Polymers
PEI, unfilled / ULTEM resin-based stock
Polymer / filler family, not a unique commercial grade. The cited named product is an example only.
Identity / state reference
What distinguishes this material
PEI is amorphous; ULTEM is a resin trademark, while TECAPEI identifies an Ensinger stock shape. A glass transition is not a crystalline melting point.
- Designation in this reference
- Polyetherimide (PEI)
- Forms covered by the sources
- Stock-shape rod / plate; confirm supplier process and dimensions
- States to distinguish or confirm
- Exact compound, color and additives recorded
- Extruded / molded route and stress relief recorded
- Temperature and exposure
- Melting point, glass-transition temperature, heat-deflection test and long-term service rating are different quantities. Use a grade-specific value with its load, duration and test conditions.
Other search names in these sources
ULTEM PEI · TECAPEI natural
Read the scope above: a source’s related product name is not a blanket interchangeability statement.
Property evidence for a stated condition
No condition-specific numerical table is reproduced here
The linked sources establish the identity and the stated product/state scope. Obtain the row for your actual form, section, treatment and test conditions before adopting strength, hardness or a thermal limit.
Resolve these conditions next
- Which manufacturer, exact grade, filler fraction and stock form are specified?
- What moisture conditioning, direction, test method and service temperature apply?
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Sources and what they establish
Reviewed 23 October 2026. A source’s publication date and the review date are different. The scope below identifies the fields checked.
Ensinger PEI material and TECAPEI stock shapes
PEI chemistry, ULTEM resin branding and TECAPEI unfilled / GF30 stock-shape distinction. Not a blanket certification for all PEI.
Ensinger PEI material and TECAPEI stock shapes ↗Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
- The old 105 MPa and 170 °C claims lack a full product/state definition.
- Do not generalize a UL94 result without grade, color, thickness and listing.
Related references
Compare reinforced high-temperature polymers
Review the specific reinforced product and polymer identity. Do not apply an unfilled PEI value to a glass-filled PEI or PPS record.
Keep flammability classifications with the specimen
Read the UL 94 terminology before applying a product classification to a different thickness, form or test condition.