American Architectural Manufacturers Association

WHAT IS PULTRUSION?

Pultrusion process propels fiberglass technology
Fiberglass is often created through a process called pultrusion, where glass strands are pulled through resin and then shaped through a die or a mold to create a finished lineal.

Pultrusion is a fabrication process that produces lineal material used to create fiberglass windows and doors. Fiberglass pultrusions were invented in the late 1940s and 1950s. Today fiberglass windows and doors are found in homes and businesses throughout North America and around the world. Learn more about the pultrusion process in the Fiberglass Material Council’s continuing education course, Fiberglass for Fenestration. (Image below from education course.)