Mould-making and casting are central techniques in the history of art and design. Their uses and applications have long been varied, and they still play an important role today in both artistic production and industrial manufacturing.

In the art world, moulding and casting have served as tools for sculptors and other creators. But these processes also play vital roles beyond fine art, in fields such as scientific research and large-scale industrial production — from automotive manufacturing to household goods. Many of the decorative and everyday objects you use were made through moulding techniques.

Read on to learn more about the techniques, uses, and history of mould-making and casting.

What is a Mould?

A mould is a block containing a hollow cavity in a desired shape. Casting is the process of forming a liquid or pliable material — which could be plastic, glass, metal, clay, epoxy, concrete, plaster, and more — poured into the mould. The liquid solidifies inside, adopting its shape. The result is a solid object, a process also known as casting. To help remove the hardened piece, a release agent is usually applied to prevent sticking.

A global industry exists around skilled manufacturers and sculptors who create the tools and machinery required for mould-making. Key components include furnaces and kilns, found in foundries that produce metal cast parts.

Two Basic Casting Techniques

1. Bi-valve casting
This method uses two moulds, one for each half of the object. Unlike disposable moulds that must be broken to release the cast, bi-valve moulds can be reused multiple times.

2. Multi-part moulding
This process uses several interconnected moulds, each forming a section of a more complex and valuable cast. It allows for multiple reproductions.

The Art of Mould-Making: A Prehistoric Skill

Mould-making dates back over 6,000 years — meaning our prehistoric ancestors practiced the same craft we can pass on today.

The earliest known cast object is a copper frog from around 3200 BCE in Mesopotamia. The discovery of molten copper followed earlier work with naturally occurring gold and silver. Early humans, already familiar with pottery, combined their clay-forming knowledge with molten metal to create metal forms using clay, sand, or stone moulds.

Archaeologists have also found stone moulds used to produce axes around 3000 BCE. These were likely two-part moulds tied together with a rope, with a pouring hole for the molten metal. Many prehistoric weapons were made by casting — a process crucial to early survival and cultural development.

Casting in Ancient Civilizations

Egyptian funerary practices used a vast range of cast objects — from jewelry and household tools to sculpture. Casting techniques also developed across the Near East and Far East, later spreading into Europe.

Early Greek bronze sculptures were initially simple and hammered into shape from separate sheets joined by rivets. Artists then advanced to lost-wax casting, producing large-scale bronzes by casting each body part separately. The wax-covered clay core method enabled detailed and uniform results, with air vents allowing gas to escape during pouring.

During the Roman era, Greek statues remained highly valued. Roman artists created plaster moulds of Greek bronzes to reproduce them in marble or bronze. These copies — decorating public spaces like theatres and baths — are now crucial historical evidence, since many original Greek bronzes were melted down.

In the Renaissance, Florence became a hub for sculpture and foundry innovation. The sculptor Donatello completed his bronze masterpiece David around 1430, considered the first major bronze statue of the Western Renaissance — supported by the growing technical sophistication of 15th-century foundries.

Moulds in Culinary Design

Moulding has never been limited to art.

By the 17th century, elaborate “luxury jellies” were made using decorative moulds. The English chef Robert May, in his 1660 book The Accomplisht Cook, instructed readers to shape jellies using shells and ornate forms. These moulds were later crafted in glass, brass, or tin, combining practicality with aesthetic delight.

Design and Casting in the 19th Century

Casting played a major role in the arts of the Industrial Era. As new technologies enabled mass production, design reformers feared a decline in public taste.

Ceramics and Glass

One of the oldest uses of casting was in ceramic and glass production, creating tableware and vessels.

Slipcasting, still common in ceramics, involves pouring liquid clay (slip) into plaster moulds — especially for shapes difficult to throw on a potter’s wheel. The resulting piece is fired in a kiln for final hardening.

In the 20th century, industrial design and moulding technologies expanded dramatically during World War II, particularly in the United States, to support wartime manufacturing. After the war, these advances were redirected into the plastics and injection moulding industry, fueling mass production of affordable goods.

Today

Mould-making and casting techniques remain essential for manufacturing nearly everything we use — from the structural components of our buildings to everyday consumer products.

In today’s postmodern art world, artists have also begun reinterpreting moulds as aesthetic and conceptual tools, exploring themes of reproduction and authorship. Sean Hunter Williams is one contemporary artist who features mould-making as a key part of his creative process.