20 Projectile Test20.1 When subject

20 Projectile Test20.1 When subjected to the test described in 20.2 – 20.5 no part of an exploding cell or battery shall penetrate the wire screen such that some or all of the cell or battery protrudes through the screen.20.2 Each test sample cell or battery is to be placed on a screen that covers a 102-mm (4-in) diameter hole in the center of a platform table. The screen is to be constructed of steel wire mesh having 20 openings per inch (25.4 mm) and a wire diameter of 0.017 in (0.43 mm).20.3 The screen is to be mounted 38 mm (1-1/2 in) above a burner. The fuel and air flow rates are to be set to provide a bright blue flame that causes the supporting screen to glow a bright red.20.4 An eight-sided covered wire cage, 610-mm (2-ft) across and 305-mm (1-ft) high, made from metal screening is to be placed over the test sample. See Figure 20.1. The metal screening is to be constructed from 0.25-mm (0.010-in) diameter aluminum wire with 16 – 18 wires per inch (25.4 mm) in each direction.