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Semitron® ESd 490HR
High-Resistivity Static Dissipative PEEK Specifications

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


BPI Home Page | Applications | Materials Guide | Contact Us!
Semitron Family Overview | Semitron ESd 225 | Semitron ESd 410C | Semitron ESd 420
Semitron ESd 480 | Semitron ESd 490HR | Semitron ESd 500HR | Semitron ESd 520HR
Semitron MDS 100 | Semitron MP 370 | Semitron CMP LL5 | Semitron CMP XL25 | Semitron MPR 1000

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click to resize photo Semitron ® ESd 490HR is a static dissipative reinforced PolyEtherEtherKetone (PEEK). This material has similar general properties as Semitron ® ESd 480, but a higher resistivity value, in the range of 109 to 1011. It is thermally stable to temperatures of 490°F (270°C) without degradation and offers high structural strength and stiffness combined with excellent dimensional stability.

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

Semitron ® ESd 490HR is also non-sloughing to minimize contamination due to wear so it is ideal for making nests, sockets and contactors for test equipment and other electronic device handling components. While typical carbon-fiber-enhanced products become irreversibly more conductive when exposed to moderate voltage, Semitron ® ESd 490HR maintains its dielectric performance while maintaining its mechanical properties.

In addition, Semitron ® ESd 490HR exhibits the excellent chemical resistance properties of standard PEEK, including resistance to weak acids, all alkalies, aliphatic and aromatic hydrocarbons, ketones, esters, chlorinated solvents, alcohols, and inorganic salt solutions (all at 73F). Semitron ® ESd 490HR is not resistant to concentrated acids.
( see also Semitron ESd 480 | standard PEEK )

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 490HR
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.18
D570 Water Absorption, Saturation (%) 1.65
D638 Tensile Strength, Ultimate (psi) 14,000
D638 Tensile Modulus (psi) 940,000
D638 Tensile Elongation at Break (%) 2.3
D790 Flexural Strength (psi) 21,000
D790 Flexural Modulus (psi) 950,000
D695 Compressive Strength (psi) 26,000
D695 Compressive Modulus (psi) 600,000
D785 Hardness, Rockwell R123 / M105
D256 IZOD Notched Impact (ft-lb/in) 1.0
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
D648 Heat Deflection Temp (°F / °C)
at 264 psi

500 / 260
- Max Operating Temp (°F / °C) 475 / 246
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)

UL94 Flammability Rating V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick -
D150 Dielectric Constant at 1 MHz 5.33
D150 Dissipation Factor at 1 MHz 0.227
EOS/ESD S11.11 Surface Resistivity (ohms/square) 109 - 1011
Mil-B-81705C Max Static Decay (seconds) < 2

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.
PEEK is a registered trademark of Victrex plc.
SEMITRON is a registered trademark of Quadrant Engineering Plastic Products.

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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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