Polystyrene Granules

Polystyrene Granules are raw feedstock pellets of polystyrene (PS), an amorphous thermoplastic known for rigidity, ease of molding, and excellent optical clarity. The granulated form provides versatility for injection molding, extrusion, and thermoforming in diverse industrial contexts. Industries including packaging, consumer products, and laboratory equipment manufacturing rely on polystyrene granules for scalable production of transparent or opaque components. Specific applications include disposable laboratory petri dishes, transparent packaging containers, and prototyping components in research environments. In scientific contexts, Polystyrene granules are also studied as a model polymer system for thermal processing, chain entanglement dynamics, and the effects of additives on mechanical properties. Their consistent processability, low density, and balance of rigidity with optical clarity ensure Polystyrene granules remain central to polymer research and industrial-scale plastic production.

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Properties

Reference & Citations

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Material Properties for Polymers

Physical Properties

Element	Value
Abbe number	30.8
Flammability	HB
Radiation resistance	Good
Refractive index	1.59-1.6
Resistance to Ultra-violet	Poor
Limiting oxygen index( % )	19
Water absorption - over 24 hours( % )	0.4
Density( gcm⁻³ )	1.05

Chemical Resistance

Element	Value
Acids - concentrated	Fair-Poor
Acids - dilute	Good-Fair
Alcohols	Good-Fair
Alkalis	Good-Fair
Aromatic hydrocarbons	Poor
Greases and Oils	Good-Poor
Halogenated Hydrocarbons	Poor
Halogens	Poor
Ketones	Poor

Electrical Properties

Element	Value
Dielectric constant @1MHz	2.4-3.1
Dissipation factor @ 1kHz	0.0002
Dielectric strength( kV mm⁻¹ )	20
Volume resistivity( Ohmcm )	>10¹⁶

Mechanical Properties

Element	Value
Hardness - Rockwell	M60-90
Poisson's ratio	0.35
Elongation at break( % )	1.6
Tensile modulus( GPa )	2.3-4.1
Izod impact strength( J m⁻¹ )	19-24
Tensile strength( MPa )	30-100

Thermal Properties

Element	Value
Heat-deflection temperature - 0.45MPa( C )	90
Heat-deflection temperature - 1.8MPa( C )	80
Upper working temperature( C )	50-95
Specific heat( J K⁻¹ kg⁻¹ )	1200
Thermal conductivity( W m⁻¹ K⁻¹ )	0.1-0.13@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	30-210