysis showed a very small endothermic reaction at 340-degrees-C and a large endothermic reaction at 470-degrees-C.
This latter reaction is in accord with the reported decomposition of Af.
Thermogravimetric analysis showed a weight loss of 1.8% centered at 337-degrees-C and another weight loss of 10.8% at 463-degrees-C.
The expected weight loss for Af going to Af and Af is 10.6%.
Mass spectrometric analysis of gases evolved upon heating to 410-degrees-C indicated nitrogen oxides and water vapor.
The small reaction occurring at 337-degrees-C is probably caused by decomposition of occluded nitrates, and perhaps by a small amount of some hydrous material other than Af.
All subsequent measurements were made on material which had been heated to 375-degrees-C for one hour.
Emission spectra indicated Af calcium and all other impurities much lower.
Chromium analysis gave 58.8% Cr as compared with 61.2% theory.
However, Af adsorbs water from the atmosphere and this may account for the low chromium analysis and high total weight loss.

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