Polysulphone and PEI


Sighting or observation windows for medium temperature reactors etc where food is produced & glass cannot be used. Distributor valves in the poultry industry. Medical equipment & components. Steam cleaning equipment. Components where autoclaving required over long-term.


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  • Sizes/ Uses/ Properties
  • Technical and Other Data
  • Colour Information

Product Availability

Max Sizes (NB: We cut to size from these)
Price Guide per Square Metre (Material Cost Only)
Sheets or cut components Amber tint to brown
Up to 40mm
Please ask. Not cheap.

Key Properties

Polysulphones such as PSU 1000 and PPSU 1000 are made from non-UV-stabilised Polysulphone resin. They offer very good radiation stability, low ionic impurity levels & good chemical & hydrolysis resistance. PSU & PPSU often replace polycarbonate whenever higher temperature resistance & improved chemical resistance are required. Polyetherimide (PEI 1000) is a much darker material.


  • High maximum allowable service temperatures continuously in air - PPSU 1000 - 180°C & PEI 1000 - 170°C & PSU 1000 - 150°C
  • High mechanical strength, stiffness and creep resistance, also at elevated temperature.
  • Also excellent hydrolysis resistance (suitable for repeated steam sterilisation)
  • High toughness, even at low temperatures
  • Physiologically inert (suitable for food contact)
  • Very good dimensional stability
  • Translucent, non-optical quality (except for PPSU 1000 which is black) PSU 1000 can be polished to give >85% CLARITY. PEI is darker.
  • Very good resistance against high energy radiation (gamma and X-rays)
  • Good electrical insulating and dielectric properties


  • Colour varies from a pale yellow tint when psu 1000 is polished to translucent dark tan for PEI.
  • PPSU is opaque black
  • More expensive than polycarbonate

Chemical Name

Polysulphones (PSU)
Polyetherimide (PEI)


Sighting or observation windows for high temperature reactors. High heat resistance. electrically insulating, physiologically inert, creep resistance.

Additional Information

Polysulphone (PSU) and Polyetherimide (PEI)

Density g/cm^3
Shrinkage %
UV Resistance
Transparency (% visible light transmission) %
H2O Absorption After 24 hours %
Maximum Continuous Working Temperature (Zero Tensile effect after 11 years)

Low °C

High °C

Polysulphone PSU          

PSU - Fair

Can be polished to app 80-85% claritywith Yellow tint.

0.2 to 0.8
Short Term 180 oC Long Term 160 oC 




0.7 to 0.8
Fair Opaque Black
0.2 to 0.3
  PEI Long Term 170 oC
Hardness Shore D Mpa
Tensile Strength at Break Mpa
Elongation at Break %
Flexural Modulas Gpa
Toughness by Notched IZOD Impact at Room Temperature J/m
Fire Resistance LOI %
Dielectric Strength (Insulation Value) KV/mm thickness
Polysulphone PSU          
70 to 80
50 to 100
2.7 to 3
60 to 100
30 to 32
15 to 100  
95 to 99
100 to 110
59 to 60
3 to 3.4
0.2 to 0.3
28 - 33

Polysulphone (PSU) & PEI etc - Colours


The colours are transparent brown, PEI having the darker colour.
Clarity can be improved. See the illustation below.



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