polyetherimide

{{Not to be confused with|Polyethylenimine|text=Polyethylenimine, also known as PEI}}{{More citations needed|date=September 2014}}

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| Verifiedfields = changed

| verifiedrevid = 399329937

| ImageFile = Polyetherimid.svg

| ImageSize = 255px

| IUPACName = 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

| OtherNames = PEI, Ultem

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 61128-46-9

| PubChem = 505862236

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 151672

| SMILES = CC(C)(c1ccc(Oc2ccc3c(c2)C(=O)OC3=O)cc1)c1ccc(Oc2ccc3c(c2)C(=O)OC3=O)cc1.Nc1cccc(N)c1 }}

|Section2={{Chembox Properties

| Formula = (C₃₇H₂₄O₆N₂)_n

| MolarMass = Variable

| Appearance = Amber-to-transparent solid

| Density = 1.27 g/cm³

| MeltingPt =

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|Section3={{Chembox Hazards

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{{Infobox material

| name = Polyetherimide

| density = 1.27 g/cc

| water_absorption_24h = 0.25%

| glass_transition = 215 C

| heat_deflection_temp = 210 C

| heat_deflection_temp_note = at 0.46 MPa / 66 psi

| vicat = 220 C

| tensile_strength = 115 MPa

| elongation = 60-80%

| izod_impact_strength = 25-60 J/m

| upper_working_temp = 375 C

| lower_working_temp = 365 C

| footnotes = Data via Sastri et al., 2014.{{Citation |last=Sastri |first=Vinny R. |title=8 - High-Temperature Engineering Thermoplastics: Polysulfones, Polyimides, Polysulfides, Polyketones, Liquid Crystalline Polymers, and Fluoropolymers |date=2014-01-01 |work=Plastics in Medical Devices (Second Edition) |page=183 |editor-last=Sastri |editor-first=Vinny R. |url=https://linkinghub.elsevier.com/retrieve/pii/B9781455732012000082 |access-date=2025-05-05 |place=Oxford |publisher=William Andrew Publishing |doi=10.1016/b978-1-4557-3201-2.00008-2 |isbn=978-1-4557-3201-2 }}

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File:DG 東莞 DongGuan 南城區 Nancheng 鴻福路 HongFu Road 東莞京東商場 JD Mall Electronics Showroom 3D printers December 2024 R12S 06 (cropped).jpg build plate on a Bambu Lab A1 mini FFF 3D printer]]

Polyetherimide (PEI; branded as Ultem{{cite web |title=Ultem |url=https://www.curbellplastics.com/materials/plastics/ultem/ |publisher=Curbell Plastics |access-date=2 November 2023}}) 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.http://www.mcmaster.com/#ultem/=otzvqt Referenced Oct 7, 2013

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.{{Cite web|url=https://www.thomasnet.com/insights/what-is-polyetherimide-pei-/|title=What Is Polyetherimide (PEI)?|language=en-US|access-date=2024-10-15}}{{Citation |last=Melton |first=George H. |title=2 - Engineering Thermoplastics |date=2011-01-01 |work=Applied Plastics Engineering Handbook |page=15 |editor-last=Kutz |editor-first=Myer |url=https://linkinghub.elsevier.com/retrieve/pii/B9781437735147100029 |access-date=2025-05-05 |series=Plastics Design Library |place=Oxford |publisher=William Andrew Publishing |doi=10.1016/b978-1-4377-3514-7.10002-9 |isbn=978-1-4377-3514-7 |last2=Peters |first2=Edward N. |last3=Arisman |first3=Ruth K. |quote=Polyetherimide (PEI) was formally announced by GE in 1982. This amorphous polymer with the Ultem trade name resulted from the research work of a team headed by J.G. Wirth in the early 1970s.}}

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