When you first start working with copper sheet, you will find a dizzying array of gauges available. So what thickness should you start out with?
I think of sheet in terms of its uses, whether that be embossing, shaping, or stamping. Different gauges will be best for each of these.
Gauges and Conversion
In the UK you will almost exclusively find the thickness of copper sheet quoted in mm. In America, it can be quoted in mm, but ‘mils’ is also often used. 1 mil is 0.001 inches. For a quick conversion, I use this chart.
Standard Wire Gauge is the original British gauge used So I have included it here for completeness.
Foil: 0.2mm and below
A sheet thickness of under 0.2mm will have the look and feel of foil. By means of reference, your kitchen foil is around 0.02mm thick. I use foil of 0.15mm for hand embossing techniques. It gives easily under pressure, so the pattern can be basically ‘drawn’ onto the foil. But it needs backing with other materials before being made into jewellery, as it is too thin to support itself.
Sheet for Shaping: 0.5mm-0.8mm
At around 0.5mm, the sheet is holding its own shape well, but is still soft enough to shape easily with pliers. I have used 0.6mm effectively for creating flowing shapes, making cabochons etc. These medium gauges are great for most items except those expected to stand up to heavier wear, such as rings.
Sheet for Stamping: 0.9mm and above
A thicker gauge is needed to accommodate the recess created by stamping. I use 1mm for this purpose, for etching and to make rings.
Copper Blanks
In addition to basic sheet, you can get copper blanks in a wide variety of pre-cut shapes, generally advertised for stamping or enamelling. They are often 1mm thick, so are perfect for stamping or etching and save time cutting the shapes yourself.
Warning: This is just a guide! You may find that you prefer a thicker or thinner gauge than I’ve quoted here. And don’t forget that annealling could make a thicker gauge pliable enough for your project. Experiment and have fun!
