# Rubber molds and wax injection

> A vulcanized rubber or silicone mold produces many wax copies of a master piece, the basis of serial production of cast jewelry.

- Source: https://www.711grados.com/en/rubber-molds-and-wax-injection/
- Language: en
- Note: This entry was drafted with the help of AI and is pending review by the author.
- Published: 2026-06-26
- Updated: 2026-06-26
- Translation (es): https://www.711grados.com/es/moldes-de-caucho-e-inyeccion-de-cera/
- Author: Sandra Sánchez
- Site: 711 Grados (https://www.711grados.com/)

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To repeat a piece, a rubber mold is made from a master model and wax is injected into it. Each wax copy is then cast by the lost-wax process.

![Steps of the technique: Prepare the master, Build the mold, Vulcanize, Cut, Inject wax, Remove](https://www.711grados.com/media/diagrams/moldes-caucho-steps.en.svg "Summary of the steps")

## From master to mold

The master model (of metal) is placed in a frame with uncured rubber and vulcanized under heat and pressure. The mold is then cut open with a scalpel to remove the model.

## Wax injection

In an injector, the wax is heated and forced under pressure into the mold. It is opened and a replica removed.

## Silicone

For resins, tin or casting waxes, there are room-temperature-curing silicones, cheaper but less heat resistant.

## Use in production

It is the step between the one-off piece and serial production of a jewel.

## Step by step

1. **Prepare the master.** You have a master piece in metal.
2. **Build the mold.** Place the master between layers of rubber.
3. **Vulcanize.** Heat and press in the press.
4. **Cut.** Open the mold with a scalpel.
5. **Inject wax.** Fill the mold with liquid wax.
6. **Remove.** Open and take out the replica.

## Tools and materials

- Vulcanizing rubber or silicone
- Vulcanizing press
- Wax injector
- Scalpel

## Common mistakes

- Badly made cuts: visible lines.
- Injecting at too high a pressure.
- Wax too hot: it sticks.
- Storing the mold carelessly.

## See also

- [Wax carving and modeling](https://www.711grados.com/en/wax-carving-and-modeling/)
- [Casting molds: investment, rubber, silicone and sand](https://www.711grados.com/en/casting-molds/)
- [Centrifugal casting](https://www.711grados.com/en/centrifugal-casting/)