How Pella’s Unique Manufacturing Process Delivers a Quality Window

Fiberglass windows offer the best of both worlds: an upscale look with the durability of vinyl, but at a lower price point than wood. Pella’s Impervia windows are able to offer these benefits thanks to an innovative manufacturing process that spares no detail. 

Pella makes and pultrudes the fiberglass windows in house. The windows feature two layers of fiberglass mat around a structural core, a layer of heat-set resin, and a powder-coated exterior finish. 

While typical fiberglass windows are made with a random-fiber mat, Pella has a patented interlocking fiberglass mat, with glass rovings strategically woven for added strength and durability compared to a random-fiber configuration. 

The windows are made in a pultruded process. They are pulled through a die and cut to length, which helps reduce waste. 

Paint doesn’t naturally stick to fiberglass, so the exterior finish undergoes an electro-static baked-on process. The unit is negatively charged and the paint is positively charged, allowing the paint to adhere. 

The other area that sets Impervia apart is its unique corner assembly. The windows have three components work together to ensure a durable, robust corner: a corner lock that holds the lineals together; a strong, durable thermoset polyurethane sealant; and a mechanical fastener for additional holding power.

Learn more about Pella Impervia here.

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