processes for general shapes

No Bake (Air Set) -In this process, silica sand is mixed with a resin that hardens when exposed to the atmosphere. The process requires no water. It can be used for molds as well as cores. It is applicable to products as small as 20 lb (9 kg), although it is mainly used for large castings weighing up to 20,000 lb (9,100 kg). The no-bake process has become very popular in the past 10 years.