5 Benefits of Ultrex Fiberglass



Introducing Infinity Ultrex fiberglass from Marvin, the premium fiberglass material that outlasts all other materials in the window replacement industry. It's resistant to rot, warping, and dents and has superior UV degradation protection.




5 Benefits of Ultrex Fiberglass

fiberglass vs vinyl windows

Infinity Fiberglass Frames

Infinity window frames are made with Marvin's Infinity Ultrex, which is incredibly strong. This allows us to use less material, resulting in more natural light and an unobstructed view entering your home.

Superior window material

Ultrex fiberglass is a superior window material that outperforms vinyl, roll-form aluminum, and other window materials. It is as strong as steel, eight times stronger than vinyl, and 3.5 times stronger than wood/vinyl composites. Ultrex has a very low rate of temperature transfer, and its tendency to expand and contract is seven times less than vinyl, which helps keep the window stable and weatherproof.

Resists window leaks

Our Infinity fiberglass windows are designed to expand at the same rate as glass, ensuring a tight and true fit that resists leaks, seal failures, and stress cracks. This helps maintain energy efficiency and long-term performance.

Fade Resistant Finish

Want long-term color retention? Ultrex uses an acrylic finish that is fade-resistant and virtually maintenance-free.  With a finish that's 3 times thicker than other windows,  Ultrex resists chipping, denting or peeling.

Everwood beauty and texture

Infinity windows are designed to have an appealing and detailed appearance similar to high-quality wooden windows while offering the practical advantages of fiberglass. Our innovative EverWood® interior finish features a realistic wood grain texture, providing a natural look and feel. This finish also boasts impressive durability, making it an ideal choice for those seeking low-maintenance windows that can be painted and stained just like real wood.

Which type of boat do you consider more reliable: one made of plastic or one made of fiberglass?


Find out how Infinity Windows can benefit you

These are just a few advantages of Ultrex Fiberglass and Marvin Infinity Windows.  Please feel free to contact us for further information via phone or email..





Gravinas Window Center of Littleton
Phone: 303-794-0490
209 W. Littleton Blvd.
Littleton, CO 80120
Infinity Replacement Windows from Gravina’s Window Center of Littleton®