crystallization that would normally take place over time for such arylene bridged oligomeric phosphate compositions by adding a sufficient amount of an alkylene bridged oligomeric phosphate to such an arylene bridged oligomeric phosphate composition to effect such retardation of crystallization the arylene bridged oligomeric phosphate compositions that can be improved in regard to their crystallization behavior are of the following formula where r 1 r 2 r 3 r 4 are each aryl or substituted aryl x is a bridging group derived from a diol that comprises an arylene moiety and n preferably ranges from about 1 to about 5 the grouping u2014 o u2014 x u2014 o u2014 in the above depicted formula can be derived from such diols as hydroquinone resorcinol and bisphenol a the foregoing type of phosphate compositions can have their crystallization retarded upon being stored by the incorporation therein of an effective amount from about 10 to about 80 by weight of the arylene bridged oligomeric phosphate composition of the formula where r 1 r 2 r 3 r 4 are each aryl or substituted aryl x is a bridging group derived from a diol that comprises an alkylene moiety and n preferably is 1 the grouping u2014 o u2014 x u2014 o u2014 in the above depicted formula can be derived from a diol such as neopentyl glycol this effect for the alkylene bridged bisphosphate is unexpected despite the fact that mixtures of it and arylene bridged oligomeric phosphate compositions have been described before in pct wo 96 11996 for improvement of the viscosity of oligomeric phosphate ester flame retardants this pct patent application does not discuss the effect that the alkylene bridged bisphosphate has when the blend of it and the arylene.