Window Fiberglass Showcases Strength in ASTM Tensile and Bend Tests

Your reputation is your strongest asset. Pella goes to extreme lengths to deliver business support and products you can stand behind—like Pella Impervia Fiberglass, the strongest fiberglass available for windows and patio doors. 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.

Pella’s fiberglass material allows you to achieve commercial-grade strength and lasting durability for your customers’ long-term return on investment. A cost-effective alternative to aluminum, our fiberglass products are engineered for the rigorous performance requirements of commercial buildings, including resistance to water, wind and outside noise. Balance thermal efficiency, scale and value when it matters most.

On average, Pella Impervia Fiberglass was 1.8-times stronger than conventional fiberglass (tensile testing performance based on testing 7 samples of each material using ASTM D638 test methodology), had 2-times the tensile strength of aluminum and was 2-times stronger than aluminum in a bend test (3-point bend testing performance based on testing 7 samples of each material using ASTM D790 test methodology).

With our dedicated team of engineers, architects, drafters and installation experts, we’re ready to collaborate with you, from initial concept to punch list.