Originally Posted By squark
Ok, now I am confused - mL is a unit of volume, so how does it translate to thickness?


It doesn't translate to thickness at all. Its just that the mL thing causes "mil" to be associated with the metric prefix "mili". Than can then be wrongly applied to thickness when people see "mil" related to thickness, they see "mil" and they think "mili" and they know they're dealing with thickness so they go to milimeter. Might not have been less confusing this time, but if not, maybe someone else gets it and can put it differently.

OregonMouse, thanks for looking that up. I've often wondered about that, but never got around to looking it up. I knew it had to be a non metric unit, because the metric unit used on the packages is micrometers (that funny shaped u thing)m.