Copper(II) hydroxide
Copper(II) hydroxide (CAS: 20427-59-2, Cu(OH)2) is an inorganic compound with a molecular weight of 97.56 g/mol. It typically presents as a pale blue to greenish-blue powder. This compound is a key ingredient in certain fungicides and algicides, and it serves as a precursor in the synthesis of other copper compounds. Its applications are primarily in agriculture and industrial processes requiring copper-based reagents.
- IUPAC
- Cupric hydroxide
- Synonyms
- Cupric hydroxide

Fungicide and Algicide
Copper(II) hydroxide is widely used as an active ingredient in agricultural fungicides to protect crops from various fungal diseases. It also functions as an effective algicide in water treatment applications.
Chemical Synthesis
It serves as a valuable intermediate in the preparation of other copper salts and organocopper compounds used in organic synthesis and material science research.
Pigment Production
Copper(II) hydroxide can be employed in the production of certain pigments, contributing blue or green hues to various materials.
| Molecular weight | 97.56 |
|---|---|
| Linear formula | Cu(OH)2 |
| Grade | technical grade |
| Form | powder |
| Solubility | H2O: insoluble(lit.)aqueous acid: slightly soluble(lit.) |
| Contains / stabiliser | stabilizer |
| Composition | Cu(II), 56-57% |



Hazard statements
- H302Harmful if swallowed
- H318Causes serious eye damage
- H330Fatal if inhaled
- H400Very toxic to aquatic life
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P260Do not breathe dust, fume, gas, mist, vapours or spray
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P284Wear respiratory protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | T,N |
| Risk statements (R) | 22-23-41-50/53 |
| Safety statements (S) | 26-39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Copper(II) hydroxide used for?
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Copper(II) hydroxide is primarily used as a fungicide and algicide in agriculture and water treatment. It also serves as a precursor in chemical synthesis for producing other copper compounds and pigments.
What is the CAS number and formula for Copper(II) hydroxide?
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The CAS number for Copper(II) hydroxide is 20427-59-2, and its chemical formula is Cu(OH)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Copper(II) hydroxide in technical grade, typically with a Cu(II) content of 56-57%. TSS does not represent this product as USP, BP, or EP grade.
How should Copper(II) hydroxide be handled safely?
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Copper(II) hydroxide is a danger. It is harmful if swallowed, causes serious eye damage, is toxic if inhaled, and is very toxic to aquatic life with long-lasting effects. Handle with appropriate personal protective equipment (PPE) in a well-ventilated area and avoid release into the environment.
How is Copper(II) hydroxide shipped and exported?
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Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals. Copper(II) hydroxide is packed and shipped according to international regulations for hazardous materials.
How can I request a quote or sample for Copper(II) hydroxide?
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To request a quote or sample for Copper(II) hydroxide, please contact our sales team through the website or by phone, providing your specific requirements.
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