Glossary Of Terms
amorphous polymer
A polymer having no crystallinity; for example, polysulfone. See Thermoplastics.

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.


Property Measure Low Measure High
Specific gravity 0.0448 lb./in.3 (1.24 g/cc) 0.0448 lb./in.3 (1.24 g/cc)
Melting point Not Applicable Not Applicable
Glass transition temperature 370°F (188°C) 370°F (188°C)
Tensile strength at break Not Available Not Available
Elongation at break 50% 100%
Hardness durometer (Shore A) Not Available Not Available
Hardness durometer (Shore D) Not Available Not Available
Water absorption @ 24 hours 0.22% 0.3%
Sterilization Ethylene oxide (EtO)
Gamma and E-beam 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.