Silicone rubber

What is casting rubber?

Reliable product properties, release property and easy processing are just three of the many good reasons to use silicone molded rubber. Regardless of the complexity of the model, silicone rubber allows you to reproduce even the smallest detail. With silicone rubber you can make many casts in which the complex shapes and details of the model are visible.

The advantages of silicone rubber:

• Good chemical resistance
• Excellent reproduction of fine details
• Self-releasing properties
• Processing properties can be adjusted by using different additives, the rubber can be adapted to individual needs.
• Silicone rubber cures at room temperature, the curing time can be accelerated by heating. This can adversely affect the properties!
  and some silicone rubbers are heat resistant up to approx. 250 ° C. For example, Eurosil 50 and Tin sil 70-60 can be used for casting tin (melting temperature ± 230 ° C.)
• Hardness from Shore A 4 to 60 Shore A. Soft rubber, such as 10 Shore A, is ideal for shapes with many small and deep surface details.
• Softer rubber like the silicone gels with Shore OO.

Syntecshop.com has a type of rubber for every application. The choice of a type of rubber depends entirely on the application, and on which surface are you going to pour or brush the rubber. For example, your model can be made of stone, glass, metal, wood, wax, ceramic or plaster.
Then it is also important to determine in advance what material you want to make the casts, for example: plaster, concrete, wax, epoxy, polyester, polyurethane or a low-melting alloy.

This is necessary to avoid problems such as:

• No or poor curing of the silicone
• Surface reaction of the cast final product or the mould
• Mutual adhesion of the materials etc.

So always pay attention and make the right choice, otherwise ask advice from one of our employees or just test the materials before casting!

* The mixing time, pot life and the time to be poured depend on the temperature, the environment and the relative humidity value.

Condensation and Addition silicones

A-SILICONE, platinum cured, Eurosil
By adding a catalyst, the silicone polymers react by means of an addition reaction to a rubber and no volatile by-products are formed. Heating makes it possible to accelerate the curing process. Contact with certain chemicals can partially or completely prevent curing. There is practically no shrinkage, while the cured rubber has good chemical resistance and does not
depolymerizes at high temperatures.

C- SILICONE, tin cured silicone
These silicones harden after addition of the catalyst to a rubber by means of a condensation reaction, while a volatile byproduct evaporates.
Variable processing time and curing speed is obtained by changing the proportion and type of catalyst.
The curing of these products is not sensitive to inhibition (= contamination / reaction of surfaces). C-Silicones have a low shrinkage of approximately 0.5%. The cured rubber can depolymerize when heated in a closed space.