Copper Pyrithione (CPT)

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Copper Pyrithione (CPT) is a broad-spectrum, low-toxicity, environmentally friendly fungicide and mildew inhibitor for fungi and bacteria. It appears as a grass-green crystalline powder. It has limited solubility in water and better solubility in organic solvents such as ethanol and ether. It is relatively stable at room temperature but decomposes at high temperatures. It is sensitive to strong oxidants. Direct exposure of Copper Pyrithione to ultraviolet radiation leads to slow decomposition.

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Copper Pyrithione


Appearancegrass-green powder
Density1.65 – 1.85 g/cm3
pH Value6 – 9
Melting point/freezing point265 deg. C Min.
Water solubilityinsoluble

Note: CuPT 37% can be customized.


Copper Pyrithione (CPT) is widely used in consumer paints, adhesives, and carpets. It can also be used in antifouling paints for ships to prevent the attachment of crustaceans, algae, and other marine organisms to the hull.

Due to the low toxicity and stability of CPT, it can be added to paints to provide gel stability and prolong the storage time of the paint.

Copper Pyrithione can also serve as a catalyst for organic synthesis reactions, such as the synthesis of organic sulfur compounds. It has potential applications in industries like papermaking and textiles.

Additionally, Copper Pyrithione has potential uses in the field of energy storage, such as in lithium-ion batteries and supercapacitors.


This substance/mixture contains no components considered to be either persistent, bioaccumulation, and toxic (PBT), or very persistent and very bioaccumulative (vPvB) at levels of 0.1% or higher.

Other hazards:

Copper Pyrithione should be kept away from strong oxidizing agents and acidic substances to avoid dangerous reactions. It may be toxic to aquatic organisms and should not be discharged into water environments. In case of ingestion or inhalation of Copper Pyrithione, medical attention should be sought immediately.

Packing and Storage:

Packed in 25 kg or 250 kg net drums each and stored in tightly closed containers in a cool, dry area. Avoid light. Content is unchanged in two years.


2-Pyridinethiol-1-oxide, copper salt; CuPT; bis(1-hydroxy-1h-pyridine-2-thionato-o,s)copper; Omadine Copper; Copper pyrithione; Cuppic Omadine; CuPT; Cuppic pyrithione.