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Polystyrene 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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( see also Rex-O-Lite Cross-Linked Polystyrene Specifications )

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Polystyrene (PS) is a thermoplastic that is 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.

Polystyrenes are usually processed by injection molding, but due to the material's excellent processability, other methods work equally well, including blow and vacuum molding, thermoforming, extrusion or compression molding, and machining. PS grades are resistant to a wide variety of chemicals: alkalies, salts, lower alcohols, and weak acids. Polystyrenes also comply with FDA regulations.

• Co-axial cable separators • Handles • Tubing for corrosive liquids • Splash shields • Standoffs • Studs • Lighting diffusers • Tank covers • Insulators • Sign panels • Knobs & buttons • Profiles • Containers • Trays • Refrigerator door linings • Packaging applications

General Purpose Polystyrene (GPPS)
GPPS has excellent transparency, good water resistance, and a high dielectric strength. It is widely used for laminated electronic circuits, high frequency insulation sheeting, insulators and other electrical applications.

High Impact Polystyrene (HIPS)
HIPS has good dimensional strength, balanced properties of impact strength and heat resistance, is easily machined, and is relatively low cost. Because of its good impact strength at low temperatures, it is typically used for home appliances, toys, and electrical components.
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ASTM or UL test Property GP-PS HI-PS
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.06 0.01
D638 Tensile Strength (psi) 7,500 4,000
D638 Tensile Modulus (psi) 450,000 260,000
D638 Tensile Elongation at Break (%) 47 55
D790 Flexural Strength (psi) 6,100 8,700
D790 Flexural Modulus (psi) 475,000 280,000
D695 Compressive Strength (psi) 14,500 7,500
D785 Hardness, Rockwell 75M 56L
D256 IZOD Impact Notched (ft-lb/in) 0.8 2
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
4.0 4.2
D648 Heat Deflection Temp (°F / °C)
at 264 psi

200 / 95

195 / 92
D3418 Vicat Softening Temp (°F / °C) 224 / 107 214 / 102
- Max Operating Temp (°F / °C) 150 / 65 140 / 60
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)


UL94 Flammability Rating H-B H-B
D149 Dielectric Strength (V/mil) short time, 1/8" thick 60 45
D149 Dielectric Constant at 1MHz 2.5 2.7
D495 Arc Resistance (sec) 70 100
D257 Volume Resistivity (ohm-cm)at 50% RH >1016 >1016

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.

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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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