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Our Fiberglass is Stronger than the Competition.61

Pella® Impervia® Fiberglass
Won't Bend or Break

as much as the competition in a bend test and tensile strength test.

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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Pella’s proprietary fiberglass material has displayed superior strength over wood, vinyl, aluminum, wood/plastic composites, and other fiberglass materials used by leading national brands in tensile and 3-point bend tests performed in accordance with ASTM D638 and D790 testing standards.

Find the Right Product For Your Project

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

pella rep helping a window customer

Fiberglass is STRONG. We Made it the STRONGEST Material for Windows.

We routinely test beyond requirements to ensure quality windows and doors that are built to last a lifetime of everyday use. But we wanted to show exactly how strong our fiberglass is to help you find the best fiberglass windows and patio doors for your project. With relentless strength and long-lasting durability, Pella's proprietary fiberglass helps ensure less maintenance with fewer callbacks.

a pickup truck hanging on two impervia sills being upheld by forktrucks
Watch the Video

01:15

Pella Fiberglass Lifts a Heavy-Duty Truck

We used bolts, shackles and adapters to attach four Pella fiberglass window lineals to the tow hooks and hitch of a 6,600-pound heavy-duty pick-up truck. We then attached the top of each lineal to a forklift and suspended the ¾-ton truck into the air.

What is tensile strength?

Tensile strength measures a material's ability to withstand being pulled apart or stretched. The strongest material helps ensure your window or patio door resists wear and tear, and the demands of everyday life for long-lasting, long-term performance.

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01:03

Pella Fiberglass Resists 1,000 lbs. of Concrete Blocks

To test the strength of our exclusive fiberglass material, we constructed a metal stand and steel platform that would hold a suspended load of concrete blocks weighing 1,000 pounds from a single Pella fiberglass sliding patio door jamb lineal.

What is a 3-point bend test?

3-point bend measures the flexural strength of a material by supporting a lineal at two end points and applying force via a single, concentrated load point in the middle. Products made of the strongest material will not warp or bow in the summer heat. This means your window or patio door maintains tight seals and optimal operation year after year.

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01:34

Pella Fiberglass Withstands Dents from a Bowling Ball

To demonstrate how well our proprietary fiberglass material holds up to impact, we created a test where we dropped a 10-pound bowling ball onto a section of a Pella fiberglass sliding patio door jamb lineal from seven feet in the air. Watch the video to see it in action.

What is impact testing?

Testing for impact resistance measures a material's ability to withstand a sudden, high force. Whether it is a slipping hammer on the jobsite, damage from your pets or tough kids, a stronger material can handle whatever life throws at you.

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.

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LIMITED LIFETIME WARRANTY

Pella products are backed by some of the strongest warranties in the business.

Learn more about Pella warranties