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emra per vajza me shkronjen g; used mizuno irons jpx. Jul 19, 2020 - This Pin was discovered by Louis PJ. Discover (and save!) your own Pins on Pinterest. This is why slumping molds usually have a hole or two in the bottom. It's to allow air out so that it doesn't cause the glass to puff up from trapped air creating a bubble underneath it. In the end, I wasn't happy with it and felt that the fiberboard wasn't quite thick enough to provide enough depth to the design this way. Ceramic mold casting, also known ambiguously as ceramic molding,  is a group of metal casting processes that use ceramics as the mold material. It is a combination of plaster mold casting and investment casting.   There are two types of ceramic mold casting: the Shaw process and the Unicast process. .