ester composition consisting essentially of an effective amount of a cycloaliphatic epoxy composition for reduction of the total acid number of the composition the phosphate ester is of the formula where r can be aryl or alkaryl r u2032 can be arylene arylene alkylene arylene or alkylene and n ranges from about 1 to about 5 application_number US 14456802 A description this invention relates to such polyphosphate compositions that have been stabilized by the addition of a certain class of epoxy stabilizer this invention allows for a polyphosphate epoxy stabilizer pre mix that can thereafter be added to a substrate resin e g an engineering resin to stabilize the final flame retarded resin formulation the epoxy stabilizer of choice herein is one or more cycloaliphatic epoxy compounds having a c 6 to c 20 cycloaliphatic ring they are alicyclic epoxy compounds where the alicyclic epoxy structural units are linked through a bonding unit which is either a dioxane or a carboxyl structural unit useful cycloaliphatic epoxy compounds include 3 4 epoxycyclohexylmethyl 3 4 epoxycyclohexane carboxylate which is available as erl 4221 a union carbide corporation trademark and araldite cy 179 a ciba geigy trademark the diglycidyl ester of hexahydrophthalic anhydride which is available as cy 184 a ciba geigy trademark bis 3 4 epoxycyclohexylmethyl adipate which is available as erl 4299 a union carbide trademark vinyl cyclohexene dioxide erl 4206 vinyl cyclohexene monoxide and 2 3 4 epoxycyclohexyl 5 5 spiro 3 4 epoxy cyclohexane meta dioxane erl 4234 in general this epoxy component can be.