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4. SC-204 (ZF131SC)  2-phosphonobutane-1,2,4-thicarboxylic acid (PBTCA)

Issuing time:1998-01-03 19:58

All the water treatment agents in circulating cooling system contains PBTCA in USA and Europe recently. Such as N-7354 from Nalco, DP-3094 from Ciba-Geigy, S-1050 from Kurita and HP-1000E from Katayama.

(1) Mol.wt.&Formula:

270, C9H21O9P

(2) Properties:

(3) It has the structural properties of phosphonic acid and carboxylic acid group, so it shows excellent corrosion and scale inhibition. It has outstanding features compare with normal organic phosphonic acid. In the meanwhile, it shows better scale inhibition and can increase the solubility of zinc as well. It can even dissolve zinc when the PH reaches 9.5.

(4) Specification:


Yellow brown Transparency liquid

The content of PBTCA


The content of phosphorous acid(by PO3-3)




The content of phosphoric acid(by PO3-4)






(5) Application:

It is added into the cooling water when compounded with zinc which will improve the corrosion inhibition and scale inhibition in the alkaline system. The normal dosage is 5-15ppm and it is advisable to add continuously.

(6) Packing and storage:

Packed in 25kg plastic bucket. It can be stored for 2 years.

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