Polyetherimide (PEI) Sheet & Rod | High Performance Thermoplastic

Common Properties

Common Brand Names ULTEM®, TECAPEI™, SUSTAPEI, Duratron™ PEI
Typical Thickness Size 0.060 - 3 in
Typical Lengths 12 - 48 in
Typical Widths 12 - 24 in
Friendly Names PEI Material, PEI Plastic
Common Profiles Sheet, Rod
Typical Rod Diameter 0.250 – 6 in
Grades Unfilled, Glass-Filled

Physical Properties

Mass per unit volume of a plastic material. 0.9-2.2g/cm³
Percentage of water absorbed by a plastic material after immersion. 0.01-1.5%
Percentage of moisture absorbed by a plastic material when exposed to humid conditions at equilibrium. 0.1-3.5%
Dimensional reduction of a plastic part after it cools down post-molding. 0.1-2.5%
Rate at which a thermoplastic polymer flows through a specific die when extruded under standardized conditions. 0.1-50g/10 min

Electrical Properties

Dielectric Strength 830V/mil
Dielectric Constant 3.15at 1 MHz
Dissipation Factor 0.0025at 1 MHz
Volume Resistivity 1.0E+17Ohm-cm
Surface Resistivity 1.0E+16Ohm/sq
Arc Resistance 120s
Comparative Tracking Index (CTI) 150V
Thermal Coefficient of Dielectric Constant 0.012%/°C
Electrostatic Discharge (ESD) Sensitivity Low
Breakdown Voltage 16kV/mm

Mechanical Properties

Hardness, Rockwell R 125R
Tensile Strength, Ultimate 104MPa
Tensile Strength, Yield 94MPa
Elongation at Break 30%
Elongation at Yield 6%
Modulus of Elasticity 3400MPa
Flexural Yield Strength 152MPa
Flexural Modulus 3500MPa
Compressive Yield Strength 110MPa
Bearing Yield Strength 95MPa
Shear Strength 69MPa
Izod Impact, Notched 0.6J/cm
Izod Impact, Unnotched 5J/cm
Gardner Impact 40J
Falling Dart Impact 25J
Instrumented Impact Total Energy 12J

Thermal Properties

CTE, linear 54µm/m-°C
CTE, linear, Transverse to Flow 80µm/m-°C
Deflection Temperature at 0.46 MPa (66 psi) 198°C
Deflection Temperature at 1.8 MPa (264 psi) 170°C
Vicat Softening Point 215°C
Flammability, UL94 V-0
Max Continuous Operating Temperature in F 340°F
Minimum Operating Temperature in F -40°F
Thermal Conductivity 0.22W/m-K

Regulations

UL-94 Flame Class
FDA
ASTM/Mil-Spec
USP Class VI
FAR 25.853 Flammability
FAR 25.853 Smoke
Boeing/Airbus Toxicity
D635 Self Extinguishing
FAR 25.853 Heat Release (OSU 65/65)
RoHS Compliant
REACH Compliant

Get a Quote for Polyetherimide (PEI) at Piedmont Plastics

Polyetherimide (PEI) is a high performance thermoplastic engineered for extreme durability and stability under demanding conditions. Available in sheet and rod form, PEI plastic is recognized for its excellent strength-to-weight ratio, superior heat resistance, and outstanding electrical insulation properties. With its ability to maintain physical integrity at elevated temperatures, PEI is trusted across industries such as aerospace, automotive, medical, and electrical engineering.

Contact Piedmont Plastics today to request a quote or speak with an expert about your PEI needs.

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Key Features of Polyetherimide (PEI)

Polyetherimide combines mechanical strength with exceptional thermal and electrical properties. Its unique structure makes it an ideal material for critical applications where reliability is non-negotiable.

High strength and stiffness
Excellent dimensional stability
Heat resistance up to 340°F (170°C) continuous use temperature
Outstanding electrical insulation
Good chemical resistance
Flame resistant with UL-94 V-0 rating
Easy to machine, fabricate, and thermoform

Benefits and Advantages

PEI plastic delivers performance benefits that extend beyond simple durability. Engineers and designers choose PEI sheet and rod for its ability to replace metal components in weight-sensitive applications while retaining exceptional mechanical properties. Take advantage of these benefits by requesting a quote from Piedmont Plastics today.

Get a Quote for PEI

ultem 2300 pei fabricated part piedmont plastics

Common Applications

Polyetherimide is relied upon in industries that demand strength, heat resistance, and electrical performance.

Aerospace components: lightweight, flame-resistant parts for interior and structural use
Automotive parts: high temperature under-the-hood components
Medical devices: sterilizable surgical instruments and housings
Electrical insulation: connectors, circuit boards, and insulating components
Industrial equipment: durable parts that withstand heat and wear

Frequently Asked Questions

Below are some commonly asked questions about Polyetherimide (PEI) and how it performs in different environments.

PEI offers higher heat resistance and better electrical properties than many standard engineering plastics, making it ideal for demanding environments.

Yes. In many applications, PEI provides comparable strength at a fraction of the weight, making it a preferred choice in aerospace and automotive industries.

Piedmont Plastics offers PEI in both sheet and rod form, with custom sizes available upon request.

Why Buy from Piedmont Plastics?

Piedmont Plastics is a trusted supplier of Polyetherimide (PEI) sheet and rod, with decades of experience serving high performance markets.

Nationwide network of branches: Local inventory and fast delivery across North America
Custom cutting and fabrication services: Precision machining and cut-to-size options for PEI
Deep industry expertise: Technical knowledge to guide material selection and applications
Wide product selection that supports a one-stop-shop experience: Access to a full range of performance plastics for your projects