Fiberglass woven roving is a heavy-duty bidirectional reinforcement fabric made by interweaving continuous glass fiber bundles (called rovings) on industrial looms. Unlike woven fiberglass cloth — which uses fine twisted yarns — woven roving uses untwisted, flat roving bundles, resulting in a coarser, thicker fabric with a significantly higher fiber volume per layer.

The result is a material that delivers:

• High tensile and flexural strength in both the 0° (warp) and 90° (weft) directions

• Fast and uniform resin wet-out thanks to its open weave structure

• Excellent thickness build-up per layer — a single layer of 800 g/m² woven roving can replace several layers of thinner cloth

• Broad compatibility with polyester, vinyl ester, epoxy, and phenolic resin systems

Fiberglass woven roving has been a cornerstone material in composites manufacturing since the 1950s and remains the go-to reinforcement for large structural parts where mechanical performance and cost efficiency both matter.