We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is Vacuum Casting?

By Jeremy Laukkonen
Updated May 17, 2024
Our promise to you
WiseGeek is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WiseGeek, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Vacuum casting is one of three main pouring methods that can be used to draw materials into molds. A number of benefits can be associated with vacuum casting, many of which make it well suited for work with both ferrous and nonferrous metals. The process typically involves drawing the molten metal up into a mold, which may result in less turbulence and prevent dross and other impurities from entering the final cast piece. Vacuum casting is often associated with a common variation of sand casting, and may also be used with elastomers.

Another name for vacuum casting is counter-gravity filling, since it typically involves drawing a material up into a mold rather than pouring it in from the top. Since the material is not poured or forced in using air pressure, there is typically very little turbulence associated with this method. This can allow the gating mechanisms to be less complex than in other types of casting, which may reduce overall costs.

The simplicity of the gating mechanism can also improve the efficiency of the method, since less metal tends to solidify on it. This may result in an efficiency increase of 50% or more. The final quality of the piece may also be higher, since lower turbulence can result in dross floating freely at the top of the vessel. As the molten material is drawn from underneath the pool surface, the dross will typically be left behind.

Sand vacuum casting is a variation that uses vacuum to form sand to a plastic mold, and it is often used with various types of metal. A thin piece of plastic is typically place on the mold, and then sand is drawn onto it with a vacuum. The sand contacts the plastic sheath rather than the mold itself, but takes on the form of the mold. Molten metal can then be drawn into contact with the sand, at which point it will take on the mold's shape. When the vacuum is removed, the sand will release the solidified metal and the mold can be used again.

Vacuum casting is also used for elastomers if other methods would result in air entrapment issues. This method typically uses a silicone mold that is placed inside a vacuum chamber. A liquid elastomer will then be degassed before being introduced to the mold. Vacuum can help ensure that the elastomer fills any detailed portions of the mold in addition to reducing the possibility of any air bubbles. After the mold has filled, the vacuum can be removed and the piece may be worked on further.

WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.