Is drywall mud considered combustible?

the carpenter

I've run into a situation where my friend wants to frame a non-combustible arch above his woodstove that is too close for clearances. I'm thinking metal studs and concrete backer board. My question is if the drywall mud is considered combustible or not? I would also need to use find out if a plastic corner bead would be okay or if there are any other options. Thanks in advance.

DangerMouse

mud is not combustible, i'd avoid using plastic

DM

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AtlanticWBConst.

Example: Compound is used on seams of fire-rated sheetrock, on fire-seperation walls, for code compliance.

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