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Diamond GP-525

Sold by PAK Petrochemical Industries
Polymer Name: General Purpose Polystyrene (GPPS)
Processing Methods: Injection Molding
Melt Flow Index: 7.0 g/10 min
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Identification & Functionality

Chemical Family
Plastics & Elastomers Functions

Diamond GP-525 Features & Benefits

  • Blue tinted,
  • Excellent Clarity,
  • Good Flow, Low Volatility
  • (Below 1000 ppm)

Applications & Uses


House ware, Containers, Plastic refrigerator parts, Toys and Lampshield, Drinking cups, Audio & Video cassette, Stationery items, CD casing, Plastic hangers and Cosmetic casings.


  • Injection Molding

Although Polystyrene GP-525 can be processed by any method applicable to polystyrene based plastic, it is best suitable for injection molding and extrusion molding. The melt temperatures should not exceed 260 °C .


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Specific Gravity (23°C)1.05--
Tensile Strength at Yield / at break410kgf/cm2ASTM D-638
Tensile Elongation1.2%ASTM D-638
Flexural Strength750kgf/cmASTM D-790
Vicat Softening Temp960CASTM D-1525
Heat Distortion Temp850CASTM D-648
Melt Flow Rate MFR 200/57gm/10 minASTM D-1238

Regulatory & Compliance

Certifications & Compliance
Food Legislation

If used unmodified and under appropriated processing conditions, Polystyrene GP-525 conforms with FDA title 21 CFR section 177.1640 regarding the use of in food contact articles. Diamond Polystyrene is also approved by PCSIR (Pakistan Council of Scientific & Industrial Research).

Safety & Health

Product Safety

During processing of Polystyrene GP-525, small quantity of Styrene Monomer may be released into the atmosphere. At styrene vapor concentrations below 20 ppm, no negative health effects are expected. In our experience, the concentration of styrene does not exceed 1 ppm in good ventilate workplace.


Diamond polystyrene resins can be recycled. Adequate ventilation should be used during processing. Diamond Polystyrene must not be dispose of to landfill or incineration as per government laws and regulations.

Packaging & Availability

Country Availability

Regional Availability

Storage & Handling

Form supplied & Storage

Polystyrene GP-525 is supplied as cylindrical shaped granules. It has to be kept in its original containers in a dry, cool place. Avoid direct exposure to sunlight. PS GP-525 can also be stored in silos.

Diamond GP-525
PAK Petrochemical Industries