Glass Microspheres

We are the UK and Eire distributor for Sovitec filler applications of microperl glass microspheres.  Sovitec are a major European producer of glass microspheres with their headquarters and manufacturing plant in Fleurus, Belgium, and other manufacturing plants in France, Spain and Germany.

Microperl glass microspheres are translucent solid glass beads with a smooth surface and display the appearance of a fine white powder.  They are usually coated with a coupling agent which optimises bonding between the microperl and resin/polymer.  The average particle size can be as low as 20 microns.

Advantages in Thermoplastics

  • Very low oil absorption
  • ‘Ball bearing’ effect in mixing which leads to reduced viscosity and improved production speed.  Isotropic and controlled shrinkage giving improved dimensional stability

Advantages in Epoxy and Polyester Resins

  • Very low oil absorption
  • Reduced viscosity, or lower resin content at equivalent viscosity.  Improved flow and easier elimination of air bubbles

Microperl Surface Treatment

The following surface treatments are available:

  • Coupling Agent Type 215 – recommended for polyamide, polypropylene, polycarbonate, epoxy, melamine-formaldehyde, phenol-formaldehyde
  • Coupling Agent Type 216 – recommended for PBT, SAN
  • Coupling Agent Type 217 – recommended for ABS, polyethylene, polystyrene, polyester, acrylic


The new generation of ultra-fine glass beads with an average particle size down to 3 microns.  Used in applications where the finest particle size is needed for improved scratch and abrasion resistance.  Used in paints and coatings, improved performance wood coatings, and as an anti-block in plastics films.

Further information for the Sovitec product range can be found at

Other particle size ranges are available, please contact me for further details.

Microperl Glass Microsphere Product Selection Chart

Sovitec 050 20 215 TDS
Sovitec 050 40 215 TDS


Microperl Glass Beads MSDS