Moulded vs. Pultruded FRP: Things to Consider When Choosing Between the Two

For many years, fibre-reinforced plastics have significantly increased in popularity as sustainable construction has become the norm. The remarkable attributes of FRP materials have transcended traditional limitations, introducing a new era of possibilities in structural design, longevity, and performance.

There are two types of FRP gratings: moulded and pultruded. Each process results in products with unique properties tailored towards specific applications. But picking which you might need between the two can be confusing, so considering some things before buying can be a game changer. This will allow you to purchase an FRP grating type that will provide optimal functionality for the desired application. 

Strength and Rigidity

Moulded FRP gratings are known for their corrosion resistance and moderate strength. They are suitable for applications where moderate loads and aesthetic considerations are essential. Meanwhile, pultruded FRP gratings excel in strength and load-bearing capabilities. Their continuous fibre arrangement and high resin content result in a gratings structure that can withstand heavy loads and stress.

Production Costs and Sizing

Another consideration is production costs and part sizing. Generally, pultruded parts are less expensive when produced in high volumes with standard profiles. This makes pultruded FRP economical for mass-produced items like structural beams and channels. In contrast, moulded FRP is better suited for lower-volume production and custom shapes. Moulding allows for more unique contours and forms not achievable with pultrusion.

Electrical and Thermal Properties

In some applications, properties like electrical and thermal conductivity are critical. Pultruded FRP typically provides lower electrical conductivity thanks to its high fibre reinforcement. This prevents static charge buildup and minimises interference with signals. Pultruded FRP gratings can also be engineered to be fire-retardant by incorporating additives during manufacturing.

Moulded FRP with lower fibre content has slightly higher electrical conductivity, making it less ideal around sensitive signals and electronics. Its thermal property depends on the resin type used in manufacturing. Some resin options offer moderate fire resistance, making them suitable for applications where fire safety is not a primary concern.

Lead Time

Differences in production speed and lead times may steer selection between moulded or pultruded products. Lead times can vary significantly depending on the design’s intricacy and manufacturing method. Pultrusion machinery runs continuously, making pultruded parts faster overall and less labour-intensive. Meanwhile, moulded components often require design, machining, and approvals, increasing costs and production lead time.

Where to Buy FRP Gratings?

Are you looking for a trusted FRP supplier in Australia? Then Sustainable Infrastructure Systems is for you. Our team specialises in the development of sustainable products by using a holistic project management approach to guarantee the best results. Connect with us by emailing or by calling 1300 261 074.