Love Casting

Im revising the process for a product design exam, there is just one bit I dont get.
You have each sides of the moulds on seperate boards, and you have put "green sand" (whats that??) and recycled sand around them.
You then take away the moulds and fixs the two halves together, one has a runner and rinser.
I don’t understand how the sand stays in shape after you have taken away the mould,,, would’nt it collapse? or is green sand special stuff that glues to itself into the shape?
Sos, i ment, put sand around the original pattern that you start with, made from wood, metal, whatever..

sand casting is the mold

Sand Casting: Introduction
Sand Casting is a process by which molten metal is poured in sand molds to … Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, …
www.efunda.com/processes/metal_processing/sand_casting_intro.cfm – Cached

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