Mold material 

All for making molds, polyester resins, lamellar resins, occlusion resins, silicone for molds, silicone for hotels, thermal silicone, fibers, rollers, scales, and a long etc ...

Technique
Inside it is poured the fluid or plastic material - molten metal, concrete, plaster, resin, silicone etc. - that when it solidifies it acquires the shape of th...

All for making molds, polyester resins, lamellar resins, occlusion resins, silicone for molds, silicone for hotels, thermal silicone, fibers, rollers, scales, and a long etc ...

Technique
Inside it is poured the fluid or plastic material - molten metal, concrete, plaster, resin, silicone etc. - that when it solidifies it acquires the shape of the mold that contains it. Once the mold has been removed, the piece obtained is normally reviewed, correcting any imperfections in the coupling areas, removing the remains deposited in the holes made to introduce the plastic material, and in the exit holes of the surplus or vents .

To attach the pieces of a mold usually used the keys, which are incisions in one part and projections in the other, which serve for its subsequent adjustment.

It is used profusely to obtain molded pieces, both in art - busts, figures, columns - and in construction - balusters, coatings - or in various industrial processes - ceramic objects, making chocolate bars, etc.

In industry, the mold where the molten material is poured is called a matrix. In construction, the mold, with the set of auxiliary parts, is called formwork.

Types of mold
There are rigid and flexible molds; the molds depend on the shape of the piece to be cut, determined by the degree of complexity of the details and the symmetry of this, being important to facilitate the demoulding that should be as accurate as possible; There are molds in one piece, two pieces or up to five or more if necessary.

Generally, a flexible mold (latex) is mounted with a rigid counter-mold or "mother" that holds the shape avoiding its deformation (plaster). The advantage of flexible molds is to allow them to be demolished more delicately, ensuring a better result of the piece; In addition, it is lighter and more durable.

Molding and unmolding stages
   First you have to think that the piece is not caught in the process of applying the mold on the piece, especially if this mold is rigid, as in the case of the plaster mold. This stage is called "the study of cuts". The mold that requires more creativity is the ceramic, to apply slip (liquid clay), because you can not force the mold in the demolding process, otherwise, the piece will fail; In addition, you can not make the mold with latex, because the clay has to yield moisture to the plaster, which in the dry state is absorbent.
   Fix the divisions, which can be made of clay, galvanized sheet, thick celluloid or putty for glass (if the surface is hard like plaster, because on clay it slips).
   Apply the mold, which can be latex, rubber, plaster or chamotte (clay subsequently pulverized). Each specialty has its difficulties, the plaster should be applied with whiplash and measure the degree of setting of the same; the rubber can only be applied with a special machine that presses the rubber on a rigid surface; Latex should have a more careful application and can not be worked when it starts to freeze. The advantage of the latter is that they can record even the smallest details, including a fingerprint.
   The counter mold is used to join several small parts of the mold.
   The demolded, or process of removing the parts that captured the model created by the artist.
   The cleaning of the mold, to remove all cracks or excess of the mold, and apply some substance so that this mold does not stick with the final work. If the cast is plaster, add detergent, liquid soap or floor wax; if the casting is made of resin, a release agent or liquid release agent is applied; if it is for bronze, you have to do a previous casting of wax, to remove the final mold, this method is called "lost wax"
The molds can be used to make unique works or serial pieces, as is the case of jewelry or the serial industry of toys and other articles of daily use. It can be employed in industry and the arts.

Molds are also usually considered molds for printing coins or spoons, but the most correct name for these molds is the matrix.

Sources: https://es.wikipedia.org/