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three windows for testing andersen fibrex pella impervia fiberglass

    Pella Fiberglass vs. Andersen Fibrex

    It's a One-Sided Fight – Spoiler Alert: Pella Wins

    See how our exclusive fiberglass material outperforms Andersen Fibrex plastic/wood composite to hold up better for the strength and durability your home or project demands.

    Won't Bend
    Pella fiberglass is on average
    10x

    stronger than Fibrex in a bend test.33

    Won't Dent
    Pella fiberglass is on average
    100x

    more impact resistant than Fibrex.27

    Won't Break
    Pella fiberglass is on average
    20x

    the tensile strength of Fibrex.34

    Compare the Superior Strength of Pella Fiberglass vs. Andersen Fibrex

    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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    3-point bend testing performance based on testing 10 samples of each material using ASTM D790 test methodology.

    Pella® Impervia® – 100% Fiberglass. 0% Wood Fiber.

    Take a look behind the paint and see what materials make up Pella's proprietary fiberglass and Andersen Fibrex.

    a close view of pella's fiberglass material

      Pella Impervia, made of our proprietary fiberglass

      Our fiberglass starts with our structural mat which places rovings in a specific, intricate order to meet Pella’s high strength standards. The mat and additional rovings are pulled through a machine, injected with polymer resin and heated to create an entirely new, thermoset material. Our fiberglass material is the strongest available for windows and patio doors.9

      andersen's fibrex material failed the hammer test

        Andersen Fibrex, made of plastic, wood fiber and glue

        Contrary to popular belief, Andersen Fibrex is not fiberglass, but is instead made of 40% wood fibers and 60% plastic that is fused together with glue to create the window or door frame. Without strong fiberglass rovings and mats, this thermoplastic material used on Andersen 100 Series and Renewal by Andersen Fibrex products is susceptible to breaking and shattering.

        Find the Right Product For Your Project

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

        I'm a ProI'm a Homeowner
        pella rep helping a window customer

          See how we simulated a slipping hammer on a jobsite to see the damage.

          01:43

          Testing our Fiberglass to the Extremes

          01:34

          Pella Fiberglass vs. A Bowling Ball

          To demonstrate how well our proprietary fiberglass material holds up to impact, we decided to take things to extremes and go far beyond our normal testing practices. We created a test where we dropped a 10-pound bowling ball onto a section of our fiberglass sliding patio door jamb lineal (the frame of your door) — from seven feet in the air.

          More Extreme Tests
          testing material by dropping a volleyball onto a piece of fiberglass material
          Pella Fiberglass vs. A Bowling Ball
          Now Playing
          testing material hanging cinder blocks off a piece of fiberglass frame
          Behind the Bend Test
          testing material by hanging a pickup truck from a window frame
          Strong enough to lift a heavy-duty truck
          See How Our Fiberglass is the Best Fiberglass for Your Project
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          Strategic Woven Fibers vs. Basic Random Fibers

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          Strategic Woven Fibers vs. Basic Random Fibers

          Pella vs. Jeld-Wen

          Strong Fiberglass vs. Bendable Vinyl

          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

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

            I'm a ProI'm a Homeowner