Class 4 – Flammable Solids Substances Liable To Spontaneous Combustion; Substances Which, In Contact With Water, Emit Flammable Gases Class 4 is divided into three divisions as follows: Division 4.1 Flammable solids Solids which, under conditions encountered in transport, are readily combustible or may cause or contribute to fire through friction; self-reactive substances which are … Continue reading Class 4 – Flammable Solids