Polystyrene Injection Molding

Polystyrene Injection Molding Services

Polystyrene Injection Molding

NDDMold, polystyrene injection molding is a flexible and effective manufacturing method that enables the production of high-quality substances with great dimensional precision and surface consistency. With our state-of-the-art technology, adaptability, accuracy, and commitment to sustainability, we provide a relationship that goes beyond simple manufacturing and ensures your success.

For polystyrene injection molding, you can trust our expertise and commitment to excellence. From the design consultation to the manufacturing and beyond, our devoted team is here to help you at every step of the way.

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Why Polystyrene is Best for Injection Molding?

Low Melting Point
Low Melting Point
Fast Cycle Time
Fast Cycle Time
Good Flow Properties
Good Flow Properties
Good Dimensional Stability
Good Dimensional Stability
Excellent Insulation Properties
Excellent Insulation Properties

Polystyrene Injection Molding Benefits

Chemical resistance

Polystyrene is chemically resistant to a wide range of substances, including acids, alkalis, and solvents.

Surface finish that is smooth

Parts with a smooth and uniform surfaces finish are produced using polystyrene injection molding.

Recycling and environmental sustainability

This increases sustainability and decreases production’s environmental impact. Furthermore, the lightweight nature of polystyrene leads to decreased transportation costs and lower carbon emissions.

High productivity

Injection molding is a high-efficiency mass-production process.

Repeatability and precision

Because of its great precision and reproducibility, the injection molding method is suitable for manufacturing parts with precise details and tight tolerances.

Unreinforced PS Impact Modified PS Transparent PS Heat-Resistant PS
Physical (g/cm3) Density 0.857 1.05 1.04 1.05
(cm/cm) Linear Mold Shrinkage Rate 0.00509 0.0060 0.00539 0.00557
® Rockwell Hardness 100 94.8 121 105
Mechanical (MPa) Tensile Strength at Yield 43.7 25.9 43.6 45.9
 (%) Elongation at break 25.8 44.8 3.14 9.74
(GPa) Flexural Modulus 3.47 2.14 3.11 2.99
(MPa) Flexural Yield-Strength 69.2 54 76.2 82
Injection Molding (°C) Drying Temperature 92.2 78 76.7 76.2
(°C) Melt Temperature 250 216 220 215
(°C) Mold Temperature 69.5 49.6 52 52.9
Materials (PS)
Grade General-purpose polystyrene (GPPS)
Melt Flow Index (MFI) Typically 5-15 g/10 min
Injection Molding Temperature 180-220°C (356-428°F)
Injection Pressure 800-1500 bar (11603-21756 psi)
Mold Temperature 20-70°C (68-158°F)
Melting Point 410-480°F
Hardness Level R75
Impact Strength ~0.8 ft-lb/in notched Izod
Flexural Strength ~12000 psi
Shrink Rate 0.3-0.7%
Process for Polystyrene Injection Molding

The polystyrene is heated to a liquid state before the injection molding procedure can start. In order to give it the shape you want, the final step is to apply it to a two-sided mold. After cooling, the item is put into a container before receiving last-minute adjustments in post-processing.

Consideration for Part Design

Although polystyrene is very straightforward to injection mold, parts designers must nonetheless follow recommendations in the following areas:

Wall Thickness: Keep the thickness of your walls constant to ensure optimal flow and prevent warping or sink marks.

Rips and Bosses: To increase the strength and stiffness of the item, add suitable fillets and rib thickness.

Draft Angles: Use draft angles to improve part ejection and reduce part distortion.

Gate Design: To ensure correct filling and prevent obvious gate marks, choose an appropriate gate position and design.

Ventilation: Make sure there is sufficient ventilation so that gases and air can escape throughout the injection molding process.

Surface Finish: Take surface finish needs into account and choose the proper mold textures or post-processing methods.


Polystyrene injection molding is a manufacturing process that involves injecting molten polystyrene into a mold cavity to produce various plastic products. Here are some typical uses for polystyrene injection molding:

  • Plastic serving ware
  • Cases for CDs
  • Container for food
  • Plastic model kits
  • “To-go” boxes
  • Materials for packaging
  • Lab equipment
  • Water bottles
  • Medical equipment
  • Cups
  • Insulation
  • License plate frames
What kind of molding process is used to create polystyrene products?

For the purpose of injection molding, polystyrene works well. It can be used to create foam or solid, stiff items through injection molding.

Can polystyrene be molded easily?

Thermoplastic polystyrene is one type. It melts when exposed to heat, making molding easy. Foam, food containers, and technological items are all packaged with it.

Does polystyrene withstand moisture?

They can withstand moisture produced by the product inside as well as moisture from the environment outside.

One Stop Plastic Injection Molding Expert

We are your one-stop plastic injection molding services provider that offers cost-effective solutions and high-quality plastic components.
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