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Polystyrene (PS) is a thermoplastic designed for applications requiring excellent electrical and mechanical properties together with good processability. Polystyrenes have well-balanced physical properties and are generally transparent, but available in various colors.

Cross-linked polystyrene copolymer is a rigid, transparent, and colorless material with outstanding electrical properties, including low dielectric losses up to very high frequencies, and very high radiation resistance. Compared to normal polystyrene, it is harder and somewhat more temperature resistant. Cross-linked polystyrene has good dimensional stability, can be easily machined, and polishes to a high optical quality.

Rexolite® brand is a cross-linked polystyrene, microwave plastic. It’s most notable properties are unusually stable electrical properties into the giga-hertz frequency range. It is also optically clear (approximately the same as acrylic), dimensionally stable, and possesses excellent sound transmission characteristics. Grades include glass. Rexolite® may be ordered in sheet thicknesses to 1/4″ with copper-clad surface in thicknesses ranging from 1/2-ounce to 2-ounce copper.

Brand Names

  • Rexolite® 1422
  • Rexolite® 2200

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative with the form below.

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At a Glance

Generic Name
Polystyrene, Crosslinked, Unfilled

Available In
Sheet, Rod

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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

Sheet 1/4″ – 1-1/2″ TH 24″ x 48″; CTS Translucent
Rod 1″ – 8″ DIA 8’ long; CTS Translucent

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.038
Water Absorption, 24 hrs % D570 0.0008
Mechanical PropertiesUnitsASTMResults
Tensile Strength psi D638 7,980 – 10,200
Tensile Modulus psi D638 239000
Tensile Elongation @Break % D638 3 – 5
Flexural Strength psi D790 11500
Hardness, Rockwell R D785 R110 – 120
IZOD Impact Strength Notched ft-lb/in D256 0.3
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10⁻⁵in./in./°F) D256 3.8
Max Operating Temp °F D648 -76 to +212
Thermal Conductivity BTU-in/ft²-hr-°F C177 1.01
Electrical PropertiesUnitsASTMResults
Dielectric Strength @1/8″ th. V/mil D149 500
Dielectric Constant, 1 MHz to 500 GHz D150 0.00025
Surface Resistivity @ 60 Hz ohms/sq D257 >10¹⁴
Volume Resistivity, 50% RH ohm-cm D257 >10¹⁶
Optical PropertiesUnitsASTMResults
Refractive Index. @486 nM % 1.604
Acoustic Impedance 2.5
Velocity of Sound in/sec 93000

NOTE: The property values presented above 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.


  • High frequency circuit substrates
  • Microwave components
  • Lenses with acoustic, optical and radio-frequency applications
  • Observation windows
  • Missile guidance system housings
  • Electronic circuits


  • Outstanding dielectric properties
  • High-voltage resistance
  • Radiation resistant
  • High dimensional stability
  • Very low water absorption
  • Excellent chemical resistance


  • High Impact Strength
  • High Impact Strength, Conductive
  • Crosslinked, Copper clad
  • Crosslinked, Glass filled
  • Crosslinked, Unfilled

NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call 973-862-4148.

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