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How to make metal molds

Updated April 17, 2017

Metal moulds can be made with many kinds of metal. However aluminium, iron, brass, bronze, and stainless steel are most common. Metal moulds can be used to cast many different materials, including plastic, concrete, cement, and other types of metal. The term casting is used when a liquid form of a material is poured into a mould. Making metal moulds is not as difficult as most people might think. The moulds can be designed and completed using simple techniques.

Wash, and dry your moulding metal in order to remove any residue on it. Remove any nonmetallic pieces, such as crystal or plastic. Leaving residue or nonmetallic materials on the metal may cause a fire.

Place the metal in the crucible.

Melt the mould metal so that it becomes liquid. Mold metal can be melted using a furnace. Metal melts at different temperatures depending on its type. Bronze melts at 927 degrees Celsius, or 925 degrees Celsius. Brass melts at 932 degrees Celsius, or 930 degrees Celsius. Aluminium melts at 649 degrees Celsius, or 930 degrees Celsius. Iron melts at 1536 degrees Celsius, or 1596 degrees Celsius. Stainless steel melts at 1510 degrees Celsius, or 1510 degrees Celsius.

Put the melted metal in a mould frame. Use furnace tongs to handle the crucible. Pour its contents slowly and carefully into the frame. This process is dangerous and should be done with care, and the proper protective gear.

Let the metal mould dry. It is important that it is cooled down for a specific period of time so that it can take appropriate shape. Usually, it takes around two to three days to dry properly.

Tip

Wear protective gear when handling the furnace and metal. Heat resistant, and flame retardant clothing, and gloves should be worn, as well as a protective face mask, and goggles. Keep a fire extinguisher nearby. When working with metal at such high temperatures there is always the risk of a fire.

Warning

Working with a furnace and melted metal in dangerous, there is a serious risk of fire, or burn injury.

Things You'll Need

  • Crucible
  • Mold frame
  • Furnace Tongs
  • Flame retardant clothing
  • Flame retardant gloves
  • Face shield
  • Protective Goggles
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About the Author

Cape Cod-based Nicole Coe has been writing online since 2006. Her articles have been published on various websites. Coe earned an associate degree in language arts from Cape Cod Community College, in Hyannis, Massachusetts. She earned her Bachelor of Arts in English and communications online at Ashford University.