Polyester Applications Minimize

TECHNICAL AND ECONOMIC ADVANTAGES result from the inclusion of Spheriglass® solid glass spheres in polyester resin mouldings. A series of laboratory studies has confirmed field reports that the addition of glass spheres, suitably treated for bonding to polyester resin, improves properties of gel coats, hand lay-up mouldings and gel coats.




  • Increases abrasion and scratch resistance
  • Reduces staining
  • Reduces water absorption
  • Lowers cost



  • Reduces warpage
  • Improves mechanical properties
  • Eases wet-out of glass mat
  • Lowers water absorption
  • Reduces cost (above 40 PHR loading)



  • Permits very high filler loading
  • Reduces gel and cure time
  • Lowers shrinkage uniformly
  • Improves mechanical properties
  • Reduces distortion


Compared to other fillers:

  • Easier to mix
  • Higher concentrations possible
  • Lower viscosity change
  • Easier to de-aerate Easier to pour
  • Much lower gel and cure time     
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