
THE STORY OF HEDP 50%
HEDP 50%: The High-Performance Chelating Agent for Formula Stabilitya
HEDP (1-Hydroxyethylidene-1,1-Diphosphonic Acid) is a powerful chelating and scale-control agent used to stabilize cosmetic, personal-care, and home-care formulations.
It prevents metal ion contamination, discoloration, oxidation, and ingredient degradation, making it essential for surfactant-heavy, high-mineral, or long-shelf-life products.
A Diphosphonic Acid Designed for Superior Metal Binding & Stability
HEDP is a diphosphonic acid derivative, synthesized for high chelation strength.
Its molecular structure allows it to:
• Bind iron, calcium, magnesium, copper & heavy metals
• Prevent scale formation in water-based systems
• Protect sensitive ingredients from oxidation
• Maintain clarity and color even in hard-water environments
TRCkem provides 50% active aqueous solution, ideal for both cosmetics and personal-care applications.
Stabilize. Protect. Preserve.
HEDP 50% offers multiple formulation advantages:
✅ Prevents metal-induced oxidation (keeps color & fragrance stable)
✅ Enhances preservative effectiveness
✅ Controls scale formation in water-based products
✅ Improves foam performance in shampoos & cleansers
✅ Maintains stability in high-mineral or hard-water regions
Used in: shampoos, face washes, body washes, serums, cleansers, liquid detergents, and bath products.
High-Efficiency Chelator — Use at Low Levels for Maximum Performance
• Typical use level: 0.05–0.5% (up to 1% in heavy-duty systems)
• Add to water phase during the early mixing stage
• Works effectively across wide pH range (2–12)
• Compatible with surfactants, preservatives, fragrances & active ingredients
• Avoid direct skin contact in raw form—use gloves and protective handling
• Store tightly sealed, away from heat and moisture
• Biodegradable and globally approved for personal-care applications
Formulator’s Queries, We Answered
1. What is HEDP 50%?
HEDP 50% (1-Hydroxyethylidene-1,1-Diphosphonic Acid) is a phosphonic acid-based chelating agent used in personal care formulations. It helps stabilize formulations by preventing metal ion interference, improving product stability and performance.
2. What is the CAS Number and INCI Name of HEDP?
CAS Number: 2809-21-4
INCI Name: Etidronic Acid
3. What are the benefits of using HEDP 50% in personal care products?
Chelating Agent – Binds metal ions to prevent product degradation.
Stabilizer – Enhances the stability of cosmetic formulations.
Water Softening – Helps prevent mineral buildup in formulations.
pH Regulator – Maintains the optimal pH in various products.
4. What are the common applications of HEDP 50% in personal care?
Skincare Products – Used in creams and lotions to stabilize active ingredients.
Hair Care Products – Found in shampoos and conditioners to improve efficacy.
Soaps & Cleansers – Prevents mineral deposits and enhances foam stability.
Oral Care Products – Used in some toothpaste formulations to prevent tartar buildup.
5. Is HEDP 50% safe for use in personal care products?
Yes, when used in regulated concentrations, HEDP 50% is considered safe in personal care formulations. It is generally well-tolerated but should not be used in excessive amounts to avoid irritation.
6. Can HEDP 50% cause skin or eye irritation?
At high concentrations, HEDP 50% may cause skin or eye irritation. It is recommended to use it within approved limits to ensure consumer safety.
7. Is HEDP 50% environmentally friendly?
HEDP 50% is biodegradable to some extent but should be handled responsibly to minimize environmental impact. Proper disposal methods should be followed.
8. Are there alternatives to HEDP 50% in personal care products?
Yes, alternatives include:
EDTA (Ethylenediaminetetraacetic Acid) – Another commonly used chelating agent.
Citric Acid – A natural chelating agent used in personal care formulations.
GLDA (Glutamic Acid Diacetic Acid) – A biodegradable alternative for eco-friendly formulations.








