Moulded Fibreglass Grating

Also known as GRP Grating, FRP Grating & Composite Grating

Moulded Grating vs Pultruded Grating

Moulded Grating

Liquid resin and continuous fibreglass roving are systematically laid in the mold, layer after layer manually, to produce the desired thickness and panel dimensions. The finished molds are set aside for a predetermined time to allow the panel to cure. The panel is then ejected from the mold. The molds are cleaned and prepared for the process to begin again. 

Moulded Fibreglass Grating

The one piece interwoven square mesh construction of moulded grating produces two primary benefits: maximum corrosion resistance and high strength. 

Because the grating is "cast" in one piece, there is no mechanical joint between bearing bars, unlike the pultruded grating where the glued joints can give way in heavy continuous traffic or after prolonged service. 

The high percentage of resin (65%) in moulded grating offers superior corrosion resistance. The moulded grating with a square mesh pattern offers increased load capacity and panel utilization due to this bi-directional trait. 

Cutting access holes in the moulded grating does not weaken the panel and does not require additional or costly supports (unlike pultruded grating that must be re-supported and edge-banded).

Pultruded Grating

The pultruded grating product is a mostly mechanized process. Fibreglass of different shapes such as: strand, mat and veil are pulled through a liquid resin bath and a heated die where the bar is shaped and the resin is cured. These pultruded bars can be cut into various lengths. The bars are then drilled on the sides to accept the crossbars. The drilled bars are spaced proportionally for the width of the panel as desired. The final step is to seal the entire cross bars and holes with corrosion resistant epoxy resin. 

Moulded Fibreglass Grating

The pultruded grating provides increased load capacity with moderate levels of corrosion resistance. The components (bearing bars and cross bars) are pulled by machine to have a higher glass content. Its superior load capacity to moulded grating is a result of the higher glass to resin ratio (65% glass to 35% resin). However, the lower resin content reduces the corrosion resistance as compared to the moulded grating. 

The pultrusion process is automated and produces a consistent, high quality finished product. 

Assembled from bars, the pultruded grating can offer a wide variety of panel sizes and substantially reduce "scrap loss" not always possible from moulded grating panels.