Mix and Pour foam offers unique benefits not found in other materials. This polyurethane foam has finished structural properties very similar to polyisocyanurates. It is a closed-cell system, meaning individual cells of foam trap in air and keep liquids out. As a result, it is most frequently used for flotation applications, with the 2lb. density delivering 60 pounds of float per cubic foot. It can be used to fill cavities for reinforcement and insulation, and can be shaped or carved, once cured, for use as a plug in mold-making or sculpting. The 6 lb. density is ideal for filling cavities that will be used to support a heavy load. It is often used to make millwork, floats for wastewater treatment plants, and Coast Guard buoys.

Fibre Glast offers two different densities of mix and pour polyurethane foam to suit your specific application. Explore the benefits and features of both options below.

  • 2 Lb. Polyurethane Mix and Pour Foam

    Fill Cavities for Flotation and Reinforcement
    5 star rating
    This 2 lb. density foam comes as a two-part kit, both parts equally mixed. It is a closed-cell system, meaning...
  • 6 Lb. Polyurethane Mix and Pour Foam

    Higher Density for Strength and Improved Detail
    5 star rating
    This 6 lb. density foam comes as a two-part kit, both parts equally mixed. It is a closed-cell system, meaning...
  • Duratec® Gray Surfacing Primer

    Easy-Sand, Best Choice Primer for Plugs and Molds
    4.6 star rating
    Duratec® Gray Surfacing Primer is the best choice for coating your plug or reconditioning your mold. It is...
  • Quart Mixing Set

    All You Need to Mix a Quart of Resin
    5 star rating
    Simplify your project and let us gather supplies for you. This set contains what you need to mix one quart of resin...
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  • Gallon Mixing Set

    All You Need to Mix a Gallon of Resin
    Simplify your project and let us gather supplies for you. This set contains what you need to mix one gallon of resin...
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  • 5 Gallon Mixing Set

    Supplies for Mixing Gallons of Resin
    Simplify your project and let us gather supplies for you. This set contains what you need to mix multiple five...
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  • Mixing Sticks & Paddles

    Keep a Handful Around the Shop
    Mixing Sticks and Paddles are an easy and effective way to mix resins and gel coat. After each use, simply dispose...
  • Perma-Grit Fine Hand Tools

    Give a Hand-Finished Touch to Laminate Parts
    5 star rating
    Perma-Grit ® Fine Hand Tools are ideal for precise shaping and finishing of the highest quality composi... 
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Mix and pour foam, also known as two-part liquid foam, is a type of foam that is commonly used in composite applications where lightweight and buoyant properties are required. Here are some key aspects of mix and pour foam for composites:

  1. Two-Part System: Mix and pour foam consists of two components, typically referred to as Part A and Part B. These two parts need to be mixed together in the correct ratio to initiate the chemical reaction that creates the foam.
  2. Expansion and Curing: Once Part A and Part B are mixed, the foam starts to expand and cure. The expansion occurs due to the release of gases during the reaction, causing the foam to fill the desired cavity or mold. The curing process involves the formation of a solid, cellular structure within the foam.
  3. Density and Strength: The density and strength of mix and pour foam can vary depending on the specific formulation and the desired application. Different foam formulations are available with varying densities, allowing for customization based on the required strength and buoyancy characteristics. We specifically carry the 2lb and 6lb densities.
  4. Buoyancy and Flotation: Mix and pour foam is often used in applications where buoyancy and flotation are essential, such as boat building, marine flotation, and buoy construction. The foam's lightweight nature and closed-cell structure provide excellent buoyancy properties.
  5. Thermal and Acoustic Insulation: Mix and pour foam can also offer thermal and acoustic insulation properties. The cellular structure of the foam provides insulation against heat transfer and sound transmission, making it suitable for applications where temperature control or noise reduction is required.
  6. Compatibility: It is important to ensure that the mix and pour foam is compatible with the specific composite materials and the intended application. Consider factors such as adhesion to the substrate, compatibility with other chemicals or resins used in the composite, and any special considerations based on the environment in which the foam will be used.
  7. Application and Molding: Mix and pour foam can be poured or injected into molds or cavities to create the desired shape or form. The foam expands to fill the available space, creating a uniform cellular structure. Care should be taken to follow the instructions regarding mixing ratios, pot life, and curing times for optimal results.
  8. Post-Processing: Once the mix and pour foam has cured, it can be further shaped, cut, or finished as required for the specific application. Additional surface treatments, coatings, or adhesives can be applied to enhance the foam's performance or appearance.

When working with mix and pour foam, it is important to follow the guidelines and instructions for proper mixing, handling, and safety precautions. It is also advisable to conduct small-scale tests or prototypes to ensure compatibility and desired performance before applying the foam to larger-scale composite projects.

You can place an order right here on our website or, if you have any questions, call 1.800.838.8984 | 8 a.m. - 5 p.m. EST Mon-Fri.

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