Glass Microspheres

Mo-Sci has extensive experience in manufacturing glass microspheres. We also develop glass compositions whose properties are tailor-made to satisfy particular applications. If you need a special glass frit, glass microsphere spacer or desire further information, contact our office and one of our engineers will be happy to discuss our products and services with you.

A number of standard glass compositions are available (soda lime, barium titanate, type 1A borosilicate) as well as custom-made glass compositions.

Special surface treatments can be given to the microspheres to fit almost any need.

No special handling is needed with our glass microspheres, since they contain no toxic elements. The CAS Registry Number is: 65997-17-3.

Selected Properties

  • Density from 2.2 to 4.5 g/cm3
  • Refractive Index (nD) 1.47 to 2.10
  • Thermal Exp: 40 to 100 x 10-7°C-1
  • Thermal Softening: 400 to 830°C
  • 90% Survival crush strength: ~40,000 psi
  • Excellent chemical durability




            Class IV                                    Glass V                                    Class VI


Class IV Industiral Grade Microspheres

Industrial Grade Microspheres provide high quality glass beads at a more economical price point for such applications as filler materials and adhesive spacer. These microspheres are supplied with 85% true spheres and 80% or better sizing in the specific range.

Class V Engineering Grade Microspheres

Engineering Grade Microspheres provide precision sizing with a high spherical quality. These microspheres are supplied will 90% true spheres and 90% or greater sizing with in the range.

Class VI Spacer Grade Glass Microspheresbondline spacers

Spacer Grade Glass Microspheres (SGGM) are manufactured to provide highly accurate bondline spacing. These microspheres are supplied with greater than 90% true spheres and greater than 95% in the specified size range. Sizes range from 38µm±7% to 850µm±5%.

Spacer Grade Glass Microspheres are highly spherical and free of odd shapes and angular particles. Their high sphericity, close size tolerances, and high mechanical strength and chemical durability make them ideal for all applications that require these high-grade standards.

Spacer Grade Glass Microspheres can withstand temperatures up to 830°C which makes them ideal for high temperature applications.

Spacer Grade Glass Microspheres are presently used in gas plasma displays, automotive mirrors, electronic displays, flip chip technology, filters, sporting goods equipment, calibration standards and transformer manufacture (see application note).