Halogenated Phosphate Flame Retardants are both vapour phase and solid phase agents and during combustion, the phosphate forms a char layer on the surface of the foam, acting as an insulator for the remaining material. The Retardants are used in the manufacture of flexible slab-stock foam and can also be used as flame retardants for epoxy resins, phenolics and unsaturated polyester resins. The Retardants are offered in 55 gallon steel drums, 275 gallon polyethylene steel-reinforced tote bins or in bulk containers. The Halogenated Phosphate Flame Retardants interfere with flame propagation in the vapour phase.