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HEMPA (Hydroxyethylamino-Di(Methylene Phosphonic Acid)

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

Structural Formula:

HEMPA (Hydroxyethylamino-Di(Methylene Phosphonic Acid)  


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.





Colorless to light yellow transparent liquid

Active content %

60.0 min

pH (1% water solution)

2.0 max

Chloride (as Cl-)%

5.0 max

Fe, mg/L

20 max

Density (20℃) g/cm3

1.30 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.


Ethanolamine bis(methylenephosphonic acid); EABMP Acid