Fiberglass mesh with a weight of 80 gsm (grams per square meter) typically contains fiberglass strands woven together to form a mesh fabric. The increase in weight from 45 gsm to 80 gsm suggests a denser and potentially stronger mesh.
Like other fiberglass meshes, the primary content of this material is fiberglass. Fiberglass is composed of fine fibers of glass, usually made from molten glass that is drawn into thin strands. These strands are then woven or laid into a mesh pattern.
In addition to the fiberglass fibers, the mesh may also include coatings or treatments to enhance its properties such as water resistance, durability, or fire resistance. The exact composition and specifications can vary depending on the manufacturer and intended application of the fiberglass mesh.