Making Silicone Molds

2024-12-20 11:23

The casting mold is made from liquid silicone resin, also known as RTV mold. The silicone rubber has excellent chemical stability, self-release properties, and flexibility, and because it has minimal shrinkage, it can effectively transfer fine details from the master model to the mold.

The casting mold is made from liquid silicone resin, also known as RTV mold. The silicone rubber has excellent chemical stability, self-release properties, and flexibility, and because it has minimal shrinkage, it can effectively transfer fine details from the master model to the mold. The mold-making process is as follows:

Tape a flat area around the master model to open the mold later, which will also become the parting line of the final mold.
Suspend the master model in the casting box and place plastic rods to set up gates and vents.
Pour liquid silicone around the master model, expel all air to form a vacuum chamber, ensuring the master model is bubble-free. Then place the liquid material in an oven to cure at a temperature of 40°C. Depending on the volume of the mold, it usually takes 8-16 hours.
Once the silicone rubber has cured, cut open the casting box, remove the master model from the silicone, forming a cavity, and the silicone mold is ready.

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