Ethylene Diamine Tetraacetic Acid Tetrasodium, also known as EDTA NA-4, is the salt resulting from the neutralization of ethylenediaminetetraacetic acid with four equivalents of sodium hydroxide. It is a white solid that is powder in form. The primary use for this material is as a chelating agent and is commonly found in in hair and skin products, cosmetics, and industrial cleaning formulations.