PEI Polyetherimide (Ultem)
Polyetherimide (PEI), marketed as Ultem, is a high-performance amorphous thermoplastic. It is characterized by its high heat deflection temperature, excellent dielectric properties, and good solvent resistance. It is inherently flame retardant (UL 94 V-0) without the need for additives.
Technical Specifications
Catalog reference values. Confirm the grade, test method, and operating conditions against the supplier datasheet before specifying the material.
Features
- Inherent flame retardant (V-0)
- Excellent dielectric properties
- High thermal resistance
- Natural amber transparency
Applications
Available Forms & Sizes
| Form | Dimensions | Color |
|---|---|---|
| Round rod | Ø10–150 mm × 1000 mm | Natural (amber) |
| Plate | 610 × 1220 mm, thickness 6–60 mm | Natural (amber) |
Processing & Machining Notes
The catalog describes carbide machining of PEI and warns of stress cracking in contact with certain solvents, including acetone and MEK.
General catalog guidance. Cutting, cooling, and heat-treatment parameters need validation for the specific grade and part.
Standards and documentation to confirm
These catalog references do not certify every grade or batch. Request the supplied grade’s document and application scope, especially for food contact, medical use, or ESD protection.
View supporting documentsQuestions about this material
What is PEI and what is it used for?
High-performance amorphous thermoplastic with exceptional thermal resistance and dielectric properties.
What continuous service temperature does the catalog list for PEI?
The catalog lists 170 °C for continuous service of PEI. This is distinct from melting temperature; confirm the grade’s limit and operating conditions with the supplier.
What industries use PEI?
PEI is used in: Aerospace components, High-temperature electrical connectors, Medical instrumentation, Reflectors and lenses.
How do you machine PEI?
The catalog describes carbide machining of PEI and warns of stress cracking in contact with certain solvents, including acetone and MEK..
What documentation should I confirm for PEI?
The catalog references: UL 94 V-0, FAR 25.853, ISO 10993 (medical grade), FDA (food contact), RoHS. Request documentation for the supplied grade and batch, and confirm its scope before specifying the material.
What forms and sizes is PEI available in?
PEI is available in: Round rod, Plate. Custom dimensions available on request.
What is the density of PEI?
The density of PEI is 1.27 g/cm³. This value is important for calculating machined part weight.
