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Chelating Agent Tetra Sodium Salt of HEDP
RAW MATERIAL
HEDPS

Chelating Agent Tetra Sodium Salt of HEDP

Chelating Agent Tetra Sodium Salt of HEDP is a water-soluble tetrasodium etidronate supplied in liquid and solid grades for chelation, scale control, corrosion inhibition, and detergent applications.

Chemical Name
Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
Molecular Weight
294
Molecular Formula
C2H4O7P2Na4
EINECS
223-267-7
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PRODUCT OVERVIEW

Product Description

Chelating Agent Tetra Sodium Salt of HEDP is the tetrasodium salt of HEDP and is supplied in both liquid and solid forms. The liquid grade is a colorless to yellowish transparent liquid, while the solid grade is a white water-soluble powder. HEDPS provides chelating, scale-inhibition, and corrosion-inhibition properties and can form stable complexes with metal ions such as iron, copper, and zinc. It is used in circulating cooling-water systems, low- and medium-pressure boiler systems, industrial cleaning, detergent applications, dyeing processes, and non-cyanide electroplating.
PRODUCT PARAMETERS

General Parameters

Appearance
HEDPS liquid: colorless to yellowish transparent liquid; HEDPS solid: white powder.
KEY PROPERTIES

Product Characteristics

Available in liquid and solid forms.
Water-soluble tetrasodium salt of HEDP.
Provides chelating, scale-inhibition, and corrosion-inhibition properties.
Can form stable complexes with iron, copper, and zinc ions.
The solid grade is suitable for applications requiring a powder form and shows good performance under elevated-temperature conditions.
TECHNICAL SPECIFICATIONS

Specification Data

Specification HEDPS liquid HEDPS solid
Appearance Colorless to yellowish transparent liquid White powder
Active content (HEDP) by wt % 20.3-21.7 60.0 min
Active content (HEDP·NA4) by wt % 29.0-31.0 85.0 min
Phosphoric acid (as PO43-) by wt % 18.4-20.4 55 min
pH (1% water solution) 10.0-12.0 11.0-12.0
Density (20ºC) g/cm3 1.26-1.36 -
Fe by mg/L20.0 max 20.0 max 35.0 max
Moisture - 10.0 max
APPLICATIONS

Typical Uses

✓
Used as a chelating and scale-control agent in circulating cooling-water and boiler-water systems.
✓
Used as a scale and corrosion inhibitor in industrial water-treatment systems and oil-field water pipelines.
✓
Used in metal and non-metal detergent and cleaning applications.
✓
Used as a peroxide stabilizer and dye-fixing agent in dyeing processes and as a chelating agent in non-cyanide electroplating.
STORAGE & HANDLING

Handling Guidance

Store in suitable sealed packaging in a cool, dry, and well-ventilated storage area. Protect the product from direct sunlight, moisture, and incompatible materials. Liquid and solid grades should be stored in packaging appropriate to their physical form and protected from contamination. Storage and shelf-life requirements should follow the actual supplier COA, SDS, and technical documentation.
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