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cross section of pella fiberglass window material with callouts

    Pella Fiberglass vs. Marvin Fiberglass

    Intentional vs. Random, Which Strength Would You Prefer?

    Your project deserve the best fiberglass window and door material. To see how we stack up against the competition, we put our exclusive fiberglass, developed using our one-of-a-kind manufacturing process for superior strength, and Marvin, basic randomly blown fiberglass, to the test.

    Won't Bend
    On average, Pella fiberglass is
    1.8x

    stronger than Marvin fiberglass in a bend test.36

    Won't Dent
    On average, Pella fiberglass is
    2x

    more impact resistant than Marvin Fiberglass.35

    Won't Break
    On average, Pella fiberglass has
    1.8x

    the tensile strength of Marvin fiberglass.37

    Pella Outperforms Marvin with Unmatched Strength and Lasting Durability

    Pella's proprietary fiberglass material is the strongest material for windows and patio doors, engineered for lasting durability.9

    As much as the competition in a bend test, which measures the flexural strength of a material by applying force via a single, concentrated load point in the middle.
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    Tensile testing performance based on testing 7 samples of each material using ASTM D638 test methodology.

    The Strongest Fiberglass vs. Basic Fiberglass

    Take a look behind the paint and see what materials make up Pella’s proprietary fiberglass and Marvin basic fiberglass.

    a close view of pella's fiberglass material

      Pella Impervia, made of our proprietary fiberglass

      To meet Pella’s exceptionally high strength standards, our fiberglass starts with a proprietary structural mat. These strategically woven rovings and additional rovings are pultruded, or pulled through a machine, and heated with a polymer resin to create a thermoset material that won’t break down. Our fiberglass is the strongest material available for windows and patio doors.9

      a close view of traditional fiberglass material

        Marvin Ultrex, a basic fiberglass

        Marvin’s Essential Collection windows and doors use randomly blown fiberglass rovings and heated with resin until the materials become one. The randomness of the fibers means it cannot withstand the incredible strength Pella Impervia fiberglass can.

        Find the Right Product For Your Project

        Work with a dedicated Pella representative every step of the way.

        I'm a Homeowner
        pella rep helping a window customer
          Bringing Our Superior Strength to Life

          01:34

          Withstanding a 10-pound bowling ball drop

          To bring the strength of Pella fiberglass to life, we decided to take it to the extremes by dropping a 10-pound bowling ball from a height of seven feet onto a sliding patio door jamb lineal below. Whether it is a slipping hammer on the jobsite or even a bowling ball, our fiberglass is up to the challenge.

          testing material by dropping a volleyball onto a piece of fiberglass material
          Withstanding a 10-pound bowling ball drop
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          woman with white blouse using the easy slide operator on a casement window
            Get the Best Fiberglass Windows & Patio Doors

            Designed to stand up to everyday wear and tear, Pella Impervia products offer an on-trend color palette, including black, and feature our latest innovation, the Easy Slide Operator window hardware, winner of Best in Show at the 2021 International Builders Show.

            Explore Additional Product Details

            Ready to take the next step?

            Work with a dedicated Pella representative every step of the way.

            I'm a Homeowner