FAQ Knowledge Articles

Coefficient of thermal expansion (CTE) relates to how much an object changes in various temperatures. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure. These may be volumetric, area or linear coefficients.  Some may more easily understand this as expand and contract (expansion and contraction).

This is especially important in the window and door industry.  Vinyl, though popular, has a high CTE, making it a less desirable product material because its size can change with the weather.  Ultrex (specially formulated, propietary pultruded fiberglass) with it's low CTE is much more desirable as a product material component because it is far less susceptible to environmental conditions.  
User-added image
Marvin Windows and Doors is pleased to offer numerous attractive products that utilize the low CTE Ultrex material.

For more information, see:
Why should you choose windows and doors made with Ultrex fiberglass?
What are some of the benefits of Ultrex?
How is the fiberglass used in your Integrity and Infinity products?