Any of a large class of plasticizers produced byt he direct action of alcohols on phthalic anhydride. The phthalates are the most widely used of all plasticizers and are generally characterised by moderate cost, good stability, low toxicity and good all-around properties. (Whittington's Dictionary of Plastics, published by Technomic Publishing). To find out more go to the Phthalate Esters Panel's new website or visit the American Chemistry Council website.