Preservatives & Biocides
REACH
Sodium pyrithione
CAS Number
3811-73-2
EC Number
223-296-5
Abbreviation
NaPT
What is Sodium pyrithione?
Sodium pyrithione (CAS 3811-73-2), also known as Omadine sodium and abbreviated NaPT, is a broad-spectrum antimicrobial active.
Where is Sodium pyrithione used?
- Paints, coatings and adhesives: in-can preservative
- Personal care: antifungal active in shampoos and skin care
- Anti-dandruff formulations: targets scalp-related fungi
- Industrial water treatment: controls biofilm formation and microbial proliferation in recirculating and process water systems
- Sealants and elastomers: protects water-borne formulations from bacterial degradation
- It controls bacterial and fungal growth in water-based systems.
Good to know: Cosmetic-grade material meets purity specifications required for personal care and pharmaceutical end uses. Permitted use levels and approved applications vary by region, so buyers should confirm grade suitability against regulatory requirements for their target market.
Commercial specifications
- Aqueous solution, typically 40% active concentration
- Dry powder form for solvent-free handling
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
What are the physical properties of Sodium pyrithione?
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
How is Sodium pyrithione classified and handled safely? Learn More
Danger
GHS06· Toxic GHS08· Health Hazard GHS09· Environmental Hazard GHS07· Irritant
Hazard Statements
H302 Harmful if swallowed
H311 Toxic in contact with skin
H312 Harmful in contact with skin
H315 Causes skin irritation
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.
Which trade and regulatory codes apply to Sodium pyrithione?
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