About 8g of ETN detonated by about 1/2g AP shoots a penny hammered into a bowl shape through an 8mm thick stainless steel frying pan, and a full apple juice can before making a 1/2 inch wide crater in the concrete. The actual charge was about 11/2in x 3/4in, there was just a lot of clay for tamping.
The little hole at the edge is from when I tried to melt through the pan with 8 ounces of thermite.