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Grade: Ultem® 1000-7107
Formula: PEI
Form: Rod
Material: Polyetherimide (PEI)
CAS Number: 61128-46-9
Commodity: Polymers
Diameter: 12.3mm
Ultem® 1000‑7107 PEI Rod turns that resin into a clean, machinable stock shape for quick, precise insulating parts in warm, electrically sensitive equipment. It holds threads and edges with minimal burring, supports close tolerances after drilling and tapping, and maintains a smooth surface that seals well against gaskets and O‑rings. Engineers use it for standoffs, manifolds, spacers, and housings near heaters, lamps, and power electronics where mold tooling is not justified. The material’s inherent flame performance and high limiting oxygen index add safety margin in crowded enclosures, while its dimensional stability helps assemblies survive repeated maintenance and bakeouts. Rod stock is well suited to short runs, jigs, and late‑stage changes, letting teams iterate geometry without changing materials between prototype and production. It bonds, labels, and fastens cleanly, and its low outgassing supports sensitive optical or analytical systems. For development and production, Ultem 1000‑7107 provides a straightforward path to lightweight, rigid, electrically quiet components that deliver long service with little upkeep.
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Tolerances

Rod
Diameter +20% / -10%

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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