Pella Impervia Fiberglass vs. Marvin Fiberglass
A side-by-side comparison of these two frame materials.
Pella’s Manufacturing Process Delivers Strength
Your home deserves the best fiberglass window and door material. To prove Pella’s superior strength, they tested their exclusive fiberglass—engineered with a one-of-a-kind manufacturing process—against Marvin’s randomly blown fiberglass. The results speak for themselves!
Won't Bend
Pella fiberglass is on average
1.8x
Stronger than Marvin fiberglass in a bend test.
Won't Dent
Pella fiberglass is on average
2x
More impact resistant than Marvin Fiberglass.
Won't Break
Pella fiberglass is on average
1.8x
The tensile strength of Marvin fiberglass.
Pella Fiberglass vs. Marvin Fiberglass: 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. Marvin Fiberglass: 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.
The Strongest Fiberglass vs. Standard Fiberglass
Take a look beneath the surface to see what sets Pella’s proprietary fiberglass apart from Marvin’s standard fiberglass. Discover how Pella’s engineered structural mat delivers superior strength and durability.
Pella Impervia – Engineered for Superior Strength
Pella’s proprietary fiberglass starts with a carefully designed structural mat, featuring strategically woven rovings for maximum durability. These rovings are pultruded—pulled through a machine, injected with polymer resin, and heated—creating a thermoset material that won’t break down over time. Rigorously tested, Pella’s fiberglass is the strongest material available for windows and patio doors, ensuring unmatched performance.
Marvin Ultrex – A Basic Fiberglass Material
Marvin’s Essential Collection windows and doors use randomly blown fiberglass rovings, fused together with resin to form the frame. Without the structured reinforcement found in Pella’s proprietary process, this basic fiberglass lacks the exceptional strength and durability of Pella Impervia.
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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