Profile: National Grating provides molded fiberglass gratings. We are an ISO 9001 and ISO 14001 certified company. We carry a wide variety of standard fiberglass products. Our pultruded fiberglass grating is high-strength grate that performs well in corrosive environments or where a lightweight grating is preferable. The bearing bars of our gratings are interconnected with cross-rods. Fiberglass railing systems provide inherent corrosion resistance.