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Polystyrene Specifications
- Jun 10, 2017 -

DESCRIPTION

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.



TYPICAL APPLICATIONS

• 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



POLYSTYRENE GRADES 

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.


TYPICAL PROPERTIES of POLYSTYRENE 
ASTM or UL testPropertyGP-PSHI-PS
PHYSICAL


D792Density (lb/in³)
(g/cm³)
0.043
1.05
0.043
1.04
D570Water Absorption, 24 hrs (%)0.060.01
MECHANICAL


D638Tensile Strength (psi)7,5004,000
D638Tensile Modulus (psi)450,000260,000
D638Tensile Elongation at Break (%)4755
D790Flexural Strength (psi)6,1008,700
D790Flexural Modulus (psi)475,000280,000
D695Compressive Strength (psi)14,5007,500
D785Hardness, Rockwell75M56L
D256IZOD Impact Notched (ft-lb/in)0.82
THERMAL


D696Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
4.04.2
D648Heat Deflection Temp (°F / °C)
at 264 psi

200 / 95

195 / 92
D3418Vicat Softening Temp (°F / °C)224 / 107214 / 102
-Max Operating Temp (°F / °C)150 / 65140 / 60
C177Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

-
-

-
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UL94Flammability RatingH-BH-B
ELECTRICAL


D149Dielectric Strength (V/mil) short time, 1/8" thick6045
D149Dielectric Constant at 1MHz2.52.7
D495Arc Resistance (sec)70100
D257Volume 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.