Polystyrene (PS)

Product Overview

Polystyrene (PS) is a thermoplastic resin within our organic chemicals range. It is used in packaging, consumer goods, appliance components and selected laboratory products.

Its performance depends on the resin type and grade. GPPS is selected where clarity and rigidity are important, while HIPS offers improved impact resistance through rubber modification.

Commercial resin pellets should be distinguished from expandable beads and finished foam products.

Chemical Identification

GPPS and HIPS: Key Differences

Check the actual grade data rather than selecting solely by the GPPS or HIPS designation.

Key Properties and Grade Selection

Depending on the grade, PS resins can provide:

• Rigidity and dimensional stability.

• Clarity and surface gloss, particularly in GPPS.

• Improved impact resistance in HIPS.

• Low water absorption.

• Suitability for injection molding, extrusion and sheet thermoforming.

Before ordering, compare:

• Melt flow rate and its test temperature and load.

• Impact strength and test method.

• Vicat softening temperature or other relevant heat-performance data.

• Clarity, color and surface-finish requirements.

• Virgin or recycled content, where relevant.

Typical Applications

Packaging

• Rigid packaging, trays and thermoformed containers.

• Transparent packaging components made from suitable GPPS grades.

• Food-contact packaging where the particular grade and finished article meet the intended-use requirements.

Consumer Products

• Household articles, stationery and display components.

• Transparent cases and other rigid molded parts.

• Products requiring a balance of appearance, stiffness and processing performance.

Electronics and Appliances

• Selected appliance housings and internal components.

• Refrigerator parts and other molded or thermoformed components.

• Applications requiring evaluation of impact strength, heat performance and any specified fire classification.

Construction and Foam Materials

• Suitable PS grades can be used in XPS foam-production processes.

• EPS products are made from expandable polystyrene beads using dedicated expansion and molding processes.

• Insulation performance and fire classification apply to the finished foam system, not automatically to ordinary PS pellets.

Medical and Laboratory Products

• Selected grades are used in laboratory dishes, tubes and diagnostic components.

• Suitability depends on the application, manufacturing process and supporting documentation.

• Sterilization compatibility and finished-product requirements must be evaluated separately.

Processing Methods

Main processing methods include:

• Injection molding.

• Sheet and profile extrusion.

• Thermoforming of suitable extruded sheet.

• Specialized foaming processes using appropriate materials and equipment.

Use the resin manufacturer’s processing guidance for the selected grade. Melt temperature, residence time, cooling and drying requirements depend on the material and process.

Packaging and Storage

Packaging

• Confirm bag type, net weight and pallet arrangement when requesting a quotation.

• Specify the required resin grade and product identification.

• Confirm whether virgin or recycled material is required.

Storage

• Keep packaging closed in a dry, covered storage area.

• Protect pellets from contamination and prolonged sunlight exposure.

• Keep away from heat, ignition sources and strong oxidizing agents.

• Follow the supplied grade’s storage recommendations.

Handling

• Collect spilled pellets promptly to prevent slipping and environmental release.

• Provide suitable ventilation during melt processing.

• Consult the current SDS for handling and processing precautions.

Frequently Asked Questions

What Is the Difference Between GPPS and HIPS?

GPPS generally provides greater clarity and rigidity. HIPS is rubber-modified to improve impact resistance and is usually opaque. The best choice depends on the finished product and processing requirements.

Is Ordinary PS Resin the Same as EPS Foam?

No. Ordinary PS resin pellets, expandable EPS beads and finished foam products are different supply forms. Their processing routes and specifications should be confirmed separately.

Is Polystyrene Suitable for Food Contact?

Suitable grades are used in food packaging. Request the relevant grade-specific declaration and confirm suitability for the intended food, contact temperature, duration and destination market.

Is Polystyrene Recyclable?

PS can be recycled where suitable collection and processing facilities exist. Practical recyclability depends on the product form, contamination, sorting and local infrastructure.

What Information Is Needed for a Quotation?

Provide the required grade or target properties, application, processing method, quantity, packaging and destination. Specify any food-contact, laboratory or other documentation requirements.

Why Choose Aozun Chemical?

Aozun Chemical supports industrial material sourcing and export enquiries.

• Grade and specification matching.

• Product-document confirmation.

• Packaging and shipment coordination.

• Bulk quotation support based on order requirements.

Contact Us

For polystyrene resin specifications and pricing, contact our sales team with your required grade, application, processing method, quantity and destination.

Email: lisa@aozunchem.com
WeChat / WhatsApp: +86 186 5121 5887