Cortosis cost factor?

[Lord Azagthoth]

As for isolating yourself from the Force, you have a few option. Carry a pet ysalmiri with you, transfer your brain into a droid (likely a permanent transfer), originate from another galaxy, or, find a way to genetically modify yourself with the anti-Force gene from ysalmiri. Good luck with anything but the pet, though.

The Yuuzhan Vong are Force Immune.

The Cortosis in my campaign simply adds Hardened (enough to cancel out the Armor Divisor of an upgraded lightsaber) when its used to create the alloy but only in pure form it will disable a lightsaber (which can be turned on immediately but the user will be surprised for a moment).

Cortosis also has a high resistance, not only against heat (or energy) but also against physical damage (at least what I've read in the Darth Bane novel).

But this may all change with the new Canon rules from Disney. Cortosis is just part of a legend and might not exist at all.