Zinc Pyrithione, abbreviated as ZPT CAS 13463-41-7, is a broad-spectrum antibacterial and antifungal active substance, well-known for excellent inhibition effect on Malassezia which causes scalp dandruff and itch. It is available in two forms: 98% fine crystalline powder and 48–50% aqueous suspension. Powder grade is easy for solid formulation compounding, while liquid suspension saves grinding work and is convenient for direct addition into cosmetic shampoo and liquid systems. TNJ Chemical is the leading manufacturer and exporter since from 2001. We guarantee high quality, competitive price, stable supply, fast delivery and tech support etc. To find more, please contact sales@tnjchem.com
Product Information
Product Name Zinc Pyrithione
CAS No. 13463-41-7INCI Name Zinc Pyrithione
Synonym ZPT, Bis(2-pyridylthio)zinc 1,1'-dioxide, Pyrithione Zinc
EINECS 236-671-3
Molecular Formula C₁₀H₈N₂O₂S₂Zn
Molecular Weight 317.71
Chemphysical Properties
Appearance White or off-white fine crystalline powderOdor Odorless or slight characteristic odor
Melting Point 262℃ (decomposition)
Density (25℃) 1.78 g/cm³
Solubility Practically insoluble in water; slightly soluble in organic solvents
pH (suspension) 6.0 – 8.0
Stability Stable under normal storage; avoid strong oxidants and strong acids
Quality Specification
| Test Item | 98% ZPT Powder | 48–50% ZPT Aqueous Suspension |
|---|---|---|
| ZPT Active Assay (HPLC), % | ≥98.0 | 48.0 – 50.0 |
| Zinc Content, % | — | 9.3 – 11.3 |
| Loss on Drying, % | ≤0.5 | — |
| Residue on Ignition, % | ≤0.2 | — |
| Particle Size D50, μm | — | ≤0.5 |
| Particle Size D90, μm | ≤3.0 (micronized optional) | ≤1.0 |
| Heavy Metal (Pb), ppm | ≤10 | ≤10 |
| Arsenic (As), ppm | — | ≤2 |
| Aerobic Microbial Count, cfu/g | — | ≤100 |
Use & Application
Cosmetic grade zinc pyrithione is the core anti-dandruff raw material for shampoo and scalp care products. It effectively suppresses Malassezia reproduction on scalp, relieves dandruff, scalp itching and flaking problems. The recommended dosage in rinse-off hair care formulas is 0.5~1.0%. It can be compounded with other cosmetic raw materials, suitable for anti-dandruff shampoo, scalp treatment and rinse-off hair products.
Industrial grade zinc pyrithione acts as biocide and fungicide for water-based coatings, adhesives, latex, textile and leather. It prevents mold and bacterial growth, protects materials from mildew, discoloration and degradation during storage and application. It is also used in plastic, paint and wood preservation systems.
Agricultural grade ZPT works as fungicide for crop protection, inhibiting fungi and algae growth.
Packing
25kg fiber drum with inner PE liner; 40% aqueous suspension ZPT available in plastic drum.
Delivery & Storage
Seal tightly and store in cool, dry and ventilated warehouse. Protect from sunlight, high temperature and moisture. Separate from strong oxidizing agents and strong acid materials. Shelf life is 24 months under proper storage.
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