A glass bead

 A glass bead is a sphere made from chemically inert sodalime glass. They have a high surface hardness, allowing them to impact a base surface without causing any dimensional change or contamination. These beads are used in a variety of applications, from deburring to cleaning and cosmetics. They are also one of the most versatile blast finishing materials, and are excellent for removing metal and developing aesthetically pleasing finishes. 

A glass bead is an extra-small diameter ball with a low density and low compressive strength. The size is about 149-88 microns. They are able to peen surfaces without damaging the metal. Under normal conditions, glass beads can be recycled thirty times. The most commonly used glass bead size is the MILPRF-9954B No. 8 glass bead. This specification was approved on September 26, 2005 by the Department of Defense.

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