Okay, I must add my 2 cents in this dead thread.
First cent, there is an element named Cortosis that disable a lightsaber's blade during a few minutes. it was sometimes used during the clone wars, but was very fragile. Most of the time, it was used in alloy, but it was just able to block a lightsaber.
Remember this: in the Star wars universe, there is only 3 elements that can resist to a lightsaber:
- Cortosis Alloy. used during the clone wars and in Knights of the Old republic.
- Phrik alloy. the farting canes of grievous' bodyguards was in phrik alloy, but the best use was in the Dark Trooper project, as seen in Dark Forces.
- Mandalorian iron (or mando-metal) the best of all. light and resistant to everything known, Mando-Metal is used for every Mandalorian Armor. Jango & Boba Fett, Jaster Mereel, Jodo Kast, Monstross and every other mandalorians have their armor in Mando-Metal.
Second cent, beware of guns. if you carefuly look at the Imperial heavy repeater, you will see that it fires Metallic slugs, but they can be reflected by a lightsaber. So be careful.
Personally, I suggest you to use sonic guns: they can disturb the force and prevent a Jedi from using its force powers. then use a flamethrower to finish him.
Finally, the order 66 have done most of my work...