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In our last post, we told you 5 things you need to know about FRP Grating. For those of you that are not familiar with Fibre Reinforced plastic/polymer grating, this article will give you a simplified summary and helpful background on FRP before you dive into reading this post.

For those of you that ARE familiar with FRP, read on and learn more about factors to consider when selecting your grating in addition to how FRP gratings are commonly categorised in the industry.

FACTORS TO CONSIDER WHEN SELECTING YOUR FRP GRATING

Choosing the right grating and correct resin for your application areas depends on two factors:

Environment Factors or Application area

Chemical exposure level

Temperature

Humidity factors

UV exposure

Desired Fire rating

Loading Requirements

Load Rating

Structural Support Span

THE TWO MOST BASIC METHODS OF CATEGORISING FRP

The two most basic methods of categorising FRP (Fibre Reinforced plastic/polymer) gratings are by:

Method of manufacturing/ production

Type of resin (thermosetting) used

There are other sub-categories within this broad classification that are based on application areas. These include:

Type of surface finish

Load rating requirements

Other special requirements such as UV exposure, Fire rating, Colour etc.

1. METHOD OF MANUFACTURING/PRODUCTION

Moulded FRP Gratings

Moulded FRP gratings are manufactured using the following process:

Laying or Weaving glass fibres

This step involves laying continuous glass fibres in the mould in vertical & horizontal directions. These are thoroughly wetted by the chosen resin (layer by layer).

Heating & Curing

After the completion of the weaving process, the mould is heated for curing the panel.

Ejecting the Panel

After the curing process is completed, the panel is ejected from the mould.

Standard panels would have a meniscus (concave) top surface finish. Based on requirements we bond grit to the surface or finish the surface to have a plain finish. These are called secondary operations.

The most important feature of the Moulded FRP grating is that they are an integral, one piece panel offering bidirectional strength. This is a standout feature compared to Pultruded FRP grating.

Pultruded FRP gratings are manufactured using the following process:

Resin Impregnation

Preselected reinforcement materials such as fibreglass roving, mat, woven or stitched fabrics are drawn through a resin bath or resin impregnation zone where the glass substrate is thoroughly impregnated with the resin mixture (liquid thermosetting resin).

Preforming & Forming

This wetted out fibre is formed to a desired geometric shape as it initially gets pulled through the Preformer (Preforming Die) & then through to the Heated Die. Inside the die, the resin curing process is initiated by precisely controlling the temperature. The laminate then solidifies to the exact shape of the cavity in the die (Forming Process), as the pultrusion machine continuously pulls it.

Cutting: An Automatic Cutter is deployed at the end of the machine to cut this Pultruded FRP section to desired lengths.

FRP GRATING

MOULDED FRP MANUFACTURING PROCESS

Liquid resin and continuous fiberglass rovings are sytematically laid in a mould, layer after layer to produce the desired thickness and panel dimensions. The finished moulds are then set aside to cure. The one-piece interwoven mesh construction of moulded fiberglass grating produces a product with optimal corrosion resistance and bi-directional strength. Since the fiberglass grating is "cast" in one piece, there is no mechanical joint between bearing bars. The high percentage of resin (65%) in moulded fiberglass grating offers superior corrosion resistance and optimal impact resistance. Moulded fiberglass gratings with a square mesh pattern offer increased load capacity and panel utilization due to its bi-directional trait. Being of one-piece construction, the fiberglass grating distributes loads throughout the fiberglass grating section.

ADVANTAGES OF FRP MOULDED GRATING

Light weight

Chemical corrosion resistance

Non sparking

Non electrically conductive

Non magnetic

Tapered bars all debris to easily fall through

Standard mesh has a 70% open area

Mini Mesh has a 45% open area

FRP GRATING PATTERNS

FRP Grating is available in two pattern types (stocked)

STANDARD MESH

38X38MM centre to centre

FRP GRATING FIXING CLIPS