Aluminum fuel cell material thickness

I can't get to mine to put a mic on it but I need to go get some more aluminum sheet and I can't remember what thickness it is. Anyone know how thick of aluminum is used to make fuel cells?

Edited: 12/27/2007 2:45:17 PM by bdroppeddak

we have made some with 16 ga.... you could probably get away with 18 ga though....