# Casting molds: investment, rubber, silicone and sand

> Casting molds shape metal: investment molds for lost-wax casting, rubber and silicone molds for wax and resin, and sand or graphite molds.

- Source: https://www.711grados.com/en/casting-molds/
- Language: en
- Note: This entry was drafted with the help of AI and is pending review by the author.
- Published: 2026-08-09
- Updated: 2026-08-09
- Translation (es): https://www.711grados.com/es/moldes-de-fundicion/
- Author: Sandra Sánchez
- Site: 711 Grados (https://www.711grados.com/)

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The mold is the structure into which molten metal is poured to give it form. Depending on the casting technique, the mold can be single-use or reusable.

## Investment mold (lost wax)

Made by covering the wax model with a refractory plaster inside a flask; when heated, the wax melts out and leaves the cavity. It is single-use (see [lost-wax casting](https://www.711grados.com/en/lost-wax-casting/)).

## Rubber and silicone molds

Used to make copies in wax (injection) or in resin, tin and pewter. They are flexible and reusable. Vulcanized rubber molds withstand thousands of copies.

## Sand mold

A mix of sand and binder packed around a pattern; used for simple pieces. See [casting](https://www.711grados.com/en/casting/).

## Ingot molds

Of steel or [graphite](https://www.711grados.com/en/graphite-ingot-molds-and-rods/), to cast metal into bar form.

## Care

Keep rubber and silicone molds clean, flat and away from heat and light.

## See also

- [Casting](https://www.711grados.com/en/casting/)
- [Lost-wax casting](https://www.711grados.com/en/lost-wax-casting/)
- [Casting crucibles: types, uses and care](https://www.711grados.com/en/casting-crucibles/)