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Selected uses of solid spheres are: Calibrating measuring systems, sieve and Filter calibration, reflective markings, Abrasive s, Binder spacings. Hollow spheres have uses ranging from storage and slow release of Pharmaceutical s and Radioactive Tracer s to research in controlled storage and release of Hydrogen .

Hollow spheres are also used as a lightweight s and deep-sea oil drilling equipment, where other types of foam would Implode . Hollow spheres of other materials create syntatic foams with different properties, for example ceramic balloons can make a light syntatic Aluminium foam. (Foams on the Cutting Edge)

Glass microspheres can be made by heating tiny droplets of dissolved Water Glass in a process known as Ultrasonic spray Pyrolysis , and properties can be improved somewhat by using an acid treatment to remove some of the Sodium {Link without Title} .


REFERENCES

# Syntactic foam properties & applications
# Microballoon synthesis & thermal properties.