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Published on Dec 14, 2011
Ultrex, a pultruded fiberglass used in Integrity from Marvin windows and doors, may just be the perfect building material. As strong as steel, Integrity is so tough that we cut it with diamond-tipped blades. Perfect for windows and doors, Ultrex expands at the same rate as glass. Finally, the finish is three times as thick as the competition's and is AAMA verified. No blistering. No corrosion. No peeling.