PPSU

Polyphenylsulfone (PPSF or PPSU) is a high-temp amorphous polymer that offer exceptional thermal and chemical resistance.  PPSU is inherently flame retardant with a UL V0 rating based on it's chemical structure and requires no additional additives to achieve this flame rating.  

Print PPSU with Gearbox™ HT2 High-Temp 3D Printer.  Check it out HERE.