Pultruded fiberglass grating is made by the process of pultrusion, which pulls the glass strands through a machine and wraps in a glass fabric, then seals together with a resin. It is manufactured by assembling two structural fiberglass shapes (cross and bearing bars) into a grid pattern, which increases the support and stability of the grating under extreme loads.With its much higher glass content, pultruded fiberglass grating has unidirectional strength, resulting in greater span capability than molded fiberglass grating. This makes it specified for applications that require larger spans or heavier loading.