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Sodium pyrithione
Nanjing Hongzun Chemical Plant Co., Ltd.

Sodium pyrithione(SPT)
Item Index
Appearance Amber liquid
Assay 40~41%
Packing & Storage
Packing in 25kg / 250kg plastic bucket
Storage 20℃, 2 years.
Shipping Room temperature in China; may vary elsewhere
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General information
Chemical & Physical Properties
Safety Information
Synthetic Route
Common Names Sodium pyrithione | SPT | 1-hydroxy-2(IH)-pyridineselonato sodium
CAS No. 3811-73-2 Boiling Point (℃) 109 °C
Molecular Weight 149.146 Melting Point (℃) '-25 °C
Appearance Amber liquid Vapor Specific Gravity 1.22
HS Code 2933990 Flash Point (℃) 107.3ºC
Solubility Insoluble in water Autoignition Temperature (℃)
Safety Phrases S26-S36-S24/25-S37/39
RIDADR NONH for all modes of transport
WGK Germany 3
Packaging Group
Hazard Class
Inhalation Cough. Sore throat. Use local exhaust or breathing protection. Fresh air, rest.
Skin Redness. Burning sensation. Itching. Protective gloves. Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes Redness. Pain. Wear safety goggles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.
Ingestion Abdominal pain. Nausea. Vomiting. Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.

Using pyridine as raw material, water as solvent, in the presence of catalyst, using hydrogen peroxide as oxidant, the synthesis of pyridine nitrogen oxide; Then the pyridine nitrogen oxide and organic solvent mix, and then add surfactants, curing agents and alkali reagents, reflux water separation, after the reaction system water separation, temperature rise pressure reaction, synthesis of pyridine thione sodium

Frequently Asked Questions

Physical and chemical properties
The pure product of sodium pyrithione is a white or off-white powder, easily soluble in organic solvents such as water and ethanol. It is generally configured as a 40% solution, which is light yellow to yellowish brown transparent liquid, easily soluble in water. When used under acidic conditions, the persistent effect decreases, and it is stable under alkaline or neutral conditions.

Sodium pyrithione belongs to pyridine derivatives fungicides, the appearance is yellow and light brown transparent liquid, the melting point is 250 ℃, and it has a slight characteristic smell. Soluble in organic solvents such as water and ethanol. Unstable to light, oxidizing agents, and strong reducing agents. Non-ionic surfactants will slightly inactivate it, and it can chelate with heavy metals. The main application areas include: daily chemical products, adhesives, papermaking, medicine, pesticides, leather products, disinfection supplies, etc.

Application field
SPT is mainly used for anti-mildew and anti-bacteria products in daily chemicals (shampoo and hair care products), architectural coatings, adhesives, sealants, pesticides, textiles, leather products, and metal processing fluids. It can also prepare products such as disinfectants, detergents and medical broad-spectrum antifungal dermatology drugs. At the same time, it is an effective fungicide for fruit trees, peanuts, wheat, vegetables and other crops and an excellent disinfectant for silkworms. SPT and its similar products are widely used in related fields due to their superior performance of high efficiency, broad spectrum, and low toxicity.