Polyetherimide (PEI)

Alternative and trade names
Ultem™

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Description

Long-Term Heat Resistance: Excellent stability of physical and mechanical properties at elevated temperatures thanks to high glass transition temperature of 217°C. available with relative thermal indices (RTI) up to 180°C

Strength and Stiffness: Outstanding strength and amorphous thermoplastic among the available alternatives, with predictable stiffness and strength up to 200°C. unfilled, transparent grades are equal in strength to other thermoplastics with opacifying fillers.

Dimensional Stability: Among the most dimensionally stable thermoplastics available, offering predictability over a wide temperature range. filled grades offer exceptionally high-tolerance dimensional capabilities.

Environmental Stress & Cracking Resistance: Unlike most other amorphous thermoplastics, ultem resins retain strength and resist stress cracking when exposed to automotive and aircraft fluids, aliphatic hydrocarbons, alcohols, acids, and weak aqueous solutions.

Flammability, Smoke Generation and Toxicity: Inherent flame resistance without additives in most grades - exceptionally difficult to ignite, with a limiting oxygen index (LOI) of 47%, meeting ul94 v0 specifications in sections as thin as 0.41 mm. generates extremely low smoke per the nbs smoke evolution test, with products of combustion no more toxic than those of wood.

This material data has been provided by M-Base.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

Property	Value
Density	1.27 - 1.3 g/cm³ Show Material materials with Density of 1.27 - 1.3 g/cm³

Mechanical

Property	Value	Comment
Elastic modulus	2.9 - 3.3 GPa Show Material materials with Elastic modulus of 2.9 - 3.3 GPa
Elongation	60.0 - 100.0 % Show Material materials with Elongation of 60.0 - 100.0 %
Impact strength, Charpy notched	3.0 - 4.0 kJ/m² Show Material materials with Impact strength, Charpy notched of 3.0 - 4.0 kJ/m²
Impact strength, Charpy unnotched	110 kJ/m² Show Material materials with Impact strength, Charpy unnotched of 110 kJ/m²
Tensile strength	85.0 - 110.0 MPa Show Material materials with Tensile strength of 85.0 - 110.0 MPa	at 6-10% strain

Thermal

Property	Value
Coefficient of thermal expansion	5.5e-05 - 6e-05 1/K Show Material materials with Coefficient of thermal expansion of 5.5e-05 - 6e-05 1/K
Specific heat capacity	1200 J/(kg·K) Show Material materials with Specific heat capacity of 1200 J/(kg·K)
Thermal conductivity	0.22 W/(m·K) Show Material materials with Thermal conductivity of 0.22 W/(m·K)
Flammability	UL 94 V0

Electrical

Property	Value
Dielectric constant	3.2 [-] Show Material materials with Dielectric constant of 3.2 [-]
	3.5 [-] Show Material materials with Dielectric constant of 3.5 [-]
Electrical resistivity	10000000000000.0 - 1000000000000000.0 Ω·m Show Material materials with Electrical resistivity of 10000000000000.0 - 1000000000000000.0 Ω·m

Optical

Property	Value
Transparency	yes

Technological properties

Property

Application areas

High voltage breaker housings, multi-way connectors, parts for microwaves, parts for break cylinders, carburetor housings, sterilization containers

Processing methods

Injection molding

Polyetherimide (PEI)

Description

Ashby charts

Applications

Suggested reading

Properties