8x Stronger Than Vinyl


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3x Stronger than Fibrex


Ultrex – The superior window material

Ultrex – The superior window material

Marvin Ultrex® Fiberglass Windows Infinity® Replacement windows and doors are constructed with Ultrex Fiberglass. This pultruded fiberglass is superior to other window materials due to its unmatched strength and durability. Ultrex fiberglass makes infinity windows...