In Spark test, AC or DC apparatus is related with a broom. The surface area in the reactor which has a glass lining is brushed using a broom. If a defect or ruined portion comes in contact with the broom, it generates a spark since the destroyed component exposes MS https://silicon-carbide-cantileve93602.wssblogs.com/28955175/a-review-of-glass-lined-reactor-agitator-types