Building a better window with Ultrex pultruded fiberglass.
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The History of Ultrex®

For nearly a century, Marvin Windows and Doors has cultivated a worldwide reputation as an industry leader in product innovation, energy efficiency and progressive manufacturing techniques. Bringing you superior windows and doors through exceptional design, the highest quality materials and an extraordinary level of service.

With almost two decades of experience in the development and manufacturing of Ultrex, Marvin has established itself as the industry leader in fiberglass pultrusion. The superior performance of Ultrex is the result of patented processes that provide exceptional durability and stability, with attractive, detailed product designs not found in alternative composite materials including other pultruded fiberglass.

Today, Ultrex is available in a wide range of beautiful, long-lasting windows, doors and siding.

Ultrex Timeline

Marvin pioneered Ultrex pultruded fiberglass, offering the design detail, strength and durability required for long-lasting, beautiful windows, doors and siding.

Marvin Windows and Doors: marvin.com

1992

Marvin introduces Ultrex sills on Sliding French Doors, Replacing inefficient aluminum sills found on most doors.

2000

Marvin introduces Ultrex sills on Inswing and Outswing French Patio Doors.

Integrity Windows and Doors: integritywindows.com

1994

Marvin introduces Integrity Windows, a new product line made exclusively with Ultrex pultruded fiberglass.

1995

Integrity Windows and Doors begins manufacturing in Fargo, North Dakota.

1996

Integrity opens a second manufacturing plant in Fargo, North Dakota and launches its new Wood-Ultrex series.

1997

Integrity introduces Sliding Patio Doors. Its first patio door made of Ultrex pultruded fiberglass.

1999

Integrity introduces Inswing French Doors. The first hinged patio door with frames, door panels and sills made of Ultrex pultruded fiberglass.

2004

Integrity opens an Ultrex pultruded fiberglass manufacturing facility in Roanoke, Virginia.

2006

Integrity introduces its All Ultrex series of windows and doors.

2008

Integrity introduces IMPACT windows featuring an extra-strong Ultrex fiberglass exterior that is built to withstand hurricane-force wind.

Infinity Windows and Doors: infinitywindows.com

2002

Marvin introduces Infinity Replacement Windows, releasing its first product, the insert double hung.

2007

Infinity Replacement Windows opens a new manufacturing facility in West Fargo, North Dakota.

Apex Ultrex Siding System: apexsiding.com

2006

The launch of APEX Siding System, the most revolutionary home exterior on the planet. APEX is the first siding and trim system made of the ultimate building material, Ultrex pultruded fiberglass.

Entrust Door Frames: EntrustDoorFrames.com

2006

Entrust door frames made of Ultrex are introduced to the market. Entrust is the quality choice for high performance, precision fit and finish entrance door frames.