Arylphosphate esters are used mainly as fire retardant additives for electrical appliances, so they may leak out, in part react and vaporize during this recycling process.
Halogenated fire retardants, which were extensively used in the past, have been phased out since the 1980s due to the environmental issues of halogen compounds and replaced with non-halogenated fire retardants.
Among the nonhalogenated fire retardants, aryl-phosphates are representative and include mono-phosphates, such as TPP, tricresyl phosphate, dicresylphenyl phosphate, cresyldiphenyl phosphate, trixylyl phosphate,
etc., and bis-phosphates including resorcinol bis(diphenyl)