Explosive ROFs specialised in producing either high-explosives, such as TNT (trinitrotoluene) or RDX; or propellants, such as cordite, but there were minor exceptions to this demarcation.
A number of UK World War II explosives factories were built and owned by ICI.
ICI Nobel's Ardeer site and its World War II agency factories produced, for example, 35% of the combined ROF and Agency Factories output of Cordite and 15% of the combined output of TNT.
[1] In both World War I and II the Royal Navy had its own government-owned factories producing propellants and explosives, for naval guns.
They both were closed as explosive manufacturing sites after World War II.