Hi QAGB,
It's a useful link, thks, but just to illustrate the difficulties, the frying oil FFA limit is given as 2%. IMEX some customers only accept 1% (it may also relate to the specific oil). It's a bit like APC.
(By eye, I daresay some fast food operators go >> 2%).
Yes, I used to work in the industry of refined oils (did not manufacture - either repack or mixed oils per customer reqs) and some customers had their own requirements (although this was pretty rare). All in all, the bold statements in that link regarding the FFA and PV are the guidelines that we would follow for rejection/approval of raw materials as well as any finished product testing.