Casting in Single and Two-Part Molds

The casting procedure will vary depending on the technique used for making the mold. Casting a single piece mold is easier than a multi-part one, but the results will definitely be up to the mark.

The simplest process of mold making is to cover the model with an appropriate mold making material and let it set properly. Once cured and demolded, the covering will reveal a negative impression of the model complete with all the grooves, nooks and other details.

Different techniques of making molds – such as block, blanket, glove, poured, slush, etc. – can be used depending on the type of model and choice of materials. A model that is too floppy, has undercuts or does not have a flat bottom will even require the mold to be made in two or parts, called a multi-part mold.

Irrespective of the method and type of mold, once it is ready it is time to make the positive through the casting process. Here, the actual procedure for casting will vary depending on whether it is a single or multi-part mold.

Single mold casting – Casting in a single piece mold is quite easy. All that the artist has to do is mix the casting material of choice and pour it into the mold. The cast will set in some time and can be demolded before allowing it to cure completely. Care will have to be taken about applying a release agent, eliminating air bubbles and the like. However, the process still remains straightforward and the cast will be ready once it is finished and polished properly.

Multi-part mold casting – Making a mold in two or parts is definitely a complicated and time-consuming process. It follows that the casting process will not be simple either.

The process begins with aligning the different parts of the mold based on the keys. Once the mold comes together properly, it should be secured using heavy-duty bands. Backing boards will also be required in case the mold is flexible.

After securing the mold, the casting material can be mixed and poured into the mold through the sprue or air hole. Care is required again to ensure that the mold is full of the casting material and it reaches every indentation and undercut of the mold. Applying a release agent and eliminating air bubbles is obligatory yet again.

The cast is then allowed to set inside before removing the bands and pulling the mold parts apart. The cast can be removed and allowed to cure further. Cleaning, finishing and painting can be done as needed.

In sum, the techniques for casting in single and two part molds may be a bit different, but the final cast will definitely not leave anything wanting as long as the procedure is properly followed.

Once the cast is ready, it can be displayed or used as planned. Even the mold can be used to make multiple casts if it is not torn down when demolding the cast.

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