ZnPT (Zinc pyrithione)

Basic Info:

  • Chemical Synonym(s): Zinc pyrithione; 2-Pyridinethiol 1-Oxide Zinc Salt; Mercaptopyridine N-oxide zinc salt; 2-Mercaptopyridine N-oxide zinc salt; Pyrithione zinc; 1-Hydroxypyridine-2-thione zinc salt; Bis(2-pyridylthio) Zinc 1,1'-Dioxide;
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  • CAS Number: 13463-41-7
  • Chemical Formula:


  • MSDS: Download


Melting Point
approximate 240℃
1.782 g/cm3(Temp: 25 °C)
Water Solubility
Insoluble (<0.1 g/100 mL at 21 ºC)
Boiling Point
253.8ºC at 760 mmHg
Flash Point
Water Solubility
Vapor Pressure
0.00275mmHg at 25°C
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ZnPT (Zinc pyrithione) is an active ingredient in anti-dandruff shampoos that helps control the symptoms of dandruff.

It is an active ingredient in anti-dandruff shampoos that contains zinc pyrithione and is often combined with salicylic acid or selenium sulfide.

It is an antifungal agent that reduces the scalp's itching, peeling, flaking, and redness. It has no anti-dandruff effect by itself.

It is more effective than salicylic acid in treating dandruff but is more irritating to the scalp.


ZnPT (Zinc pyrithione) is a good fungicide and algaecide. Its best-known use as an antifungal agent is in treating dandruff and seborrheic dermatitis caused by Malassezia furfur, which also includes ringworm, scabies, and rosacea.

It can effectively care for hair, slow down the aging of hair, and control the production of gray hair and hair loss.

Because of its extremely low solubility (about 8 ppm), it can also be used to prevent mildew or algae in outdoor paints, but it cannot be used in paints cured with carboxylic acid metal salts.

It decomposes slowly under UV radiation, so it can maintain good efficacy for a long time even under direct sunlight.

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