Hi, I noticed that there are unexpected weight gain on the TGA curve when I ran my sample ( calcium sulphate hemihydrate) whereby there should be weight loss happen due to loss of water. I ran my sample under Nitrogen gas flow; 50mL/min with heating rate of 10degree/min. Can anybody explains why? I've attached the curve obtained. Thank you in advance.
Possible generic reasons for weight gain detection in TGA were discussed elsewere at this forum:
https://www.researchgate.net/post/Why_my_TGA_graph_shows_a_weight_gain https://www.researchgate.net/post/What_is_the_process_to_get_a_weight_Gain_in_TGA https://www.researchgate.net/post/What_are_the_reasons_for_weight_gain_in_TG_curve_My_sample_is_Cement_and_the_weight_gain_is_in_the_temp_range_of_400_to_650_degree
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