Polyetherimide Explained

Polyetherimide (PEI; branded as Ultem[1]) is an amorphous, amber-to-transparent thermoplastic with characteristics similar to the related plastic PEEK. When comparing PEI to PEEK, the former is cheaper but has lower impact strength and a tighter temperature range.[2]

Due to its adhesive properties and chemical stability it became a popular bed material for FFF 3D printers.

Structure

The molecular formula of the PEI repeating unit is and the molecular weight is 592.61 g/mol.[3] It contains phthalimide and bisphenol A sub-units.

Properties

The glass transition temperature of PEI is 217 °C (422 °F). Its amorphous density at 25 °C is 1.27 g/cm3(.046 lb/in³). It is prone to stress cracking in chlorinated solvents. Polyetherimide is able to resist high temperatures while maintaining stable electrical properties over a wide range of frequencies. This high strength material offers excellent chemical resistance and ductile properties suitable for various applications, even those involving steam exposure.[4]

Notes and References

  1. Web site: Ultem . Curbell Plastics . 2 November 2023.
  2. http://www.mcmaster.com/#ultem/=otzvqt Referenced Oct 7, 2013
  3. Web site: polyetherimide information and properties. Scott. Chris. www.polymerprocessing.com. en. 2018-04-30.
  4. Web site: Injection Molding Material Selection Guide. www.abtecinc.com. en-US. 2018-04-30.