HEDP•Na4 Granule Technical Specifications

HEDP·Na₄ Granule (Tetrasodium 1-Hydroxyethylidene-1,1-diphosphonate) is a granular chelating agent widely used in water treatment, detergents, and industrial cleaning. Below are the standard technical specifications:

1. Basic Information

Chemical Name: Tetrasodium 1-Hydroxyethylidene-1,1-diphosphonate

CAS No.: 3794-83-0

Molecular Formula: C₂H₆O₆P₂Na₄

Molecular Weight: 294.00

Appearance: White free-flowing granules

2. Typical Technical Indexes

Item Specification

Active content (as HEDP) 57.0 – 63.0 %

Active content (as HEDP·Na₄) 81.0 – 90.0 %

Total phosphorus (as PO₄³⁻) ≥ 54.0 %

Iron (Fe²⁺) ≤ 20.0 mg/kg (ppm)

Loss on drying ≤ 10.0 %

pH (1% aqueous solution) 11.0 – 12.0

Bulk density (20°C) 0.60 – 0.80 g/cm³

Particle size distribution < 250 μm: ≤ 4.0 %

> 800 μm: ≤ 5.0 %

3. Key Properties

Solubility: Highly soluble in water; insoluble in organic solvents.

Stability: Stable under high temperature and pressure; resistant to hydrolysis.

Chelation: Strong chelating ability for Ca²⁺, Mg²⁺, Fe²⁺, Cu²⁺, etc.

Function: Excellent scale inhibition, corrosion inhibition, and metal ion stabilization.

4. Packaging & Storage

Packing: 25 kg/bag (PE inner bag, woven bag outer)

Storage: Store in a cool, dry, well-ventilated area; avoid moisture.

Shelf life: 12 months under proper storage.