I worked one time at a plant that made school and office furniture, they had a section for making “hard plastics” which used some plastic powder that is mixed with wood saw dust and heated and pressed in forms. This is for making the seats and backs of chairs. This plastic powder says on the container that it “will cause cancer” not “might cause cancer”. They have had several employees die from cancer due to this plastic. I don’t recall seeing any material data sheets on it so I can’t tell you the exact chemical makeup of it.