The test is conducted to assess the behaviour (severity) of combustion propagation through a material deposit when ignited by an external ignition source. A small powder strip is formed onto a heat resistant, non-porous plate and ignition trials are performed using a hot (1000 °C) platinum wire. The burning behaviour is numerically rated from 1 (material does not ignite) to 6 (supports rapid combustion) in accordance with the test standards characterisation table. The rating is known as “CC” or Combustibility Class and testing is performed at ambient and elevated environmental temperature conditions.