|Monthly Tech-Tip |
Alternate Names: Copper(II) hydroxide, Copper Hydrate, Cupric Hydroxide
This is less reactive than copper carbonate basic and more reactive than cupric oxide (CuO). This material does not contribute to CO2 bubbling in glazes.
Copper Hydroxide has a fairly complex decomposition as it is heated to melting point. Around 185C it loses about 18% weight as it decomposes to the heat stable CuO (cupric oxide) which remains stable until 1000C. Around 1050C about 6.5% is lost, likely involving partial loss of oxygen to form a mix of cuprous and cupric oxides.
Please check the accompanying curve to see the history of weight loss as this is fired (courtesty of Bob Hickerson, World Metal, LLC). You can see how much weight it lost, where it occurs and how fast it happens. Compare this with Copper Carbonate Basic to see the difference.
TGA/DTA curve showing weight loss over temperature rangeTap picture for full size and resolution
Copper Phosphate2Tap picture for full size and resolution
Copper In CalciteTap picture for full size and resolution
Copper Carbonate Basic
This form of copper carbonate is the article of commerce, a mixture of theoretical copper carbonate and copper hydroxide.
Metallic based materials that impart fired color to glazes and bodies.
Copper Compounds Toxicology
|Temperatures||Copper hydroxide decomposes to CuO (185-)|
Copper Hydroxide at Wikipedia
|TGA||See accompanying chart picture|
|By Tony Hansen|
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