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HEMPA Hydroxyethylamino-Di(Methylene Phosphonic Acid)

CAS No. 5995-42-6        Molecular weight: 249

Structural Formula:



HEMPA is an organophophoric acid, which exhibits excellent chelation, scale inhibition and corrosion inhibition. It is mainly used in oilfield, detergent / soap and metal treatment etc, especially useful in the water sytems with high level of dissolved iron and calcium. It is also compatible with methanol/water solution. When built together with other water treatment chemicals, it shows good synergistic effects.


AppearanceColorless to light yellow transparent liquidColorless to light yellow transparent liquid
Active content, %50.0 min60.0 min
pH (1% water solution)2.0 max2.0 max
Chloride (as Cl-), %5.0 max5.0 max
Fe, mg/L20.0 max20.0 max
Density (20℃), g/cm31.20 min1.30 min


HEMPA is usually used together with other organophosphoric acid, polycarboxylic acid and salt in different areas.

Package and Storage:

250kg/drum; 1250kg/IBC; or customers’ requirement. Storage for ten months in shady room and dry place.

Safety Protection:

Avoid contact with eye and skin. Goggles and rubber gloves should be used at all times while handling the product.