Glass beads under the brand name of Microperl ranging from 20 - 150 microns are used as reinforcing fillers. These glass are used in thermoplastics as well as thermoset resins.

They improve mechanical properties like,

• Gravel resistance
  
• Dimension of Stability
  
• Scratch Resistance
  
• Abrasion Resistance
  
• Surface Uniformaties

Glass beads provide better lubrication compared to glass fibers. They improve the mould filling due to better flow.

To improve dispersion in polymer matrix they are coated with different coupling agent for different synthetic resins.

Several grades in different particle size are available for specific plastic materials.