When it comes to composite manufacturing, you can choose from many materials and methods, each with unique advantages. Among the choices, two techniques stand out: the dry process and pre-impregnated (or pre-preg) process. Understanding the differences between the two will help you settle on the most effective way to bring your project to life.

Here, we’re comparing the dry process versus pre-preg to shed light on their characteristics and applications. From cost efficiency to customization to performance, you’ll learn that the dry process is often the best composite epoxy solution. 

What’s the difference? Dry Process vs. Pre-preg Solutions.

Dry process and pre-preg solutions are two common methods for applying epoxy resin to fabric substrates. Each method comes with its own characteristics and applications.

Dry Process

In the dry process, a raw carbon fiber tow or fabric is loaded into a mold and epoxy resin is used to saturate the substrate. The resin then cures, bonding the fibers together to create a solid composite structure.


  • Requires separate handling and application of resin and dry fibers
  • Offers flexibility and customization in material selection and layup techniques
  • Can reduce material waste and enhance performance
  • More cost-effective and compatible with automation compared to pre-preg solutions

Pre-preg Solutions

Pre-preg refers to a composite material where reinforcing fibers are pre-impregnated with a resin before use. This pre-impregnation is typically done by the manufacturer, who applies a precise amount of resin onto the fibers and then cures them to a partially cured state. The pre-preg materials are then stored in a freezer until they are ready to be used. When heated, the resin cures, bonding the fibers together to create a solid composite structure.

  • Characteristics:
    • Reinforcing fibers are already impregnated with resin, simplifying handling and processing
    • Requires freezer storage to prevent premature curing
    • Offers consistency in material properties and performance
    • Typically more expensive than the dry process due to additional processing and handling

Both dry process and pre-preg solutions have their advantages, and the choice between them depends on cost, production volume, and performance specifications. The dry process offers several benefits that make it the best choice for most applications:

  • Cost Efficiency:

The dry process involves lower material costs compared to pre-preg solutions. Pre-preg materials are often more expensive due to additional processing and handling.

  • Customization:

The dry process allows for easier and faster customization and flexibility in material and techniques. You can tailor the resin type, fiber orientation, and layering technique to meet specific requirements and optimize the finished product. 

  • Reduced Material Waste:

 With pre-preg solutions, unused or excess material can lead to waste due to limited shelf life, resin wasted in pattern cuts, and storage requirements. In dry processing, the fibers and resin are combined in the mold as needed, which reduces waste and limits your environmental impact.

  • Improved Handling and Storage:

Dry materials are easier to handle and store than pre-preg solutions, which require storage in freezers. This simplifies logistics and reduces the risk of material degradation during transportation or storage.

  • Faster Production Times:

Pre-preg solutions require additional processing steps and curing time, while dry processing offers faster cycle times and increased efficiency. The dry process allows you to streamline production without compromising quality.

Copps Industries Composite Epoxy Solutions

If you want to streamline your production processes, enhance product performance, and reduce costs, consider dry processing as the ideal composite epoxy solution. From cost-effectiveness and customization to enhanced performance, it offers benefits across a range of applications. 

Copps Industries offers a range of standard and custom epoxy resin systems designed to meet your needs. Whether you need assistance with formulation selection or a solution tailored specifically to your project, we’re here to help. Contact us to place your order or request a quote. 

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