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PMC Sterling

PMC Sterling combines microscopic particles of metals in the proportions of 92.5% silver and 7.5% copper- which are the same proportions as traditional Sterling Silver.

The metal powders are mixed with water and a non-toxic binder to create a material that can be worked as easily as modelling clay or other types of Precious Metal Clay.

Download our guide to handling and firing PMC Sterling

Tools

You can use any metal clay tools, textures and stamps however, these should be cleaned thoroughly to avoid cross contamination if working with other types of metal clay.

Alternatively, use a separate toolkit for working with PMC Sterling.

Working and shaping the clay

Work and shape the clay in the same way you would any other type of Precious Metal Clay.

PMC Sterling slip/paste can be made by mixing in some water to create a yoghurt-like consistency.

Once you have created your piece allow it to dry thoroughly before firing in a kiln.

PMC Sterling has a shrink rate of 15%-20%.

Firing

Due to the copper content PMC Sterling requires a unique, 2-step, firing process.

You will need a temperature controlled kiln such as an Evenheat kiln and a torch

PMC Sterling requires a 2 step firing process:

Step 1: Heat the piece with a torch until the binder has burnt off.

Step 2: Place in a kiln and fire at 800C for 30 minutes in a stainless steel pan with carbon. PMC Sterling shrinks 15% during firing.

Additional Information

PMC Sterling can be soldered with any silver solder grade. It can also be enamelled and plated. You may set stones as required providing they can withstand high temperatures for sustained periods.

The melting point of PMC Sterling after firing is 893˚C or 1640˚F