what is mil finish aluminum?

[sean]

I saw aluminum sheet that has "mil finish" does anyone know what that refers to?
http://www.rvsurplussalvage.com/catalog/display.php?product_id=419

[mbader]

That's the finish aluminum has when it comes out of the mill.
Sheet is rolled to thinkness between 2 big rollers. It gets the finish from the rollers.