Design Options | Fiberglass
Fiberglass is a composite material. Composites are made by combining two or more materials with different properties to create something superior to the materials on their own.
Knowing the differences between vinyl and fiberglass windows and doors can help you decide which material is best for your home.
November 14, 2022
Vinyl windows made from vinyl (usually PVC) are less costly, low-maintenance, and if the frames are not hollow, they are decent insulators. Because dark exteriors can soften or sag from heat or direct sunlight, most vinyl windows are white or buff, so the color selection is limited. They can also become brittle in very cold temperatures.
Most plastic, vinyl, and vinyl-based composites are made using thermoplastic materials. Thermoplastic materials are polymers that can be softened through heating before being processed and then left to cool and harden. Once cooled, they show no changes in chemical properties, meaning they can be re-melted and re-used several times. When exposed to the sun, thermoplastic materials begin to soften. That means products made from these materials (like windows and doors) start to not fit their openings in hot climates, making them difficult to open and close. It can also cause seals to become compromised.
Marvin pultruded fiberglass is a thermoset material created through a chemical process. It is fundamentally more than the sum of its parts by the end of the manufacturing process. A thermoset fiberglass composite won’t soften or melt when exposed to environmental temperatures. As a result, it is more resistant to pressure and temperature than vinyl-based composites.