The Whole Process of Making Silicone Molds with RTV Silicone

This is a record of the whole process of making silicone molds using RTV-2 platinum cured silicone, which is for beginners who love silicone molds to learn, including the tools and materials used, as well as explanations and precautions for each step.

Homemade Silicone Moulds

1. Tools and Materials

1. rtv-2 silicone: platinum cured silicone (addition silicone).

2. Master mold: The industrial mold is used here.

3. Stirring container: preferably a transparent plastic container with a scale.

4. Stir bar: stir and mix the silicone AB components.

5. Release agent: avoid the silicone sticking to the master mold and making it difficult to separate.

6. Vacuum pump: used to remove air bubbles in liquid silicone.

2. Production steps

Step 1: Place the master mold: Place the spoon model horizontally.

Place the master pattern horizontally

Step 2: Determine the volume: Evaluate the amount of liquid silicone, the easiest way is to use water or fine sand.

Fill the mold with water and pour it from the mold into a measuring cup. A single volume was measured to be 130ml, and the two were the same, so a total of 260ml.

Fill the mold with water

Step 3: Mix the silicone: According to the required amount measured, mix the parts A and B of the liquid silicone in a ratio of 1:1 and stir thoroughly. It is very important to stir evenly, otherwise it will lead to non-solidification, or partially non-solidified phenomenon and cause scrapping.

rtv-2 liquid silicone rubber

Since the operation time of the addition type liquid silicone is only 30-40 minutes, it will begin to thicken and enter the preliminary curing stage, so all operations should be completed within 30-40 minutes.

stirring silicone

Step 4: Pour the silicone: Pour the prepared silicone into the master mold. It is very important that the pouring should be done slowly. This is a small trick to reduce the generation of air bubbles, unless you use a vacuum bubble defoaming treatment.

pour the liquid silicone

Step 5: Curing and separation: Wait about 6-8 hours for the liquid silicone to cure. The curing time of the addition silicone is affected by the temperature. The higher the temperature, the faster the curing. I cured it at room temperature here. Separate the cured silicone from the master mold.

curing and demoulding

Step 6: Trim the mold: Remove the excess corners from the edge of the silicone mold. This operation is very simple.

trim Die

perfect detail reproduction pattern


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