Plaster bandage mold making11/7/2023 When setting accelerators or retardants, etc., are added to the mixture of plaster and water, the hydration of the same and its malleability can be modified, which will prevent the creation of a resistant and durable mold. This can be avoided by gently and continuously stirring the mixture, and adding the dusted plaster little by little. The greater the amount of air trapped, the greater the number of bubbles and the greater the risk factor for the mold to break or crack. This must be done without overdoing it since if the mixture is over-stirred, the dihydrate crystals that have formed can break, deteriorating the crystalline framework, which would result in a less durable mold. The longer the mixing and blending time of the preparation, the greater the resistance. The resistance and durability of the plaster molds increase while the gypsum/water ratio is increased, always taking into account not to impair the malleability of the preparation. The resistance of the plaster base to make molds is based on several elements that we will define below: Gypsum/water ratio Strength and durability of a plaster mold The durability of a plaster mold will be proportional to the quality of the raw material used to make the mold and the care in its manufacturing process. Gypsum is a moldable material, it is a hydraulic binder, used to make different molds through water casting, which gives them a certain porosity. What is plaster?īefore starting to make a plaster mold, you need to learn a little about this raw material and its uses in the pottery industry. However, at present, the development of these molds has been used to advance in the manufacture of a large number of pieces. Making molds with plaster was not widely used by ancient artisans, since for them it was to detract from the value of handcrafted pieces. It is even used to make ornamental pieces or as glue on already made plaster pieces. This process generates a mixture called slip, which is nothing more than the substance that remains at the bottom of the container used to decant the plaster. It is used to make pieces through levigation molding, which consists of dividing the grains of dough by diluting them in water under a decanting system that allows the dough to be purified. When we refer to a plaster mold, we are talking about a multifunctional and easy-to-use mold that allows the production of all kinds of pieces through serial work. ![]() In this interesting article, you will learn how to make these molds in a simple and well-explained way. ![]() For many craftsmen and ceramists, knowing how to make a plaster mold for ceramics is of vital importance when making the pieces you need since they can be applied to any object and are easy to make.
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