Expanded Polystyrene

Density range: 18 – 200 g/l



Expanded polystyrene (EPS) is produced from a mixture of about 90-95% polystyrene and 5-10% gaseous blowing agent, most commonly pentane. The solid plastic is expanded using steam and is injected in to an aluminum tool under high pressure. Different colours are available however, typically white EPS starts it life the size of a grain of salt. Once the raw material has gone through a process called pre-expansion the grain swells with air and expands up to 50 times its original size.

EPS is used for a vast number of applications however, one of its major applications is as a protective packaging for consumer electronic products and white goods. These days EPS is recognised as a technical moulding material and is now used throughout the automotive and HVAC markets.

Key benefits of EPS

  • Excellent thermal insulation
  • High compressive strength
  • Outstanding impact absorption
  • Resource efficient
  • Lightweight


EPS is a cost effective material that is widely used in:

Construction for its excellent compressive strength and thermal performance as well as efficient and reliable internal components and packaging.

Automotive components to help reduce vehicle weight and driver safety.

Heating, ventilation and air conditioning appliances for its strength and insulation characteristics.

Seating in both vehicles and aeroplanes to improve comfort and reduce weight to improve fuel economy.

Coloured Expanded Polystyrene

There is a large choice of colours you can take advantage of to customise your EPS parts even further.

Reasons to introduce a colour:

  • Improved aesthetics
  • Product branding
  • Colour coding, part identification

Coloured EPS can be ordered directly from our supplier or we can order in special pigments which will adhere to the EPS during the expansion process. It is important to note that the addition of colour has no adverse effects on the properties of the final product.