Overview
Sodium pyrithione (CAS 3811-73-2 ), also known as Omadine sodium and abbreviated as NaPT, is a broad-spectrum antimicrobial active used across industrial and personal care formulations.
It controls bacterial and fungal growth in water-based systems where contamination poses product stability or regulatory risks. In paints, coatings, and adhesives, NaPT functions as an in-can preservative.
This prevents microbial spoilage during storage and extends the shelf life of water-based products. Personal care formulators incorporate it into shampoos and skin care products as an antifungal active.
It is particularly effective in anti-dandruff formulations where it targets scalp-related fungi. Industrial water treatment programs use NaPT to control biofilm formation and microbial proliferation.
It is utilized in recirculating and process water systems. In sealants and elastomers, it protects water-borne formulations from bacterial degradation that would otherwise compromise viscosity and performance.
Sodium pyrithione is supplied as an aqueous solution, typically at 40% active concentration, and as a dry powder form for applications requiring solvent-free handling during the manufacturing process.
Technical and cosmetic grades are available, with cosmetic-grade material meeting purity specifications required for personal care and pharmaceutical end uses. Buyers should confirm grade suitability.
Check against regulatory requirements for their target market, as permitted use levels and approved applications vary by region. Ensure all materials meet necessary safety and compliance standards.
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Physical Properties
| Melting Point | -25 °C |
| Boiling Point | 109 °C |
| Density | 1.22 |
| Appearance | Clear solution |
| Color | very deep brown |
| Form | Solution |
| Water Solubility | 54.7 g/100 mL |
| Vapor Pressure | 0-0Pa at 25℃ |
| Refractive Index | 1.4825 |
| Log P | -2.38 at 20℃ and pH7 |
Safety & Handling
Danger GHS06 GHS08 GHS09 GHS07 Hazard Statements H302 Harmful if swallowed H311 Toxic in contact with skin H312 Harmful in contact with skin H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H331 Toxic if inhaled H332 Harmful if inhaled H372 Causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H402 Harmful to aquatic life H410 Very toxic to aquatic life with long lasting effects H411 Toxic to aquatic life with long lasting effects H311+H331 Toxic in contact with skin or if inhaled. H302+H312+H332 Harmful if swallowed, in contact with skin or if inhaled Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. 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. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. 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+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. 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. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. 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.
Trade & Regulatory
| HS Code | 29333990 |
| UN Number | 3334 |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 3 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 3811-73-2
- EC Number
- 223-296-5
- Mol. Weight
- 149.15
- HS Code
- 29333990
- Category
- Catalysts & Catalyst Precursors