Adding fire retardant to plastic is straight forward [1,2]. One of the things about the NIST presentation [2] that is also relevant is that it discusses the add

Adding fire retardant to plastic is straight forward [1,2]. One of the things about the NIST presentation [2] that is also relevant is that it discusses the additives that are added to plastics for one reason or another. Those additives add additional difficulty in processing post consumer plastic into precursors for new things. [1] https://sciencing.com/burn-potassium-nitrate-7708552.html https://sciencing.com/burn-potassium-nitrate-7708552.html [2] https://www.nist.gov/sites/default/files/documents/el/fire_research/2-Reilly.pdf https://www.nist.gov/sites/default/files/documents/el/fire_r...