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Certificate of Analysis-COA
Premium Grade: Phosphate 47.5% min, Zinc 20.2% min
First-Class Grade: Phosphate 46% min, Zinc 19.5%
| Item | Specification | Result | Single Judgment |
| Appearance | White crystals | White crystals | Qualified |
| Phosphoric acid and phosphates | ≥46.0 | 47.6 | Qualified |
| Zn, ω/% | ≥19.5 | 20.5 | Qualified |
| Free acid (as H₃PO₄), ω/% | ≤5.0 | 3.0 | Qualified |
| Sulfate-free (as SO₄²⁻), ω/% | ≤0.05 | 0.01 | Qualified |
| Lead (Pb), ω/% | ≤0.02 | 0.01 | Qualified |
| Arsenic (As), ω/% | ≤0.01 | 0.01 | Qualified |
Applications
1.Metal Surface Treatment & Phosphating: A key component of zinc phosphating solutions for steel, iron and galvanized surfaces, forming a dense conversion coating that improves corrosion resistance and paint adhesion on automotive parts, fasteners, appliance housings and general metal fabrications.
2.Refractory & High-Temperature Binder: Serves as a chemical binder in refractory castables, ramming masses and high-temperature mortars, providing strong chemical bonding and thermal stability for kilns, furnaces and industrial insulation systems.
3.Corrosion-Inhibitive Coatings: Used as an anticorrosive component in primers and protective paints, contributing barrier and passivation properties that extend the service life of coated metal structures.
4.Flame-Retardant & Wood Treatment: Acts as a flame-retardant additive in polymer formulations and fire-retardant treatments for wood, board and textile substrates, supporting fire-safety requirements in building materials.
5.Catalyst & Specialty Chemical Applications: Functions as a source of zinc and phosphate in catalyst systems, ceramic glazes and specialty chemical processes where consistent purity and solubility are required.
Quality Assurance
Every batch of chemicals leaves our factory with complete laboratory documentation — not a promise, but verifiable test data. From incoming raw material inspection to finished-goods release, each batch is tested against published specifications, and a Certificate of Analysis (COA) accompanies every single shipment. What you order is exactly what we test — and what we ship.
Tested by our in-house ISO 9001:2015 laboratory. Verified independently by third-party labs on request (SGS / BV / Intertek). Traceable from raw material to your warehouse.
Packaging
