Ultrex Pultruded Fiberglass
Highly durable. Extremely reliable. Built with Integrity®.
This premium composite material has been leaned on for over 20 years.
Strong as steel.
Ultrex pultruded fiberglass was designed by Marvin® Windows and Doors to meet serious performance needs without sacrificing style. Despite being introduced over 20 years ago, its innovative toughness continues to impress today.
Just one square inch of Ultrex material can support up to 34,000 lbs. That’s 8 times stronger than vinyl, or the weight of two monster trucks. This strength is engineered into every Integrity product.
Unlike vinyl windows, Ultrex products are available in dark finishes like Bronze and Ebony. Their acrylic finish is three times thicker than competitors’, providing long-term color retention while protecting against cracks, dents, chips and peels.