PPS (Polyphenylene Sulfide) is a high-performance polymer that exhibits exceptional chemical resistance along with high thermal and mechanical properties.  Widely known as one of the most chemically resistant thermoplastic materials available, PPS is insoluble in any known solvent under 200°C and is easier to print than PEEK.  PPS 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 PEEK with Gearbox™ HT2 High-Temp 3D Printer.  Check it out HERE.