From my understanding 5083 is the same as ATP-5 (or at least “Modified 5083 Aluminum Alloy”). Just a matter if its pre-machined with in the same tolerances.
I’ve been told the tool plate can be more gummy compared to 6061-T6, I hadn’t had troubles with it when using single flutes but only has been with my modified Shapeoko, not before the mods.
Cast Aluminum Tooling Plate or Jig Plate
Is known by various trade names:
Mic 6® (a registered trademark of Aloca Inc)
Alpase K100-S® (a registered trademark of TST, Inc)
Alca 5™ (a trademark of PCP Canada)
Vista Metals ATP 5™ (a trademark of Vista Metals Corp.)
Alimex 5083
At least from composition, they seem to be the same:
Aluminium
Chromium: 0.05-0.25% max
Copper: 0.1% max
Iron: 0.4% max
Magnesium: 4.0 to 4.9%
Manganese: 0.4 to 1.0%
Silicon: 0.4% max
Titanium: 0.15% max
Zinc: 0.25% max