HEDPA is cathode type corrosion inhibitor, compared with the inorganic polymeric phosphate, the corrosion rate of about four times higher. HEDPA with other corrosion and scale inhibitors, such as chromate, polymerization phosphate and molybdate, silicate, zinc salt, salt poly hydroxy acid and its derivatives, etc, has a synergistic effect, can improve the efficacy.

Because of the different raw materials, so HEDPA synthesis method is different also, so can be divided into three kinds: with phosphorus trichloride and Acetic acid as raw materials, with phosphorous acid and acetic anhydride as raw materials, phosphorous acid and acetyl chloride as the raw material.

1-Hydroxyethylidene-1,1-diphosphonic acid liquid packed in plastic drum, 30 kg or 250 kg a barrel; HEDP solid packed in plastic woven bags lined with polythene bags, bags of 25 kg net each, can also according to user’s need to make sure. Storage in indoor cool ventilated place, moistureproof, storage period of ten months.

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