LuLu,
There is a range of the concentration of active ingredienant that can be in a relaxer. For lye I think it is I beleive and someone please correct me if I am wrong, that a mild by defenition has 1.85-2.0% NAOH and a regular 2.0-2.2 %NaOH and a super is 2.2-2.25%. I think I read this a loooong time ago.If the numbers are wrong I think the concept is correct. A few of the large professional size ones have the percentage on it. So hopefully this helps answer your question. I am not familiar with the no lye concentrations.