The Manufacturing Process Behind Our Fibrex® Frame Material

Fibrex® is a composite material made from wood fibers and polymer. Patented in 1991, this innovative frame material helps make Renewal by Andersen® replacement windows strong, durable and energy-efficient.

Renewal by Andersen by Portland, your local source of windows and patio doors, takes a look at the manufacturing process behind Fibrex in today’s post.

How Is Fibrex Made?

Fibrex is composed of 40% reclaimed wood fiber by weight and 60% proprietary polymer. The wood used to make the composite material is repurposed—mostly leftovers from wood windows being manufactured by Andersen.

The manufacturing process of our replacement windows starts with the removal of moisture from the wood fibers. The fibers are then combined with the polymers, which are heated at a specific temperature until they become liquid. The fusion starts at a molecular level, where the liquid polymer is pressurized to envelop every cell of the wood fiber.

Individual fibers begin to bond, creating a composite material engineered to be twice as strong and durable as vinyl. Once done, an extruder is used to mold into any shape. Our unique fabrication process allows us to also mix colors that can match your interior and exterior elements.

The Benefits of Fibrex Windows

Fibrex has an astounding ability to repel moisture, thanks to the alignment of the wood fibers with the polymer. Even during torrential downpours, you can expect your windows’ exterior to stand up against mold and rot.

Also, the material can help you achieve a more energy-efficient home. Through our professional installation, your windows can help reduce thermal transfer and keep interior temperatures at acceptable levels. Combined with our high-performance window glass, your new windows can help lower the cost of your monthly energy consumption.

Turn to Renewal by Andersen of Portland for your replacement window and door installation needs. Call us today at to learn more. You may also fill out our contact form for a free in-home consultation. We serve Portland and Wilsonville residents.