Polysulfone (PSU) is an amorphous polymer. Amorphous polymers do not have defined melting points but ranges at which they soften (called the glass transition temperature).

Polysulfone contains the subunit aryl-SO2-aryl (containing the sulfone group). It is known for holding its properties over a wide temperature range. PSU has the highest service temperature of all melt-processable thermoplastics. It has excellent strength and transparency; withstands exposure to water; and can be colored.

Specific gravity	0.0470 lb./in.3 (1.30 g/cc)	0.0470 lb./in.3 (1.30 g/cc)
Melting point	644°F (340°C)	649°F (343°C)
Glass transition temperature	289°C (143°C)	289°C (143°C)
Tensile strength at break	16000 psi (110.3 MPa)	16000 psi (110.3 MPa)
Elongation at break	50%	60%
Hardness durometer (Rockwell M)	99	99
Hardness durometer (Rockwell R)	126	126
Water absorption @ 24 hours	0.5%	0.5%
Sterilization	Ethylene oxide (EtO) Gamma radiation Steam autoclaving Vaporized hydrogen peroxide

This material data sheet is presented for reference only. For a specific application and environment, characteristics and performance may vary. Product design and suitability for use are the sole responsibility of Microspec’s customer. Microspec strongly urges customers to consult with the material manufacturer.