Overview
Zinc pyrithione (CAS 13463-41-7 ), commonly abbreviated as ZPT, is a broad-spectrum antimicrobial agent used across personal care, coatings, and industrial water treatment applications. Known also as zinc pyridinethione, it controls fungal and bacterial growth in formulated products and process systems.
In antidandruff shampoos and scalp treatments, ZPT is the active ingredient that controls Malassezia yeast, making it one of the most established actives in OTC haircare. Marine and architectural coatings rely on it as a biocidal additive.
This additive helps to prevent algae, mold, and mildew growth on exterior surfaces. Adhesives, sealants, and elastomers incorporate ZPT to extend product shelf life and resist microbial degradation in humid or outdoor environments.
Industrial water treatment systems use it to suppress microbial fouling in recirculating and process water circuits. Zinc pyrithione is supplied primarily as a white to off-white powder and as aqueous dispersions.
These dispersions are typically provided at 48% active content. Standard grades include technical and cosmetic-grade specifications, with cosmetic-grade material subject to purity requirements aligned with regional regulatory limits.
These limits apply specifically to leave-on and rinse-off formulations. Drum and IBC packaging are standard for bulk procurement, ensuring safe handling and efficient transport for large-scale industrial and manufacturing operations.
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Physical Properties
| Melting Point | 240 °C (decomp) |
| Density | 1.782 g/cm³ @ Temp: 25 °C |
| Color | White to Orange to Green |
| Odor | Mild Characteristic |
| Form | Powder |
| Water Solubility | Insoluble (<0.1 g/100 mL at 21 ºC) |
| Vapor Pressure | 0Pa at 25℃ |
| Log P | 0.9 at 25℃ and pH7.5-7.7 |
Safety & Handling
Danger GHS05 GHS06 GHS08 GHS09 GHS07 Hazard Statements H301 Toxic if swallowed H302 Harmful if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H330 Fatal if inhaled H331 Toxic if inhaled H332 Harmful if inhaled H335 May cause respiratory irritation H360 May damage fertility or the unborn child H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29419000 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | II |
| Storage Class | 6.1A - Combustible acute toxic Cat. 1 and 2 very toxic hazardous materials |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 13463-41-7
- EC Number
- 236-671-3
- Mol. Weight
- 317.7
- HS Code
- 29419000
- Category
- Salts & Minerals