Product Description
Zinc phosphate（CAS#7779-90-0） is an inorganic zinc‑based compound with the molecular formula Zn₃(PO₄)₂ and a molecular weight of 422.12 g/mol. It occurs as an odour‑free fine white powder and features excellent chemical stability alongside extremely low water‑solubility. Synthesized from phosphoric acid, this substance delivers reliable cathodic protective performance and finds broad utilisation across coating, dental and metal‑surface treatment sectors.
Core Chemical Properties
| Melting point | 900 °C (lit.) |
| density | 4.0 g/mL (lit.) |
| vapor pressure | 0Pa at 20℃ |
| solubility | H2O: insoluble(lit.) |
| form | Powder |
| color | White |
| Odor | Odorless |
| Water Solubility | Insoluble in water |
| Merck | 1,410,151 |
| Solubility Product Constant (Ksp) | pKsp: 32.04 |
| CAS DataBase Reference | 7779-90-0(CAS DataBase Reference) |
| EPA Substance Registry System | Trizinc phosphate (7779-90-0) |
Safety Information
| Hazard Codes | N |
| Risk Statements | 50/53 |
| Safety Statements | 60-61 |
| RIDADR | UN 3077 9/PG 3 |
| WGK Germany | 2 |
| RTECS | TD0590000 |
| TSCA | Yes |
| HazardClass | 9 |
| PackingGroup | III |
| Toxicity | LD50 intraperitoneal in mouse: 552mg/kg |
Product Applications
Anti‑corrosion pigment for primer coatings
It serves as a high‑performance anti‑corrosive additive in primer systems, offering efficient cathodic protection to slow down metal substrate corrosion.
Metal conversion coating treatment
It is widely adopted for conversion coating processes for steel, aluminium and various alloy materials, improving surface adhesion and anti‑rust capacity of metals before subsequent painting operations.
Dental materials
Zinc phosphate can be formulated into dental cement for clinical dental applications.
