Before we dive into the step-by-step process of making a mold, it’s important to understand the basics of molding silicone rubber. This material is ideal for creating molds of both small and large objects due to its many benefits, including being odorless, non-toxic, tear-resistant, able to withstand extreme temperatures, highly precise in reproducing details, and durable. Now, let’s walk through the method of creating a mold with molding silicone rubber, using a photo frame mold as an example:
Step 1: Prepare and Inspect the Original Model
Before starting, ensure the original model is smooth and free from defects. A flawless model will result in a better mold, as imperfections in the model will be transferred to the mold, regardless of how high-quality the silicone is.
Step 2: Secure the Photo Frame Model
Seal the joints of the frame to prevent silicone leakage. Once sealed, secure the model in the frame to ensure it stays in place during the molding process.
Step 3: Measure, Mix, and De-air the Silicone
For condensation-type silicone rubber, the typical mixing ratio of the two parts is 100:2 (silicone to hardener) by weight. Use an electronic scale to measure the components accurately. After mixing thoroughly, it’s important to remove any air bubbles by performing vacuum deaeration.
Step 4: Pour the Silicone Mixture
Slowly pour one-third of the silicone mixture into the frame, ensuring it seeps into every crevice of the model. After the initial layer is poured, continue to pour the rest of the silicone into the frame, filling it completely.
Step 5: Demold the Finished Mold
Once the silicone has fully cured, carefully remove the model from the mold. Finally, clean and trim the edges of the mold to refine the finished product.
By following these steps, you can successfully create a high-quality mold using molding silicone rubber.