Polyetherimide

Polyetherimide
Polyetherimide
Physical properties
Density (ρ)	1.27 g/cc
Water absorption—over 24 hours	0.25%
Mechanical properties
Tensile strength (σt)	115 MPa
Elongation (ε) at break	60-80%
Izod impact strength	25-60 J/m
Thermal properties
Glass transition temperature (Tg)	215 C
Heat deflection temperature at 0.46 MPa / 66 psi	210 C
Vicat softening point	220 C
Upper working temperature	375 C
Lower working temperature	365 C
	Data via Sastri et al., 2014.

Polyetherimide
Names
	IUPAC name benzene-1,3-diamine; 5-[4-[2-[4-[(1,3-dioxo-2-benzofuran-5-yl)oxy]phenyl]propan-2-yl]phenoxy]-2-benzofuran-1,3-dione
	Other names PEI, Ultem
Identifiers
CAS Number	61128-46-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	151672 ;
ECHA InfoCard	100.126.800
PubChem CID	505862236;
CompTox Dashboard (EPA)	DTXSID90976644 ;
	SMILES CC(C)(c1ccc(Oc2ccc3c(c2)C(=O)OC3=O)cc1)c1ccc(Oc2ccc3c(c2)C(=O)OC3=O)cc1.Nc1cccc(N)c1;
Properties
Chemical formula	(C37H24O6N2)n
Molar mass	Variable
Appearance	Amber-to-transparent solid
Density	1.27 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Polyetherimide (PEI; branded as Ultem) 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.

PEI plastics were first introduced into the market by General Electric (GE) in 1982 under the trade name Ultem resulting from the work of J.G. Wirth's research team in the early 1970s.

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