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
    7.8x

    stronger than Fibrex in a bend test.33

    Won't Dent
    Pella fiberglass is on average
    73x

    more impact resistant than Fibrex.27

    Won't Break
    Pella fiberglass is on average
    19x

    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.

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    pella rep helping a window customer
    Testing our Fiberglass to the Extremes

    01:34

    Pella Fiberglass vs. A Bowling Ball
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    A child plays with toys by a large black fiberglass window in a bright, modern room.
    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.

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