[ukumpire]

In the UK, even though we are ESF/ISF affliated, we use the ASA Banned Bat List as our source.
Not to be quoted on, but I believe that many other ISF Countries use the ASA List.
And really pushing the boat out a bit more, I think that ESF (European Softball Federation) uses the ASA List at it's tournaments, I stand to be corrected.

The ASA banned bat list is the only real source of approval, that is tried and tested, and works for the safety of all.

I would also like to state that Banned Bats are a very serious subject with ISF/ESF and we are consistently checking bats before every game and tournament, and the 'bad ones' are held till end of game/tournament by the technical officer.
Bats that are approved at the checking time, get a identifiable label that approves it.
Low and Behold anyone that tries to use an illegal bat, especially after Holland 2 seasons ago, when an illegal bat almost killed a National pitcher, to the point where he was on life support, it will not be tolerated, and is punishable by 'death' ... well a long ban anyhow.