Glass shot conforming to this specification is intended for use in peening of metal surfaces to impart compressive stresses, thereby increasing resistance to fatigue and stress-corrosion cracking. Generally, glass shot may be used where:
Very low intensities are required because glass shot is available in smaller sizes than other media.
Very small, under 0.015 inch (0.38 mm) radii or narrow slots are intended to be peened.
Ferrous contamination of peening media is undesirable.