Biaxial fiberglass is a type of fiberglass fabric where the fibers are stitched together in two directions—typically at +45° and -45° angles or 0° and 90°. Unlike woven fiberglass, the fibers in biaxial cloth are not interlaced, but rather laid flat and stitched, which improves strength and drapability.

Unlike woven cloth, biaxial fiberglass is stitched, not woven, so it lays flatter, wets out faster, and provides superior load distribution without crimped fibers.

Biaxial fabric works well with polyester, vinyl ester, and epoxy resins. Be sure to choose the right resin system for your project and material compatibility.

The number refers to the weight: 1708 is 17 oz stitched fabric with an 8 oz chopped strand mat backing. 1808 is similar but with 18 oz stitched fabric. The mat backing improves bond strength with polyester resin.

It’s used in marine repairs, boat hulls, surfboards, structural panels, and any application where multi-directional strength is needed.