PBTC has a low content of phosphoric and structural features of both phosphoric acid and carboxylic acid groups, which enable its excellent scale and corrosion inhibition properties. Its antiscale property under high temperature is far better than that of organophosphines.

Phosphonobutane tricarboxylic acid (PBTCA) can improve zinc salt solubility, has good chlorine oxidation tolerance, and good composite synergy.

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Molecular Formula:


Molecular Weight:


Structure Formula:

PBTCA structure formula


AppearanceColorless or light yellow transparent liquid
Active  acid, %50.0-51.0
Phosphorous acid (as PO33-), %0.5 Max.
Phosphoric acid (as PO43-), %0.2 Max.
pH (1% water solution)1.5-2.0
Fe, ppm10.0 Max.
Chloride, ppm10.0 Max.
Density (20℃), g/cm31.27 Min.


PBTCA is a highly efficient agent as a scale and corrosion inhibitor. The PBTC acid is an excellent stabilizer for zinc salt. It is widely used in circulating cool water systems and oilfield refill water systems as scale and corrosion inhibitor.

Phosphonobutane tricarboxylic acid is suitable to composite with zinc salt and copolymer. It can be used in situations of high temperature, high hardness, high alkali, and high concentration index. In lavation fields, PBTC is used as a chelating agent and metal detergent.

PBTCA is usually used together with zinc salt, copolymer, organophosphine, imidazole, and other water treatment agents. When used alone, the dosage of 5-15mg/l is preferred.

Packing and Storage:

200L plastic drum, IBC(1000L), customers requirements. Storage for one year in shady room and dry place.

200l plastic drum 1000l IBC

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.


2-Phosphonobutane-1 2 4-Tricarboxylic Acid, Dequest 2060.