Combustible Dust Posted on 5th November 201521st July 2021 by ThePD (The Project Definition) A Combustible Dust is any fine material that has the ability to catch fire and explode when mixed with air. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged dust, hazard, substance. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.