PS/GPPS (Polystyrene/General Purpose Polystyrene)  

There are various forms of polystyrene that are currently in use, including homo-polymers PS, GPPS, and EPS, as well as PS-copolymers, SB, SBS, SAN, and ABS.     


Hard amorphous polystyrene is crystal-clear, hard, and sensitive to impact.  It generates a brittle, rattling, glassy-like sound when struck.  Polystyrene may be dyed to match any color choice.  When in foamed form, it has a white opaque color and, in comparison to solid polystyrene, lower mechanical strength but higher flexibility. 

Areas of Application:

Amorphous PS is a standard plastic that is widely used and can be found in common applications that are used daily.


EPS/XPS (Expanded Polystyrene/Extruded Polystyrene)

Due to their low thermal conductivity (≈ 0,03 W/(m·K)), EPS and XPS are commonly used within both the building and packaging sectors in foam form, with a thickness between 15 (building insulation) and 90 kg/m3 (ski helmets).  

  1. Crystal-clear
  2. Hard
  3. Sensitive to impact, brittle
  4. UV-sensitive
  5. Brittleness and stress-cracking when exposed to light
  6. Little heat resistance
  7. Good resistance against aqueous lyes and mineral acids
  8. Poor resistance towards non-polar solvents, such as benzine and longer-chain ketones and aldehydes
  9. Can be dissolved with dichloromethane and nearly seamlessly welded
Areas of Application:

Syndiotactic Polystyrene crystallizes quickly enough to be used in typical injection molding processes for construction materials.  Due to its extremely high resistance towards chemicals, hot water, and coolants, it provides a good alternative to already established technical plastics. 

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