Microspheres Online

Everything about microspheres and research utilizing precision spherical particles.

Glass microspheres

Patent Review: Process for forming hollow glass spheres up to 5mm

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A process for forming hollow glass micro-spheres with walls of controllably variable thickness in a size range of 50 to 5,000 microns, embodying (1) preparation of a water slurry of finely particulated, high temperature and low temperature glass formers; (2) prilling the slurry in a vertical spray drying tower; (3) separating and supporting the individual prilled feed material; (4) heating the feed material to glassification of the high temperature glass former while maintaining appropriate geometry and shell thickness and (5) cooling the finished product. The high temperature glass former is preferably a naturally occurring soda feldspar. The process is particularly adapted to form thicker walled micro-spheres of larger size and high quality.

Advantages of Borosilicate Glass Microspheres in 0.03mm to 0.2mm sizing

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Borosilicate Glass Microbeads
BSGMS 63-75 micron at 40x magnification

High quality glass microspheres for research and development are always in high demand.? In an effort to better serve scientists Cospheric recently added a complete line of high quality borosilicate microspheres, and microbeads.

Borosilicate glass offers? advantages over standard soda lime glass microbeads.

  • Roundness is >90%?? (Soda lime >85%)
  • Density is the lowest of most glasses at 2.2g/cc? (Soda Lime 2.5g/cc)
  • Very low thermal expansion coefficient? 32×10-7/?C?? (for 30-300?C)?? (Soda Lime:? 90×10-7/?C)

The high roundness, and low thermal expansion make borosilicate spheres an excellent candidate for use as spacers in epoxy bond lines, or other applications which require stability over a wide temperature range.

Borosilicate glass spheres are now offered in narrow size ranges from 0.03mm to 0.2mm with greater than 90% of the particles in range.

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Silica Microspheres – 6 micron mean Diameter

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Silica is a chemically stable inorganic synthetic material. It has the benefit of providing no irritation to human skin. Silica is essentially transparent, colorless and promote a high degree of slip in products. The skin feel is generally lubricious in nature. Spherical silica imparts exceptional lubricity to loose and pressed powder products. The effect is increased ‘play time’ and a luxurious feel. Spherical products with mean particle size between 3 to 10 micron will scatter light on the surface of its particle, ie which are transparent, but give natural coverage.

Monodisperse – Spacer Grade Microspheres

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Scientists are constantly looking for narrower particle size distributions (monodispersed) of microspheres to help increase the consistency and correlation between theoretical models and verification experiments.? In an effort to fill the increasing demand for these particles Cospheric has launched a new line of spacer grade microspheres. Monodisperse microspheres are currently offered in diameters of:?? 21-24um, … Read more

Microspheres Online

About us:

We are compiling a digital database on everything that has to do with microspheres and creating a destination for scientists working with  precision spherical particles.

What we offer:
  • introduction to microsphere products and their uses;
  • technical information and what specifications are important;
  • overview of published articles and research using microspheres;
  • support in sourcing the right material for your project and more.
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