So, what's the flammability of this stuff like? Is it similar to PVC, which puts out NASTY fumes and keeps burning? I was thinking about using it as lightweight wiring conduit in the wings & fuselage of the airplane I'm gonna be building. It's lighter than the blue or gray Carlon electrical conduit, which is a major appeal for me. It's also not corrugated, which is the main reason I'm looking at it rather than the corrugated nylon split-loom-type material that other builders use. I don't want to pull multiple 18-24ga. wires through corrugated conduit... been there, done that, got the T-shirt and keychain.