How Strong is Ultrex?

You won’t find a stronger window, doors or siding material than Ultrex pultruded fiberglass. Not only is it 8x more rigid than vinyl, just one inch of Ultrex can hold up to 34,000 pounds!

Infinity Windows and Doors

Infinity replacement windows and doors are built from Ultrex fiberglass – a pultruded fiberglass material so strong and durable it is superior to other window materials. Best of all, it makes Infinity products essentially maintenance free. Our Ultrex finish is as tough as steel, up to 3x thicker than competitive finishes, and is AAMA certified meaning our commercial grade finish resists the harshest weather conditions.

Exclusively at Gravina’s Window Center of Littleton

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