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Despite the huge variety of resin and glass-fibre choices available; there are predominately two categories of GRP grating:
Core6 moulded grating is manufactured by laying continuous glass fibres reinforcements into a mould, in a vertical and horizontal direction which are then thoroughly wetted out with a thermosetting polyester or vinyl ester resin, layer by layer. During the ‘weaving’ process glass-fibre reinforcements are compressed under weight to ensure the glass is thoroughly compacted and therefore allowing the glass content to be approximately 35% of the products final weight. When the weaving process is completed, the mould is cooled to cure the panel. After curing the panel is inspected, touched-up if necessary and, if a grit top surface is required, put through a horizontal belt-sander to gain a smooth top surface to allow a silica quartz grit to be applied.
Our Core6 GRP Pultruded grating offers a fast, safe and effective flooring solution to high load capacity access areas. Pultruded grating is manufactured by pulling (hence Pul-truded) glass-fibre reinforcement through a thermosetting polyester or vinyl ester resin bath. The thoroughly ‘wetted-out’ fibres are then fed through a pre-formed (and heated) steel die to achieve the shape of the tool.
There are generally two to three components to a pultruded grating, 1) the Load Bearing Bar and 2) the Tie (or Cross) Bars. These are cross-bars are generally from two different shapes to ensure an interlocking mechanism can be achieved.
The Load bearing bars are drilled at approx. every 150mm centres to accommodate the interlocking tie bars. The tie-bars are then fed through the load bars in a jig and bonded together to make the finished panel of grating.
If a gritted top surface is required the cured panel is then sealed with resin on the top and a coating of silica quartz grit is applied, then left to cure before a final secondary resin coat is applied to cover and seal in the grit.
This manufacturing process produces parts that are generally 65% fibreglass and 35% resin (by weight). As a result, this process produces the strongest composite gratings which are often specified in high traffic areas.
How to Choose GRP Grating
|Moulded Grating||Pultruded Grating||Steel Grating|
|Light weight (GRP Density 4 times less than steel)||Y||Y||N|
|Radio Frequencies (FR) and Electromagnetic transparency||Y||Y||N|
|Easy to cut and fabricated||Y||Y||N|
History of GRP
Composites have been used in many industry sectors for over 50 years because of their amazing strength, weight saving benefits, resistance to chemicals and generally their all-round robustness when compared to more traditional metallic products.
GRP/FRP grating was originally developed in the 1960’s to achieve many of the benefits mentioned above. Since their development composite gratings have improved dramatically and they now boast many other added benefits; for example extreme temperature and burn-resistance, low smoke and toxicity benefits, impact resistance; and because of all of these added benefits, there is a product for almost every environment and application.