Infinity Windows from Marvin

Infinity from Marvin® is a line of fiberglass replacement window designed by the experts at Marvin Windows. When you’re making an investment in your home, you want to ensure that it’s built to last. Infinity windows are designed to be tough, high-quality, fiberglass replacement windows that won’t sag, peel or bow over time.The Infinity line was designed for the homeowner who wants low-maintenance, energy efficiency and traditional beauty. Infinity window products are made from patented Ultrex® pultruded fiberglass. Ultrex is much stronger and superior to other materials, and Infinity from Marvin backs their products with a limited lifetime warranty.

Infinity Windows from Marvin

Advantages of Ultrex® Fiberglass

  • Low maintenance
  • Base material is silica sand (an abundant natural resource)
  • Low expansion provides easy operation for the life of the window
  • Strength keeps windows square and true
  • Narrow profiles allow for more visible glass area and expanded views
  • Long-term stability reduces risk of seal failures and air leakage through the window
  • Patented, mechanically bonded inline acrylic finish is up to 3x thicker than competitive finishes, providing superior resistance to discoloring, scratching, and denting
  • Ultrex fiberglass is 8x stronger than vinyl and one square inch can support 41,000 pounds!*
  • Fiberglass windows have a 38% longer useful life expectancy than vinyl.**
  • Infinity windows with Low E glazing can reduce your heating and cooling bills by up to 30%.***

* Stiffness of the material to perform as designed. This stiffness is the flexural modulus of the material and is expressed in pounds per square inch.
** Life cycle assessment of windows for the North American residential market: Case study” by the University of British Columbia. Scandinavian Journal of Forest Research, 2008.
*** Estimated savings are based on data set forth in the Window Selection Tool of the Efficient Windows Collaborative, available at Actual savings will vary by product type, location, method of installation, individual home characteristics, local climates and conditions, utility rates, and other factors.


Download the PDF


Ultrex® Fiberglass Replacement Windows and Doors

Download the Infinity® from Marvin® catalog to learn more about the company’s history, material performance, energy efficiency, features and options, and more.

Download Infinity® from Marvin® catalog | PDF (12MB)

Ultrex strength demonstration


How do I know I’m making the best replacement window decision?

Download the Five Point Proof sheet from Marvin® for a complete walk-through on why Infinity® windows may be your best option.

Download Five Point Proof sheet | PDF (1MB)