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Ultrex is 8X more rigid than vinyl and is built to last.

Patented performance.

The strength of Ultrex starts with our patented fiberglass pultrusion process.

What starts as strands of glass finishes as the strongest window material on the market. Ultrex is lightweight and as strong as steel.
Ultrex is much stiffer than vinyl and wood/vinyl composites.

Strong as steel.

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!