Silicone Forms for Stone: Properties and Thunderies

Silicone form – device used for casting products. As a final product coming out of the form, gypsum sockets, moldings, decorative interior inserts and materials imitating wild stones texture.


The main purpose of silicone form is the casting of products, the surface of which repeats or mimics the plane of materials of natural origin. Wherein The form can be used to prepare the foundation of products that serve for the manufacture of new forms.

It is required to prepare semi-finished products. After their withdrawal from it, they need a specific improvement: grinding, restoration of chips, cracks, shells and painting, if necessary.


Silicone forms are the most common devices for casting blanks. Silicone has a wide range of characteristics, which cause efficient production.

This material is soft, elastic and malleable. Smooth silicone surface does not stick to the material. The workpiece placed in the form is easy to extract without damage, which is an important factor in the manufacture of decor.

Casting of products in silicone forms is performed using a liquid solution. Its base consists of two components: plaster (alabaster) and water. To improve high-quality and external characteristics, the mixture is complemented by various additives.

Their presence affects the stability parameters of the product to destructive loads and environmental impact.

Foundry forms made of silicone can be used multiple – it helps to increase the efficiency of the production of products and reduce the cost of purchasing materials necessary for the manufacture of forms.

Silicone material is not subject to negative effects of environmental factors. It does not rot, does not crack, does not destroy under load. Specific types of this material are resistant to high temperatures, which makes it possible to increase the production production of molding products by placing in a special drying.



In order to make a silicone form with their own hands, It is necessary to prepare the following set of materials:

  • Sheet of drywall is at least 50×50 cm in size;
  • Glk 10×40 cm sheet segments;
  • Trimming the metal profile used for mounting plasterboard plates;
  • Self-tapping screws with a wide step of thread;
  • Malyary Scotch;
  • several tubes of suitable silicone;
  • Other concomitant materials.
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Basic assembly

As the basis serves a segment of a plasterboard sheet. It must be put on a flat table or workbench, the plane of which should be smooth. This is necessary to eliminate the deflection of the foundation and its cracking.

On the surface of the plasterboard base, it is necessary to draw with a pencil (marker) and the line of the inner contour of the future form. Ee perimeter can be in the form of a rectangle or square. It is important to take into account the angle between the sides of the figure in the drawing – it should be as close as possible to 90 degrees. This approach will make it possible to make high-quality shape with even walls.

10×40 cm plasterboard segments should be installed along the perimeter of a square or a rectangle, drawn on the base surface. If necessary, you can remove unnecessary protruding parts of segments to get the right figure. These segments will serve as a template.

Board must be consolidated with the help of pieces of metal profile. To do this, the profile from the outer side is applied to the field of boost adjoining, after which it is screwed to the base. The board is attached to it using screws screwed from the inside of the template.

This action is made relative to all four sides.

To eliminate the flow of silicone into the slots between the adjoins of the sides and the foundation, the sickness of the painting scotch is performed on the inside. It is advisable to achieve the lack of scotch folds, as they may affect the appearance of the future form.

So that silicone is not adhesive to the drywall base, it is possible to put a polyethylene film on the bottom of the template. Its size must coincide with the bottom of the template, otherwise silicone partially falls on the basis and stick to it, which makes it difficult to extract the form.

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The next step is to fill silicone. To do this, it is necessary to prepare the surface of a natural stone that will be mimicted by the form.

It must be cleaned from dust and dirt. On the surface there should be no protruding parts, as well as moving elements that could be disconnected during the fill process.

The outlines of the stone must correspond to the parameters of the future artificial material, otherwise the billet, which will be extracted by their shape, will become unsuitable for further use during construction and finishing works.

The height of the stone sample should not exceed the height of the template side – The difference of these values ​​should be at least 5 cm. This will make it possible to form a bottom of the future silicone form, the thickness of which will be sufficient to hold the gypsum material.

Prepared stone stacked on the bottom of the template in the center.

It is important to observe an equal distance from the sides to all edges of the stone, then the form will be symmetric and even.

Application of silicone on the sample is made as follows: With the help of a small spatula, a masticine or plastic blade for plasticine Silicone applied to the surface of the stone. At the same time, attention is paid not to the thickness of the layer of the filler material, but the degree of its penetration into the pores and natural depressions of the stone sample. Silicone literally rubs away in stone texture.

Thus, the coverage of the entire surface of the stone, which is laid in the center of the plasterboard template. After applying the primary layer, the coating of the second layer. It is necessary to accurately fill the larger irregularities of the sample surface.

After that The rest of the template is filled with silicone. In the process of this it is better to use a special gun for silicone tube. The use of such a tool will speed up the process and increase the quality of silicone distribution. The upper part of the silicone mass is aligned with a spatula or plastic blade.

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Then it is necessary to leave a drying form for the period specified in the Silicone Packaging Instructions.

To ensure reliable extraction, you can increase this period by two times, as the instruction is provided for thin layers of silicone application.

Check the degree of drying material in the inner part of the mass can be using a long needle or needle. To do this, go through the form you need before it breaks into the base surface. After removing the needle or needles, you should check the presence of raw silicone signs. If not, it means that the form can be extracted from the template.

Extraction is made as follows: Self-tapping screws, retaining parts of the support metal profile, unscrew. The board of the template is disconnected from the base and silicone form. The form lying on the film litter, turns over. The film is neatly cleaned.

Then, the most important manipulation is made, on which the final quality of the silicone form will depend on, – the sample stone is removed. To do this, around the perimeter of the form produced a gradual disconnection of silicone from the stone surface. The most difficult stage is the separation of the bottom of the sample with the bottom of the “bowl” of the form.

After removing the workpiece from silicone rim, the form is cleared from stone residues and other foreign engines. Air shells arising when pouring, can be pouring silicone so that they are not visible.

After several days of additional drying, a silicone form for the manufacture of stone can be used in.

About how to make a form for a brick casting with your own hands, look in the video below.

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