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Sodium pyrithione

CAS Number
3811-73-2
EC Number
223-296-5
Chemical Formula
C5H5NOS.Na
Molecular Weight
149.15 g/mol

Description

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. Contact us for supply of Sodium pyrithione Request Quote

Other Names (Synonyms)

Omadine sodium | Sodium (2-pyridylthio)-N-oxide | sodium (1-oxidopyridin-1-ium-2-yl)sulfanide | 2-Mercaptopyridinen-oxide sodiumsalt | 2-Mercaptopyridine 1-oxide sodium salt | 2-Mercaptopyridine N-oxide (sodium) | 2-Pyridinethiol, 1-oxide, sodium salt (1:1) | 2-Pyridinethiol, 1-oxide, sodium salt | NaPT

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point-25 °C
Boiling Point109 °C
Density1.22
AppearanceClear solution
Colorvery deep brown
FormSolution
Water Solubility54.7 g/100 mL
Vapor Pressure0-0Pa at 25℃
Refractive Index1.4825
Log P-2.38 at 20℃ and pH7

Safety & Handling

Danger
GHS06· ToxicGHS08· Health HazardGHS09· EnvironmentGHS07· Irritant

Hazard Statements

H302Harmful if swallowed
H311Toxic in contact with skin
H312Harmful in contact with skin
H315Causes skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H331Toxic if inhaled
H332Harmful if inhaled
H372Causes damage to organs through prolonged or repeated exposure
H400Very toxic to aquatic life
H402Harmful to aquatic life
H410Very toxic to aquatic life with long lasting effects
H411Toxic to aquatic life with long lasting effects H311+
H331Toxic in contact with skin or if inhaled. H302+H312+
H332Harmful if swallowed, in contact with skin or if inhaled

Precautionary Statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P262Do not get in eyes, on skin, or on clothing.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P330Rinse mouth.
P391Collect spillage.
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P317Get emergency medical help.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off immediately all contaminated clothing and wash it before reuse.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29333990
UN Number3334
Storage Class6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects
WGK (Germany)3