Hedp

Buyers must distinguish between HEDP Liquid (60%) and HEDP Solid/Powder (90%+). Key parameters include Active Content, Phosphorous Acid (as PO3³⁻) levels (typically <2.0%), and Iron (Fe) content (<10-35ppm). For high-end applications like electronics or cosmetics, a low-chloride grade is essential to prevent equipment corrosion.

HEDP is a versatile organophosphoric acid corrosion inhibitor. It is primarily used in circulating cool water systems, boiler water treatment, and oilfield water injection. Beyond water treatment, it serves as a peroxide stabilizer in the textile industry and a complexing agent in the electroplating industry due to its ability to form stable chelates with iron, copper, and zinc ions.

As a chemical product, HEDP must be accompanied by a valid MSDS (Material Safety Data Sheet). For international trade, ensure the supplier provides the UN Number (UN 3265) and Hazard Class 8 (Corrosive) documentation. If used in municipal water treatment, look for NSF/ANSI 60 certification to ensure it meets drinking water health effects standards.

HEDP shows excellent thermal stability and can remain effective at temperatures up to 200°C. It performs better than polyphosphates at high pH levels (up to pH 9), making it ideal for alkaline water cooling systems where it prevents scale formation without decomposing.

HEDP is classified as a Class 8 Corrosive Substance. The main risk involves leakage and container degradation. Ensure the supplier uses high-density polyethylene (HDPE) drums or IBC tanks. For sea freight, verify that the cargo is stored in a cool, ventilated area away from strong alkalis to prevent dangerous chemical reactions during transit.

Request a Pre-Shipment Inspection (PSI) by a third party like SGS or Intertek. Focus on the Active Acid content and Density tests. A common industry risk is 'diluted concentration,' so comparing the Specific Gravity (typically 1.43-1.47 for 60% liquid) against the provided COA (Certificate of Analysis) is a cost-effective way to verify purity.

HEDP pricing is heavily influenced by the cost of Yellow Phosphorus. Buyers should negotiate based on raw material index pricing and seek volume-based discounts (typically 5-10% for full container loads). On Made-in-China.com, look for 'Audited Suppliers' who offer customized concentrations to optimize your shipping weight-to-value ratio.

Always use Secured Payment terms or Letters of Credit (L/C) for large volumes. Ensure the HS Code (293190) is correctly declared to avoid customs delays or fines. Before finalizing the contract, confirm the supplier's Export License for hazardous chemicals to ensure the goods can legally leave the country of origin.