glass microsphere

Glass microspheres or microballoons are hollow spheres of glass, with a diameter of the order of one micrometer. They are used as a lightweight filler in composite materials such as syntactic foam. Microballoons give syntactic foam its light weight, low thermal conductivity, and a resistance to compressive stress that far exceeds that of other foams http://www.crgrp.net/syntactics.htm. These properties are exploited in the hulls of submersibles and deep-sea oil drilling equipment, where other types of foam would implode. 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 http://www.mrs.org/publications/jmr/jmra/1996/nov/p02908.pdf.

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