2-Mercaptopyridine n-oxide
CAS 1121-31-9
EC 214-329-4
Formula C5H5NOS
MW 127.16 g/mol
Heterocyclic Compounds Personal Care & CosmeticsWater TreatmentPharmaceuticals & HealthcareCoatings, Adhesives, Sealants & Elastomers Preservation & BiocideFoam Control
Description
2-Mercaptopyridine N-oxide (CAS 1121-31-9) is a heterocyclic organosulfur compound commercially known as Pyrithione or Omadine, also referred to by the abbreviation 2-PNO. It carries no assigned E-code and is identified under EC 214-329-4 with molecular formula C5H5NOS.
In personal care formulations, it functions as an antifungal and antibacterial active by disrupting membrane transport in target microorganisms, making it a standard active in anti-dandruff shampoos and scalp treatments. In industrial coatings and water treatment systems, it inhibits microbial growth in recirculating water and wet-state paint formulations by interfering with cellular metal ion uptake.
The compound is supplied as an off-white powder and is subject to REACH registration requirements for EU market entry. Procurement should confirm biocidal product compliance under BPR (EU 528/2012) for relevant end uses. Packaging formats and minimum order quantities are available on request.
In personal care formulations, it functions as an antifungal and antibacterial active by disrupting membrane transport in target microorganisms, making it a standard active in anti-dandruff shampoos and scalp treatments. In industrial coatings and water treatment systems, it inhibits microbial growth in recirculating water and wet-state paint formulations by interfering with cellular metal ion uptake.
The compound is supplied as an off-white powder and is subject to REACH registration requirements for EU market entry. Procurement should confirm biocidal product compliance under BPR (EU 528/2012) for relevant end uses. Packaging formats and minimum order quantities are available on request.
Physical Properties
| Melting Point | 70-73 °C |
| Boiling Point | 350.2±15.0 °C(Predicted) |
| Density | 1.255 (estimate) |
| Appearance | off-white powder |
| Color | Off-white to beige or yellow to yellow-greenish or grayish-green |
| Form | Powder, Crystals, and/or Chunks |
| Refractive Index | 1.5480 (estimate) |
Safety & Handling (Learn More)
Danger GHS06 GHS07
H
H301H315H319H335
P
P261P264P270P271P280P319P321P330P405P501P264+P265P301+P316P302+P352P304+P340P332+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 29333990 |
| WGK (Germany) | 3 |
Other Names
1-hydroxypyridine-2-thionePyrithionePyridinethiol N-oxidepyridine-2-thiol N-oxideOmadine2-Pyridinethiol 1-oxide2-Pyridinethiol N-oxide
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