Why is afff foam good for fire fighting?

I wouldn't agree that afff is good for fire fighting. Perhaps at one time it was, before there were more cost effective and environmentally friendly options on the market. There are now wetting agents such as Novacool UEF (Universal Extinguishing Foam) that are a much better option. This foam, which is UL listed and certified under NFPA 18, is used at 1/6 to 1/12 of the concentration of AFFF and is bio-degradable.

AFFF is most effective in a contained pool of Class B flammables but is not effective on 3 dimensional fires where Novacool UEF is.

AFFF is outdated technology and needs to be replaced by modern day technology.