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How to Build Strong Parts Using Vacuum Infusion

Tech Tips on the Vacuum Infusion Process

You’ve probably heard a lot about closed molding processes being used to build boat hulls, hardtops, and other marine components. But how do you know which process is best for building strong parts with greater consistency?

“One way is the Vacuum Infusion Process,” said Marcy Offner, Director of Marketing Communications, Composites One.

According to Offner, vacuum infusion uses vacuum pressure to drive resin into a laminate, ultimately resulting in parts with very high fiber content, high strength and high stiffness to weight ratios. “With vacuum infusion, manufacturers also gain the environmental and workplace advantages that come from using closed mold processes, such as reduced emissions and improved employee retention rates,” said Offner.

Since vacuum infusion does not require an investment in special tooling, manufacturers can make the move to this process more easily. Standard tooling can be used as long as it will hold a vacuum and the flange is wide enough to seal the bag. That makes it possible for manufacturers in the marine, aerospace, wind energy and other industries to build large, complex parts at a reduced cost.

Helping manufacturers ensure successful outcomes with vacuum infusion is the team at Composites One. “Our Technical Experts will work with customers on all the details involved, from viscosity of the resin and permeability of the laminate, to vacuum level, and other factors,” said Offner.

One of the most important factors to consider is choosing the right reinforcement. Options include:

  • Fiberglass – the most common reinforcement used with vacuum infusion.
  • Carbon fiber and Kevlar® – often used for projects that require higher strength, stiffness, or toughness.
  • Infusion-specific reinforcements – which offer high permeability, allowing resin to flow easily throughout the mold.

What’s more, it’s easier than ever before for marine manufacturers to find everything they need from a single source. That’s because Composites One is now the leading distributor of Aerovac Process Materials in North America. With locations worldwide, Aerovac develops, manufactures, supplies, and supports innovative vacuum bagging and process materials for customers who demand the best for vacuum infusion.

Both Composites One and Aerovac are members of the Closed Mold Alliance, a group committed to helping manufacturers transition seamlessly to vacuum infusion and other advanced processes.

For more information about vacuum infusion and other closed mold processes, please go to compositesone.com.

Composites One


North America’s leading distributor of composites materials, Composites One provides thousands of products from 700 of the industry’s top suppliers through the most knowledgeable technical sales, technical support, and customer service force in the industry. The company also offers closed mold technologies, process enhancement guidance, regulatory assistance and technical support.

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