LAPEX R compounds are based on PPSU, an amorphous resin that belongs to the sulphonic resin group and which colour is transparent black. Impact resistance is improved by the presence of diphenylic units, while at the same time notch sensitivity is lowered.

Main properties
  • Excellent dimensional stability;
  • Excellent mechanical properties;
  • Excellent creep resistance even at high temperatures;
  • Excellent impact resistance, also notched;
  • Excellent thermal properties (high C.U.T. and H.D.T. values);
  • Low flammability and smoke emission;
  • High hydrolysis resistance;
  • Good resistance to sterilization cycles;
  • Good electrical insulation.
The PPSU belongs to the family of the amorphous materials suitable for high temperature applications, thanks to the outstanding combination of different properties: thermal, mechanical, and impact and hydrolysis resistance.
The resin shows an excellent resistance to the flame propagation without adding any specific additive. During combustion phase a low heat level is generated and low smoke or gas emissions are released; for these reasons PPSU is considered suitable for applications in the public sector (buildings, aeronautics, ships…).


Cracking or long-term rupture due to internal residual stresses can be found. In order to prevent or reduce such phenomena, careful part design and correct moulding process are required. Eventually, annealing parts at 165°C (1 hour per mm of wall thickness) allows reducing residual stresses.
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