The binder can be a material which can be volatilized at a temperature in the range of from about 100 C. to about 650 C., more preferably in the range of from about 200 C. to about 450 C. and most preferably in the range of from about 250 C. to about 350 C. and can be a polymer such as acrylics, polystyrene, polyvinyl alcohol or trimethylbutanol.