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Grade: Ultem® 1000
Formula: PEI
Form: Granule
Material: Polyetherimide (PEI)
CAS Number: 61128-46-9
Commodity: Polymers
Nominal Granule Size: 3mm
Color: Natural
Ultem® 1000 PEI Granules are a high-temperature, flame-resistant resin chosen when parts must remain stiff, electrically insulating, and dimensionally steady in hot, chemically active environments. Designers rely on it for connectors, coil forms, sensor and lighting housings, valves and manifolds, and thin-wall structures that face repeated thermal cycling. The material molds into crisp ribs, threads, and snap-fits, supports ultrasonic or solvent joining, and accepts press-fit hardware without cracking, which shortens assembly and reduces secondary work. Aerospace interiors, medical equipment (non-implant), and industrial electronics use it to replace heavier metals while meeting strict flammability and low-outgassing expectations. Its clean surface and stable color help with marking, labeling, and visual inspection in the field. In development and production, teams appreciate a predictable processing window and the ability to consolidate parts without sacrificing reliability. Ultem 1000 provides a proven platform for durable, lightweight components that hold their shape and function near heat sources.
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Material Properties for Polymers

Chemical Resistance
Element Value
Acids - concentrated Good(-Fair?)
Acids - dilute Good
Alcohols Good
Alkalis Good-Poor
Aromatic hydrocarbons Poor
Greases and Oils Good
Halogenated Hydrocarbons Good-Poor
Ketones Poor
Electrical Properties
Element Value
Dielectric constant @1kHz 3.1
Dissipation factor @ 1MHz 0.0013@1
Dielectric strength( kV mm⁻¹ ) 30@1.6mm
Surface resistivity( Ohm/sq ) 4.10¹³
Volume resistivity( Ohmcm ) 7.10¹⁵
Physical Properties
Element Value
Flammability V-0 @ 0.4mm
Radiation resistance Good
Resistance to Ultra-violet Good/Fair
Limiting oxygen index( % ) 47
Water absorption - equilibrium( % ) 1.3
Water absorption - over 24 hours( % ) 0.25
Density( gcm⁻³ ) 1.27
Mechanical Properties
Element Value
Hardness - Rockwell R125
Poisson's ratio 0.44
Elongation at break( % ) 60
Compressive modulus( GPa ) 2.9
Tensile modulus( GPa ) 2.9
Izod impact strength( J m⁻¹ ) 50
Abrasive resistance - ASTM D1044( mg/1000 cycles ) 10
Tensile strength( MPa ) 85
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 200
Heat-deflection temperature - 1.8MPa( C ) 190
Upper working temperature( C ) 170-200
Specific heat( J K⁻¹ kg⁻¹ ) 2000
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.22@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 56
Pultrusions
Element Value
Compressive strength( MPa ) 140

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