Pella Impervia Fiberglass vs. Andersen Fibrex
A side-by-side comparison of these two frame materials.
Pella Impervia vs. Andersen Fibrex: A Clear Winner in Strength & Durability
When it comes to long-term performance, not all materials are created equal. See how Pella’s exclusive fiberglass outperforms Andersen’s Fibrex composite with superior strength, durability, and resistance to extreme weather—giving your home or project the lasting quality it deserves.
Won't Bend
Pella fiberglass is on average
10x
Stronger than Fibrex in a bend test.
Won't Dent
Pella fiberglass is on average
100x
More impact-resistant than Fibrex.
Won't Break
Pella fiberglass is on average
20x
The tensile strength of Fibrex.
Pella Fiberglass vs. Andersen Fibrex: Which Is Stronger?
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.
3-point bend testing performance based on testing 10 samples of each material using ASTM D790 test methodology.
As much as the competition in a tensile strength test, which measures the stress a material can withstand while being stretched before breaking.
Tensile testing performance based on testing 5 samples of each material using AST D638 test methodology.
As much as the competition in an impact resistance test measuring a materials ability to withstand a sudden, high force.
Impact testing performance based on testing 10 samples of each material using ASTM D256, Method C.
Pella Fiberglass vs. Andersen Fibrex: Which Is Stronger?
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.
3-point bend testing performance based on testing 10 samples of each material using ASTM D790 test methodology.
As much as the competition in a tensile strength test, which measures the stress a material can withstand while being stretched before breaking.
Tensile testing performance based on testing 5 samples of each material using AST D638 test methodology.
As much as the competition in an impact resistance test measuring a materials ability to withstand a sudden, high force.
Impact testing performance based on testing 10 samples of each material using ASTM D256, Method C.
Pella® Impervia® – 100% Fiberglass, 0% Wood Fiber
Discover what sets Pella’s proprietary fiberglass apart from Andersen Fibrex. See beyond the surface to explore the materials that contribute to strength, durability, and long-term performance.
Pella Impervia: Engineered with Proprietary Fiberglass for Superior Strength
Pella’s proprietary fiberglass starts with a structural mat that strategically layers rovings in an intricate pattern to meet rigorous strength standards. This mat, along with additional rovings, is infused with polymer resin and heat-cured, creating an ultra-durable thermoset material. As a result, Pella’s fiberglass is the strongest available for windows and patio doors, offering unmatched performance and longevity.
Andersen Fibrex: A Blend of Plastic, Wood Fiber, and Adhesives
Despite common misconceptions, Andersen Fibrex is not fiberglass. Instead, it consists of 40% wood fibers and 60% plastic, bonded together with adhesives to form the window or door frame. Lacking the structural strength of fiberglass rovings and mats, this thermoplastic material—used in Andersen 100 Series and Renewal by Andersen products—is more prone to breakage and degradation over time.
Pella Takes Fiberglass Testing to the Extreme!
Pella Fiberglass vs. A Bowling Ball
Lifting a heavy-duty truck with fiberglass window lineals isn’t an everyday test—but Pella put their proprietary fiberglass to the ultimate challenge. Using four Pella fiberglass window lineals, securely bolted to the tow hooks and hitch of a 6,600-pound pickup truck, they proved just how strong and durable their material really is. Watch as a ¾-ton truck is lifted into the air, showcasing why Pella’s fiberglass is engineered to handle extreme pressure and real-world demands.
Strong Enough to Lift a 6,600-Pound Truck
Pella took impact testing to the next level to prove the strength of their proprietary fiberglass. In this extreme test, a 10-pound bowling ball was dropped from seven feet onto a section of a Pella fiberglass sliding patio door jamb. The result? A material built to withstand real-world impact far beyond standard testing. Click Play to see how it holds up.
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