gp-polystyrene

General Purpose Polystyrene is a versatile resin with unique properties, available in various grades to meet diverse production needs:

Polystyrene GP-14N:
This high molecular weight polystyrene offers excellent heat resistance and good melt strength, making it an ideal choice for sheet and foam extrusion applications. GP-14N provides optimal mechanical strength and outstanding thermal properties, making it suitable for food trays, extruded and embossed sheets, heat-resistant thermoformed products, as well as XPS insulation boards and XPS food packaging.

Polystyrene GP-24N:
With a medium molecular weight and similar properties to GP-14N, this grade is also designed for sheet and foam extrusion. GP-24N offers excellent heat resistance and melt strength, making it perfect for producing food trays, extruded and embossed sheets, heat-resistant thermoformed products, XPS insulation boards, and XPS food packaging.

Polystyrene GP-32N:
This grade is a general-purpose polystyrene resin with easy flow and good clarity, suitable for applications requiring a balance between flow and strength. In injection molding, GP-32N exhibits low viscosity at high shear rates, making it particularly suitable for glossy-layer coextrusion applications.

With a variety of GP polystyrene grades available, manufacturers can address specific production requirements and deliver high-quality, optimized products.

GPPS Gp-14N

GPPS Gp-24N

GPPS Gp-32N

GP-14N: High Molecular Weight Polystyrene

Technical Specifications

Property

Unit

Test Method

Value

Rheological




Melt Flow Index (200 °C - 5 kg)

GR/10MIN

ASTM D-1238

3

Thermal




VICAT Softening Point (10N)

°C

ASTM D-1525

103

Heat Distortion Temperature (0.45 Mpa)

°C

ASTM D-648

95

Mechanical




Notched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

1.5

Unnotched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

10

Tensile Strength at Break

MPa

ASTM D-638

45

Elongation at Break

%

ASTM D-638

2.5

Tensile Modulus

MPa

ASTM D-638

3100

Miscellaneous




Water Absorption

%

ASTM D-570

≥0.09

Moulding Shrinkage

%

ASTM D-955

0.4-0.8

Density

g/cm³

ASTM D-792

1.04


Recommended Injection Molding Parameters

Parameter

Unit

Value

Barrel Temperature Zone 1

°C

170 - 180

Barrel Temperature Zone 2

°C

180 - 220

Barrel Temperature Zone 3

°C

210 - 260

Barrel Temperature Zone 4

°C

210 - 260

Nozzle
°C
210 - 260

Mold

°C

40 - 60


Features and Applications

Features:

  1. High molecular weight
  2. Heat resistance
  3. Good melt strength
  4. Optimal mechanical and thermal properties

Applications:

  1. Extrusion sheets
  2. Foam extrusion
  3. Profile, extrusion, and embossed sheets
  4. Heat-resistant thermoformed products
  5. XPS insulation boards
  6. XPS food packaging
  7. Food trays

GP-24N: Medium Molecular Weight Polystyrene

Technical Specifications (No Minral oil)

Property

Unit

Test Method

Value

Rheological




Melt Flow Index (200 °C - 5 kg)

GR/10MIN

ASTM D-1238

3-5

Thermal




VICAT Softening Point (10N)

°C

ASTM D-1525

102

Heat Distortion Temperature (0.45 Mpa)

°C

ASTM D-648

94

Mechanical




Notched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

1.3

Unnotched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

8

Tensile Strength at Break

MPa

ASTM D-638

42

Elongation at Break

%

ASTM D-638

2

Tensile Modulus

MPa

ASTM D-638

3000

Miscellaneous




Water Absorption

%

ASTM D-570

≥0.09

Moulding Shrinkage

%

ASTM D-955

0.4-0.8

Density

g/cm³

ASTM D-792

1.04


Recommended Injection Molding Parameters

Barrel Temperature

Unit

Value

Barrel Temperature Zone 1

°C

170 - 180

Barrel Temperature Zone 2

°C

180 - 220

Barrel Temperature Zone 3

°C

210 - 250

Barrel Temperature Zone 4

°C

210 - 250

Nozzle
°C210 - 250

Mold

°C

40 - 60


Features and Applications

Features:

  1. High molecular weight
  2. Heat resistance
  3. Good melt strength
  4. Optimal mechanical and thermal properties

Applications:

  1. Extrusion sheets
  2. Foam extrusion
  3. Profile, extrusion, and embossed sheets
  4. Heat-resistant thermoformed products
  5. XPS insulation boards
  6. XPS food packaging
  7. Food trays

GP-32N: Medium Molecular Weight Polystyrene

Technical Specifications (minral oil)

Property

Unit

Test Method

Value

Rheological




Melt Flow Index (200 °C - 5 kg)

GR/10MIN

ASTM D-1238

10

Thermal




VICAT Softening Point (10N)

°C

ASTM D-1525

95





Mechanical




Notched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

1.5

Unnotched IZOD Impact Strength (23°C)

KJ/M²

ASTM D-256

8

Tensile Strength at Break

MPa

ASTM D-638

42

Elongation at Break

%

ASTM D-638

2.5

Tensile Modulus

MPa

ASTM D-638

2900

Miscellaneous




Water Absorption

%

ASTM D-570

≥0.09

Moulding Shrinkage

%

ASTM D-955

0.4-0.8

Density

g/cm³

ASTM D-792

1.04


Recommended Injection Molding Parameters

Barrel Temperature

Unit

Value

Barrel Temperature Zone 1

°C

150- 180

Barrel Temperature Zone 2

°C

160-200

Barrel Temperature Zone 3

°C

210 -240

Barrel Temperature Zone 4

°C

210 - 250

Nozzle 

°C

210-250

Mold
°C40-60


Features and Applications

Features:

  1. High molecular weight
  2. Heat resistance
  3. Good melt strength
  4. Optimal mechanical and thermal properties

Applications:

  1. Injection molding
  2. Disposable cups
  3. Blending with HIPS
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