A Ring Pellet (also called ring sizer, or ring stopper, shrinkage stopper), is a special pellet or plug that is placed inside the ring shank during firing to control the size. The pellet is made from a special material that does not shrink or burn during firing. As the metal clay sinters, it shrinks tightly around the pellet so the ring is the exact diameter of the pellet after firing. After cooling, the ring is put into water to dissolve the pellet.
With this mould you can cast your own Ring Sizers as and when needed. A half sized mould creates one pellet of each half size from H-X (4 to 12 in US sizes).
We recommend you use our smooth Silica Free Casting Powder to cast ring pellets - just mix and pour into the mould.
HOW DO I USE THE RING SHRINKAGE STOPPER?
- Make your ring as normal (please consult the clay manufacturer's instructions to figure out how many sizes it shrinks when fired, silver clay can shrink anything between 7-25% depending on brand and type). Don't build your ring directly on the Ring Sizer Pellet.
- Cast your ring pellet to the desired size.
- Once the ring and the pellet is fully dried, place the ring stopper pellet inside the ring and fire as per the silver clay's recommended firing schedule.
- After it’s fully cooled, place in a container of water to dissolve the pellet.
*Do not quench the ring when hot! If the pellet is hot and the water is cold, a potentially dangerous thermal shock can occur*CARING FOR YOUR MOULD
Mould includes 9 Half Sizes of Pellet, from H-X (4 to 12 in US sizes).
I made a plaster cast of the sizes in order to make porcelain rings. This worked really well. It would be great if they did the same mould in larger sizes too.