When the droid manufacturing company Roche designed its smelting droid, one of the largest hurdles was enabling the unit to resist the high temperatures that it must endure while working inside blast furnaces. After many failed attempts, Roche’s re search team finally perfects a formula that combines high-grade durasteel and kevlex. Dubbed duravlex, the off-white alloy is as strong as durasteel and is highly resistant to heat. Duravlex becomes the droid’s biggest selling point, and Roche profits greatly from selling a modified version of the formula to other companies. A droid equipped with a duravlex shell gains a + 10 equipment bonus to its Fortitude Defense to resist fire and extreme heat.

Source: Scavenger’s Guide to Droids, p. 54.