Description

1-Hydroxyethylidene-1,1-Diphosphonic Acid Trisodium Salt is a highly effective and versatile phosphonate-based scale and corrosion inhibitor. This compound is valued for its exceptional chelating and threshold inhibition properties, making it a critical component in water treatment and industrial cleaning formulations. It is essential for industries requiring reliable control of mineral scale, corrosion, and metal ion stabilization in aqueous systems.

Application

• Industrial Water Treatment: Primary application as a scale and corrosion inhibitor in cooling water systems, boiler water, and reverse osmosis membranes.
• Detergent & Cleaning Formulations: Acts as a builder and sequestrant to enhance cleaning efficiency by inactivating water hardness ions (calcium, magnesium).
• Oilfield Chemicals: Used in drilling fluids, fracturing fluids, and production systems to prevent scale deposition in downhole and surface equipment.
• Pulp & Paper Industry: Employed as a chelant in bleaching processes and to control scale in paper mill white water systems.
• Textile Processing: Serves as a peroxide stabilizer and sequestrant in bleaching and dyeing baths to improve process uniformity.
• Personal Care Products: Incorporated as a stabilizing agent in formulations such as shampoos and liquid soaps.

Basic Information

Product Name	1-Hydroxyethylidene-1,1-Diphosphonic Acid Trisodium Salt
CAS No.	2666-14-0
Molecular Formula	C2H7Na3O7P2
Molecular Weight	273.99 g/mol
Synonyms	HEDP Trisodium Salt; Etidronic Acid Trisodium Salt; (1-Hydroxyethylidene)bisphosphonic Acid Trisodium Salt; Phosphonic Acid, (1-Hydroxyethylidene)bis-, Trisodium Salt; Dequest 2016; Briquest ADPA-60SH; HEDP•Na3
EINECS	220-201-5

Quality Control

Our 1-Hydroxyethylidene-1,1-Diphosphonic Acid Trisodium Salt is manufactured under a strict quality management system. Production adheres to relevant industry standards, and each batch is subjected to rigorous analytical testing to ensure consistent purity and performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may lead to caking or reduced efficacy.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or granules
Identification (IR)	Conforms
Assay (HEDP•Na3)	≥ 94.0 %
pH (1% aqueous solution)	10.0 - 12.0
Water Content	≤ 5.0 %
Chloride (as Cl)	≤ 0.01 %
Iron (Fe)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.