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Ultrex is a thermoset material which means it will not get soft and flexible in heat or hard and brittle in cold like thermoplastic vinyl based materials.

ULTREX: Quite possibly the perfect building material

Integrity windows and doors are Built to Perform® with Ultrex® , our highly durable, state-of-the-art pultruded fiberglass with a patented finish that outlasts and outperforms vinyl, roll-form aluminum, and vinyl/wood composites. We use Ultrex to manufacture windows and doors that endure the elements without showing age or wear. That’s toughness

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Ultrex pultruded fiberglass exteriors are paired with either rich wood or Ultrex fiberglass interiors for a long-lasting, virtually maintenance-free replacement window solution. Every Integrity window is precision built to your specifications and can be customized to suit your home’s design with multiple exterior color choices, hardware styles and finishes, and divided lite patterns.


Ultrex is the first fiberglass finish to be verified to any of AAMA’s 624-10 voluntary finish specifications for fiber-reinforced thermoset profiles (fiberglass). The Ultrex patented acrylic cap finish is verified AAMA 623-10 and 624-10 and has passed the AAMA 625-10 lab-based performance test protocols; 625-10 outdoor weathering test protocols are in process. With the industry’s best fiberglass finish, Ultrex resists fading, chalking, scratching, and cracking to keep your project looking good for years to come