Polyphenylsulfone (PPSF or PPSU) is a type of high performance polymer usually consisting of aromatic rings linked
by sulfone (SO2) groups. The commercially important polysulfones are prepared by condensation of 4,4'bis
(chlorophenyl) sulfone with various bisphenols. Two bisphenols for this application are bisphenol A (the polymer being
called PSF) and 4,4'-bis(4-hydroxyphenyl)sulfone (the polymer being called PES). These are moldable plastics often
used in rapid prototyping and rapid manufacturing(direct digital manufacturing) applications. Polyphenylsulfone is a
heat and chemical-resistant suited for automotive, aerospace, and plumbing applications. Polyphenylsulfone has no
melting point, reflecting its amorphousnature,[2] and offers tensile strength up to 55 MPa (8000 psi). Its commercial
name is Radel.[3] In plumbing applications, polyphenylsulfone fittings have been found to sometimes form cracks
prematurely or to experience failure when improperly installed using non-manufacturer approved installation
methods or systems