Product Description
Zinc Phosphate (CAS No. 7779-90-0) is an inorganic compound with the chemical formula Zn₃(PO₄)₂ and a molecular weight of 386.11 g/mol for anhydrous zinc phosphate. It typically appears as a fine, white, odorless powder and is characterized by its low solubility in water and good chemical stability.
Zinc Phosphate is widely used as an anticorrosive pigment in protective coatings and primer formulations, where it helps inhibit metal corrosion and improve the durability of coated surfaces. It is also used in selected metal surface-treatment processes and in zinc phosphate dental cement formulations, depending on the grade and applicable industry requirements.
Physical and Chemical Properties
Chemical Name: Zinc Phosphate
CAS Number: 7779-90-0
Chemical Formula: Zn₃(PO₄)₂
Molecular Weight: 386.11 g/mol (anhydrous form)
Physical State: Solid
Appearance: Fine white powder
Odor: Odorless
Melting Point: Approximately 900°C or higher, depending on the reference and measurement conditions
Water Solubility: Practically insoluble in water
Solubility in Other Media: Soluble in acids; behavior in ammonia and ammonium salt solutions depends on solution composition and conditions.
Product Parameters
| 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 |
Application Scenarios
Environmental Exposure Considerations
Prevent the uncontrolled release of Zinc Phosphate into the environment. Spills and discharges should be contained and collected promptly to minimize potential environmental impact, particularly on aquatic ecosystems. Avoid allowing the material to enter drains, waterways, or soil. Handle and dispose of the product in accordance with the applicable Safety Data Sheet (SDS) and local environmental regulations.
Storage and Handling
Store Zinc Phosphate in tightly sealed, clearly labeled containers in a cool, dry, and well-ventilated area. Protect the material from moisture and avoid contact with incompatible substances, including strong acids. Keep containers securely closed when not in use to prevent contamination and minimize dust generation during handling.
Appropriate personal protective equipment (PPE) should be used in accordance with the product's SDS and workplace risk assessment. Collect spills and dispose of residues and contaminated packaging in compliance with applicable local and national regulations.
