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Polystyrene (PS) moulding: rigid and transparent components

We injection-mould polystyrene components to customer drawings: a rigid, lightweight, transparent thermoplastic for cosmetic parts and components that are not exposed to impact.

What is polystyrene (PS)?

Polystyrene is an amorphous thermoplastic made by polymerising styrene. In its standard form (GPPS, also known as crystal polystyrene) it is transparent, rigid and light, but brittle on impact. In the high-impact version (HIPS) a butadiene rubber phase increases toughness, at the expense of transparency.

It fills the mould easily, has low shrinkage and good dielectric properties. It is not suitable for high temperatures or for prolonged contact with solvents, oils and hydrocarbons.

Properties of polystyrene

  • Transparent
  • Rigid
  • Brittle
  • Lightweight
  • Good dielectric properties

Indicative continuous service temperatures for the most common grades: the exact value depends on the grade and formulation and should be checked on the data sheet of the chosen material.

What is polystyrene (PS) used for?

  • Transparent covers and caps
  • Components for household appliances and small devices
  • Rigid boxes and containers
  • Cosmetic parts for interiors
  • Insulating supports for electrical components

How we mould polystyrene (PS)

Polystyrene is easy to injection-mould: it normally needs no drying of the granules and allows short cycle times. For transparent parts, mould polishing and uniform cooling are what matter, as they prevent visible internal stresses.

PS or another material?

The material is chosen according to the conditions of use of the component. The closest alternatives:

Compare all materials in the comparison table

Do you have a component to make in PS?

Send us your drawing or a sample: the contact form opens with the material already selected. If the material is still open, we will choose it together.

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