Polystyrene (PS) CAS 9003-53-6 is a versatile, high-performance thermoplastic polymer produced from styrene monomers. It is one of the most widely used plastics globally due to its excellent clarity, rigidity, lightweight nature, and cost-effectiveness.

Key Properties of Polystyrene (PS)

  • Chemical Formula: (C₈H₈)n
  • CAS Number: 9003-53-6
  • Appearance: Naturally transparent (general-purpose PS) or white/opaque in foamed forms; can be easily colored
  • Density: 0.96–1.06 g/cm³
  • Glass Transition Temperature (Tg): Approximately 100°C
  • Melting Point: Around 212–240°C (depending on grade)
  • Refractive Index: ~1.59
  • Water Solubility: Insoluble
  • Other Characteristics: Good electrical insulation, moderate chemical resistance, brittle in solid form, excellent processability via injection molding, extrusion, and thermoforming

Polystyrene offers a balanced combination of stiffness, dimensional stability, and ease of fabrication, making it ideal for both solid (crystal) and expanded/foamed applications.

Main Types of Polystyrene

  • General Purpose Polystyrene (GPPS): Crystal-clear, hard, and rigid — perfect for products requiring transparency and aesthetics.
  • High Impact Polystyrene (HIPS): Modified with rubber for improved toughness and impact resistance.
  • Expanded Polystyrene (EPS): Lightweight foam with superior thermal insulation and shock absorption.

Common Applications-Polystyrene(PS)

Polystyrene (PS) is extensively used across multiple industries:

  • Packaging: Protective packaging for electronics, appliances, and fragile items; food service containers, disposable cups, plates, clamshells, and insulated food boxes.
  • Insulation: Building insulation boards, wall panels, roofing systems, and coolers for thermal efficiency and energy savings.
  • Consumer Goods: Disposable cutlery, CD/DVD cases, plastic models, toys, household items, and stationery products.
  • Medical & Lab: Petri dishes, test tubes, and other disposable labware due to clarity and sterility compatibility.
  • Other Uses: Automotive components, appliance housings, signage, and point-of-purchase displays.

Its lightweight design reduces shipping costs, while its moldability supports high-volume production with fine detail.

Why Choose Our Polystyrene (PS)?

  • Consistent quality and reliable supply
  • Competitive pricing for bulk orders
  • Suitable for food-contact, industrial, and specialty grades (custom formulations available)
  • Excellent machinability and compatibility with additives, colorants, and flame retardants

Frequently Asked Questions (FAQs)-Polystyrene(PS)

What is the difference between GPPS and HIPS?

GPPS provides high clarity and gloss but is more brittle, while HIPS includes impact modifiers for better durability in applications requiring toughness.

Is Polystyrene (PS) recyclable?

Yes, solid PS (like GPPS and HIPS) is recyclable where facilities exist. Expanded PS (EPS) is also recyclable in specialized programs and can be densified for reprocessing.

Is Polystyrene food-safe?

Food-grade Polystyrene meets relevant regulations for applications like disposable tableware, cups, and packaging when produced to appropriate standards.

What solvents dissolve Polystyrene?

PS is soluble in solvents such as chloroform, benzene, toluene, ethyl acetate, and THF, but insoluble in water and alcohols.

How should Polystyrene be stored?

Store in a cool, dry place (ideally 2-8°C for some grades) away from strong oxidizers and direct sunlight to maintain quality.

Can Polystyrene be used for high-temperature applications?

Standard PS has limited heat resistance (softens near 100°C). For higher temperatures, consider specialty heat-resistant grades or alternative polymers.

What is the environmental impact of Polystyrene?

PS is lightweight and energy-efficient in production and use (especially for insulation), helping reduce overall carbon footprint in applications like packaging and construction.

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