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Who knows.
All I can say is that I use pretty much daily, it cleans up most of the stuff it claims to and doesn't ruin the skin on my hands. When I have to use harsher cleaning chemicals I almost always wind up feeling sick and the skin on my hands Is prone to splitting for weeks after.
Edit @mespilus knows a lot about chemistry and chemicals maybe he can make sense of this
Or I could spend some time familiarising myself with the COSHH sheet (unlikely to happen).
I actually tend to use this more these days. Lasts much longer than the tubs and can be used with either blue roll or jay cloths if you need to use something mildly abrasive.