... 5.Free sample 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid----HEDP Shanghai Sungo is the leading group with ... ourselves to be the biggest and top supplier for Water treatment chemicals, fluoride Chemicals, oil field chemicals, basic and fine chemical raw materials, textile ... as detergent. Usually, HEDP is used together with polycarboxylic acid. Safety Protection: Avoid contacting with eye and skin, once ...