Polyetherimide (PEI) Sheet & Rod | High Performance Thermoplastic

Common Properties

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

Electrical Properties

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

Mechanical Properties

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

Physical Properties

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

Regulation Properties

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

Thermal Properties

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

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