What is HEDP?

HEDP (1-Hydroxyethylidene-1,1-diphosphonic acid) is an organophosphonic acid compound widely used as a chelating agent and scale/corrosion inhibitor. It effectively binds metal ions such as calcium, iron, and copper, preventing scale formation and metal corrosion in various water systems.

HEDP 60% Liquid vs. HEDP 90% Solid

HEDP 60% Liquid: A transparent, colorless to pale yellow aqueous solution with excellent solubility, commonly used in water treatment systems requiring direct application without additional dissolution.

HEDP 90% Solid: A high-purity crystalline powder form with a longer shelf life and lower transportation cost. Requires dissolution before use and is ideal for high-concentration or remote applications.

Main Applications of HEDP

HEDP is utilized in a wide variety of industrial and commercial sectors, including:

• Water Treatment: Cooling water systems, boiler water, RO membrane systems, and municipal water treatment plants.

• Oilfield Industry: Used as an additive in oilfield water injection systems to prevent scale and corrosion.

• Detergents & Cleaning: Acts as a chelating agent in industrial detergents and cleaning agents.

• Textile & Dyeing: Prevents metal ion interference in dyeing processes and stabilizes bleach formulations.

• Cosmetics & Personal Care: Sometimes used as a stabilizer for peroxide-containing formulations (with regulatory limitations).

How to Use HEDP

HEDP is usually dosed directly into circulating water systems or pre-mixed with other water treatment chemicals.

Recommended Dosage:

Note: Always adjust dosage based on water quality, system conditions, and testing results.

Advantages of Using HEDP

• Excellent thermal and hydrolytic stability

• Long-lasting anti-scale and corrosion inhibition effects

• Effective in alkaline pH environments

• Compatible with most other water treatment agents

Storage & Handling

HEDP 60%: Store in a cool, dry, and ventilated area. Protect from freezing.

HEDP 90%: Store in tightly sealed bags or containers, away from moisture and direct sunlight.

Conclusion

HEDP, available in both 60% liquid and 90% solid forms, is a versatile and effective chemical used in water treatment, oilfield, textile, and detergent industries. Its strong chelating ability and scale/corrosion resistance make it an essential part of industrial fluid management systems. Whether you require ready-to-use liquid or space-saving solid, HEDP can be tailored to meet your operational needs.

TDS-HEDP-antiscaling agent.pdf