ThermaX™ PPSF (PPSU) 3D Printing Filament (Aerospace, Industrial)ThermaX PPSF (PPSU) 3D Printing Filament Polyphenylsulfone (PPSF or PPSU) is a high temperature aromatic sulfone polymer. Long considered to be one of the highest performance polymers in the plastics world. PPSF has excellent thermal and chemical resistance, making it well suited for demanding applications in automotive, aerospace, electronics, defense, industrial, medical, semi con applications. ThermaX is 3DXTECH's brand of high temperature polymers