How Strong is Ultrex?

How Strong Is Ultrex Fiberglass?

That's a tough question to answer but it doesn't stop us from trying!  Infinity replacement windows and doors are built from Ultrex fiberglass, a tough, rigid material that delivers outstanding finish and performance. They'll never leave you and your construction, remodeling or replacement project hanging. You won't find a stronger window on the market. Not only is it 8x more rigid than vinyl, just one inch of Ultrex can hold up to 34,000 pounds!

Our Windows Are 8X Stronger Than Vinyl

Infinity from Marvin fiberglass windows are 800% stronger than vinyl and 300% stronger than composite windows. Don’t make the blunder of selecting vinyl windows that will eventually have to be replaced. Experience the beauty, coziness, and security of Infinity Windows for as long as you own your home. Do it right the first time and choose Infinity from Marvin – Built for Life!