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321HS is one of the TPC Performance expandable polystyrene products range. It is a free flowing expandable polystyrene grade, consisting of spherical polystyrene beads containing pentane as the expansion agent. Expandable polystyrene (EPS) is normally expanded to achieve the low densities required for final step expansion. The typical density of this grade is around 22 kg/m3, but other densities are possible depending on applications and equipments.321HS is especially high strength formulated to achieve low density foam without lumps during pre expansion. This grade is not fire retardant, so it is not suitable for building applications.


  • Speed and ease of roof execution
  • Save on plaster, dirt and hardware
  • Stable against earthquakes
  • Easy shipping
  • Being light
  • Resistant to compression and impact
  • High speed implementation and cost reduction
  • It is a good insulator because it has low polarity
  • It has good resistance against water and other solvents

Place of use

High Density Block, Shape Molding 321HS is used as a multi-application packaging material for contour moldings with a minimum wall thickness of 10 mm. Properly processed EPS foam packaging made from 321HS provides high mechanical strength also with low densities. It is not hygroscopic and does not become friable in low temperatures. Molded EPS packaging parts have to act as shock absorbers and cushion their content against blows from outside, i.e. they have to absorb the energy released in an impact. The mainly closed cell structure of molded foam parts made from 321HS absorbs the impact stress as “deformation work”. In this process the air enclosed in the cells is first compressed, while bigger impact forces may also deform or crack the cell walls.


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