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Semitron® ESd 420
Static-Dissipative PEI Specifications

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:


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click to resize photo Semitron® ESd 420 is a static dissipative PolyEtherImide. This material has the same general properties as PEI but with static dissipative properties throughout -- resistivity in the range of 106 to 109. It is thermally stable to temperatures of 420°F (215°C) without degradation.

This material is available in sheet and rod forms and is  BLACK  in color.

The standard Semitron ESd 420 standard grade of material is suitable for most environments. A second grade, designated Semitron ESd 420V, has been developed for those applications where higher strength, stiffness, and dimensional stability is required, especially very precise or fine-pitch machined parts applications. See the properties table below for comparison.

( see also standard Ultem PEI, Semitron ESd 410C, and Tempalux Conductive PEI Specifications )

Semitron® ESd is a family of static dissipative products designed for use where electrical discharge in operation is a problem. They are commonly used for sensitive electronic components including integrated circuits, hard disk drives, and circuit boards. Semitron® products are also an excellent choice for material handling applications, and components in high speed electronic printing and reproducing equipment.

Semitron® ESd products are inherently dissipative. They do not rely on atmospheric phenomena (humidity) to activate, nor are surface treatments used to achieve dissipation. Static electicity is dissipated through these products as readily as it is dissipated along the surface.

See other available Semitron® ESd Family grades:
Semitron ESd 225 | Semitron ESd 410C | Semitron ESd 420 | Semitron ESd 480 | Semitron ESd 490HR | Semitron ESd 500HR | Semitron ESd 520HR

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ASTM or UL test Property Semitron® ESd 420 Semitron® ESd 420V
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.5 0.21
D570 Water Absorption, Saturation (%) 2.9 1.4
D638 Tensile Strength, Ultimate (psi) 11,500 10,000
D638 Tensile Modulus (psi) 640,000 910,000
D638 Tensile Elongation at Break (%) 2 1.5
D790 Flexural Strength, Yield (psi) 14,500 15,800
D790 Flexural Modulus (psi) 650,000 910,000
D695 Compressive Strength (psi) 23,800 22,300
D695 Compressive Modulus (psi) 370,000 545,000
D785 Hardness, Rockwell M118 M110
D256 IZOD Notched Impact (ft-lb/in) 1.0 0.5
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
1.9 1.5
D648 Heat Deflection Temp (°F / °C)
at 264 psi

410 / 210

420 / 216
D3418 Glass Transition Temp (°F / °C)
410 / 210

420 / 216
- Max Operating Temp (°F / °C) 340 / 171 340 / 171
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)


UL94 Flammability Rating V-0 V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick - -
D150 Dielectric Constant at 1 MHz - -
D150 Dissipation Factor at 1 MHz - -
EOS/ESD S11.11 Surface Resistivity (ohms/square) 106 - 109 106 - 109

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets.
All values at 73°F (23°C) unless otherwise noted.
SEMITRON is a registered trademark of Quadrant Engineering Plastic Products.
ULTEM is a registered trademark of SABIC Innovative Polmers (formerly GE Plastics)

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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:

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