The pultrusion process utilized in the manufacturing of pultruded fiberglass grating and structural shapes is a continuous and automated process where continuous fiberglass rovings and mat are pulled through guides, a resin bath and pre-formers, then wrapped with a synthetic veil before being pulled through a heated die. The individual components of pultruded fiberglass grating – load bars and each piece of the two piece tie-bar are pultruded separately.
Load bars are then cut to specified lengths as they exit the machine. They are drilled at 6” or 12” centers for tie-bar insertion. Once the bars have been drilled they are spaced proportionately for the width of the panel at 3 ft, 4 ft or 5 ft. The two piece locking tie bar assemblies are then inserted creating multiple bonded intersections of load bars and tie bars, thus providing the security of both a mechanically locked and bonded connection. The final step in the process is to seal the cross bars and holes with corrosion resistant epoxy resin.
Pultruded fiberglass grating is uni-directional in strength and provides increased load capacity and very good levels of corrosion resistance. The components (bearing bars and cross bars) which are pulled by machine, provide a higher glass to resin ratio content (65% glass to 35% resin) which gives it superior load capacity, yet reduces the corrosion resistance when compared to molded fiberglass grating.
Assembled from components, pultruded fiberglass grating can offer a wide variety of panel sizes and substantially reduce "scrap loss" not always possible from molded fiberglass grating panels. In addition, since the pultrusion process is automated, it produces a consistent, high quality finished product.
Advantages of Pultruded Fiberglass Grating
- High Strength
- Exceptionally High Strength to Weight Ratio
- Lighter Weight
- Accomodates Higher Loads at Greater Spans