Question: how much tfm is good for skin?
Answer: The most important factor to be considered in soap quality is its total fatty matter (TFM). Higher the TFM quantity in the soap, better is its quality. As per BIS, Grade 1 soaps should have 76 per cent minimum TFM, while Grade 2 and Grade 3 must have 70 per cent and 60 per cent minimum TFM, respectively.