What is Ultrex?

Why Choose Marvin Windows New Jersey for Ultrex Fiberglass

With exclusive rights to sell Marvin windows in Northern New Jersey, we are dedicated to bringing unmatched commitment to quality and customer satisfaction right into your home. When it comes to choosing the right materials, Ultrex Fiberglass is the ultimate solution that outperforms all competitors in the following four critical areas:


  • Strength — Ultrex fiberglass is neither big nor bulky. Beautiful in appearance and pleasing to the eye, it has an additional 4 inches of viewing space without assuming a massive dimension.
  • Low Expansion – Does not suffer from the same level of expansion and contraction as other window materials do; it will not easily succumb to seal failure, glass fogging, or air infiltration.
  • Low Maintenance – Requiring almost zero maintenance on your part, the acrylic coated fiberglass will not require any finishing touches or repainting. It is easy to clean and will make window maintenance an effortless chore for any homeowner.
  • Durability – With a insulation level close to wood and PVC (materials that are typically good insulators), it is 500x less conductive than aluminum. They demonstrate superior thermal performance and are made to last a lifetime.

Whether it is aluminum, vinyl, or any composite window materials, Ultrex fiberglass is the perfect material thanks to their unmatched beauty and longevity.

Marvin Fiberglass is Stronger, more durable and safer

Fiberglass vs Vinyl

Besides expanding and contracting 883% less than vinyl, Ultrex fiberglass can also resist UV degradation up to 5 times longer than most vinyl products. There is no worry about seeing your beautiful windows suffering brittle, cracks, or discoloration. In fact, Ultrex Fiberglass materials are found on all Infinity windows from Marvin, and will give you a 38% longer service lifetime than the common vinyl replacement products you find on the market today.

Fiberglass Energy Efficient

Ultrex Performance

This eco-friendly material demonstrates exceptional energy efficiency. Along with its superior thermal performance, as well as a low thermal expansion, it also meets and exceeds EnergyStar guidelines. Impervious to the most unforgiving weather conditions, Ultrex requires 39% less energy to produce than vinyl; 80% for aluminum. The advantages become even more compelling when you realize it can block up to 95% of UV radiation without compromising natural lighting and indoor visibility.

Fiberglass is extremely strong

Ultrex Strength

Known to be 8 times stronger than vinyl and 3.5 times stronger than any wood and vinyl composites, the acrylic finish on Ultrex fiberglass offers a sleek and lasting appeal. Widely coveted for their convenient operation and easy upkeep, this tough material is said to be as strong as low carbon steel — so strong that penetration will be impossible without a diamond-edge blade!

Fiberglass is customizable and looks great

Ultrex Appearance

Combining aesthetics and functionality, you’ll be thrilled to learn that Ultrex allows for not only generous color selection, but also beautiful emulation of various textures and styles. Flexible in customization and design, the narrow sash and frame dimensions will give you a traditional and elegant charm unfounded in any other window on the market.

No matter what kind of style or appeal you want to create, our staff at Marvin Windows NJ promises to deliver the best material with the absolute best installation! Request a Quote using our easy online form or call 877-387-3093.