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Chemical Name: Zinc Dihydrogen Phosphate
Chemical Synonyms: Zinc Phosphate Monobasic; Zinc Bis(dihydrogen Phosphate); Zinc Dihydrogen Phosphate Dihydrate
CAS No.: 13598-37-3
Molecular Formula: H₄O₈P₂Zn (anhydrous basis) / Zn(H₂PO₄)₂·2H₂O (dihydrate)
Molecular Weight: 259.35 g/mol (dihydrate) / 163.37 g/mol (anhydrous basis)
Zinc Dihydrogen Phosphate (CAS 13598-37-3), also known as Zinc Phosphate Monobasic, is a white crystalline powder widely used as the primary salt in zinc-based phosphating baths for steel, iron, and other ferrous metal surfaces. It reacts with metal surfaces under acidic conditions to form a dense, insoluble phosphate conversion coating that significantly improves paint adhesion and corrosion resistance . It is also used as an anti-rust pigment, electroplating additive, ceramic colorant, and flame retardant synergist. Available in industrial grade with consistent Zn and P₂O₅ content.
Parameter | Specification |
|---|---|
Product Name | Zinc Dihydrogen Phosphate |
Synonyms | Zinc Phosphate Monobasic; Zinc Bis(dihydrogen Phosphate); Zinc Dihydrogen Phosphate Dihydrate |
CAS Number | 13598-37-3 |
Molecular Formula | H₄O₈P₂Zn (anhydrous basis) / Zn(H₂PO₄)₂·2H₂O (dihydrate) |
Molecular Weight | 259.35 g/mol (dihydrate) / 163.37 g/mol (anhydrous basis) |
EC No. | 237-067-2 |
Assay / Purity | ≥98% (industrial grade); ≥99% available |
Appearance | White crystalline powder or granules |
Zn Content | ≥19.5% |
P₂O₅ Content | ≥46.0% |
Free Acid (as H₃PO₄) | ≤5.0% |
Grade | Industrial Grade / Technical Grade |
Storage | Cool, dry place, sealed and protected from moisture |
Steel Phosphating (Primary Use): Core salt for zinc-based phosphating baths. Forms a crystalline phosphate conversion coating on steel and iron surfaces, enhancing paint adhesion and corrosion resistance. Widely used in automotive, appliance, and machinery component pretreatment .
Anti-Rust Pigment: Used as a non-toxic anti-rust pigment in alkyd, phenolic, and epoxy coating systems .
Electroplating Additive: Improves uniformity and gloss of zinc and zinc alloy electroplated coatings .
Ceramic & Glass Industry: Used as a colorant and clarifying agent .
Flame Retardant Synergist: Acts as a phosphorus-zinc synergist in intumescent flame retardant systems for plastics and coatings .
Consistent Phosphating Performance: Controlled Zn and P₂O₅ content ensures uniform coating formation and reproducible bath life.
Cost-Effective Corrosion Protection: Zinc phosphate coatings provide excellent paint adhesion and salt-spray resistance for ferrous metal parts.
Multiple Application Versatility: Suitable for phosphating, anti-rust pigments, electroplating, and flame retardant systems.
Full Documentation: COA and MSDS available upon request.
Hazard Classification: Classified as H302 (harmful if swallowed), H319 (serious eye irritation), and H400/H411 (very toxic to aquatic life with long-lasting effects) per GHS sources .
Corrosive Properties: Contains high free acid and is strongly corrosive in contact with moisture. The dihydrate form is deliquescent and decomposes in water .
Handling: Use in a well-ventilated area. Wear protective gloves, eye protection, and face protection. Avoid dust formation and contact with skin and eyes.
Transport: UN 3077 (Environmentally hazardous substance, solid, n.o.s.) per some SDS sources . Verify with your logistics provider.
Standard Packaging: 25 kg / 50 kg in PP woven bags or fiber drums with inner liners, or customized packaging upon request.
Storage Conditions: Store in a tightly closed container in a cool, dry place, protected from moisture. The product is deliquescent—keep sealed and avoid exposure to humid air .
Shelf Life: 24 months under proper storage conditions.
