Cortosis-weave

Cortosis-weave was a swordsmithing technique commonly used on high-quality vibroblades and other melee weapons when combat with opponents wielding lightsabers was considered to be likely. Several cultures developed various techniques for insulating traditional melee weapons against such sparring damage, but the art of bonding cortosis to blades in such a manner was first perfected by Echani weaponsmiths sometime prior to the Mandalorian Wars.

Behind the scenes
Since cortosis ore actually shorts out lightsaber blades on contact, forcing the weilder to reignite his weapon. one can only assume that when it is weaved into vibroblades the effect is somehow diluted. Instead of shorting out a Jedi or Sith opponent's blade, the weave simply prevents the lightsaber from cleaving the blade in two at the point of contact.

Appearances

 * Star Wars Knights of the Old Republic