Reverse Osmosis Antiscalant CAS#: Mixture (Main active: HEDP, CAS 2809-21-4)
Excellent Scale Inhibition Performance: Reverse osmosis antiscalant can effectively inhibit the crystallization and precipitation of calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate and calcium fluoride on RO membrane surface at low dosage, preventing the formation of inorganic scale and maintaining stable membrane flux.
Wide Compatibility & pH Adaptability: It is compatible with most polyamide reverse osmosis membranes and common flocculants. It can work stably under feed water pH ranging from 5.0 to 9.0, suitable for raw water with different hardness and alkalinity.
Versatile Uses: It is widely applied in reverse osmosis pure water systems, brackish water desalination, wastewater reuse RO units, industrial boiler pretreatment, and water treatment for power plants, electronics, food and chemical industries.
Liquid Form & Low Toxicity: Normally supplied as pale yellow or colorless transparent liquid, water-soluble, easy to dilute and dose online by metering pump. It has low corrosivity and does not cause secondary pollution when dosed within recommended range.
Reverse osmosis antiscalant is a blended water treatment chemical, mainly composed of organic phosphonates, polycarboxylate copolymers and dispersants. It can retard crystal growth and disperse suspended particles through threshold inhibition, crystal distortion and dispersion effect. It avoids membrane fouling caused by inorganic scaling, extends the service life of RO membranes and reduces cleaning frequency. Different formulations are available for high hardness water, high silica water and special wastewater systems.
| Chemical Properties | Parameter |
|---|---|
| Appearance | Colorless to pale yellow transparent liquid |
| Main Components | HEDP, polycarboxylate copolymer, dispersant, deionized water |
| Solubility | Fully miscible with water |
| Density | 1.08–1.15 g/cm³ (25℃) |
| pH (1% solution) | 2.0–3.0 |
| Storage temp | Store between 5℃ and 35℃ |
| Stability | Stable under normal storage conditions. Incompatible with strong oxidants and strong alkali at high concentration |
| Viscosity | 5–15 cP (25℃) |
| Recommended Dosage | 2–6 mg/L (based on feed water quality) |
| Safety Information | Content |
|---|---|
| Hazard Statement | May cause irritation to eyes and skin; concentrated liquid may cause slight corrosion |
| Storage | Keep sealed, store in cool and ventilated warehouse, avoid direct sunlight and freezing |
| Handling | Wear chemical goggles, rubber gloves and protective apron. Avoid direct skin and eye contact. In case of contact, rinse with plenty of clean water |
| Waste Treatment | Dilute with large amount of water before discharge, comply with local wastewater discharge regulations |
| HS Code | 38249999 |
This compound is employed as a dedicated scale inhibitor for reverse osmosis membrane systems. It can also disperse iron oxide, aluminum oxide and colloidal particles to reduce composite fouling. It is suitable for single-pass RO, two-stage RO and concentrated water recovery systems. It can replace acid dosing in many scenarios to lower the risk of acid corrosion and simplify operation management.
