1 HYDROXYETHYLIDENE 1, 1 DIPHOSPHONIC ACID (CAS NO 2809-21-4) IN WATER. IT IS PRODUCED BY REACTION AND HYDROLYSIS OF PHOSPHOROUS TRICHLORIDE IN AQUEOUS ACETIC ACID AT ELEVATED TEMPERATURE. CHEMICAL IS FOR USE IN VARIOUS AREAS SUCH AS COOLING WATER TREATMENT, SCALE AND CORROSION INHIBITION, BOILER WATER TREATMENT AND CLEANERS.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 2931 - OTHER ORGANO-INORGANIC COMPOUNDS GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 293139 - OTHER CN CODE 29313950 FOR Etidronic acid (INN) (1-hydroxyethane-1,1-diphosphonic acid) and its salts ALSO CLASSIFIED IN ACCORDANCE WITH: CHAPTER 29, GENERAL CHAPTER NOTES 1 (A) AND 1(D)