PMC 3 is great for those looking to make beautiful jewelry and work easily with silver metal clay. PMC 3 consists of 85% fine metal and 15% binder by weight. This variety of silver clay shrinks 12-15% during firing. PMC 3 is different from PMC standard because it contains smaller metal particles. Because it has smaller metal particles, it provides you with a higher metal content and therefore less shrinkage and firing time can be as short as ten minutes.