GRP grating

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We have the most advanced means that allow us to manufacture gratings of the highest quality covering any case, no matter how complex, complying with all national and international certifications.

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GRP grating

The Glass fibre Reinforced Plastic is a combined material made up of a matrix of resin and reinforced with glass fibre filaments. The latter provides the compound mechanical strength, dimensional stability and thermal resistance. For its part, the resin provides dielectric strength and chemical resistance and ensures durability against external agents.

What is GRP?

Fiberglass reinforced polyester: Polyester: Resin, which like many others, is derived from petroleum and obtained by a chemical process. The different types of resin that can be obtained from crude oil have multiple applications in the industry. Fiberglass: Material based on silicon dioxide and with a thread-like appearance. In addition to being used as an insulating material, it is also used in polymeric products as a reinforcing agent. Reinforced: This term refers to the process by which fiberglass is joined with polyester, giving the final product strength and higher quality. These three elements perfectly define the characteristics of the GRP grating. We can also find this product with the acronym «GRP» (Glass reinforced plastic) or in a more everyday language, plastic or polyester grids. The grid is only one of the many products that are manufactured with these petroleum products, and is that in the industry are used such materials that for their cost, Polyvalence and efficiency have multiple advantages over others that have been used throughout history. As an example we can mention the automotive industry, where elements such as carbon or different polymers have increasingly prominence in the manufacture of components. This change occurs because with these elements you get stronger parts, higher quality or significantly reduce costs (some can be manufactured in 3D printers) and enters into the constant evolution of the industry to create more efficient products.

GRP grating manufacture

GRP grating is manufactured in prefabricated moulding tables with the shape that is intended to be given to each module. Due to this manufacturing methodology, a uniform block with bidirectional resistance is obtained on each GRP tramex part. Once finished, they can be cut to offer a customized product with the required shape.


One of the great advantages of GRP is undoubtedly its resistance to corrosion and to many of the chemical agents as well as to salinity. This is a good thing for its use in certain industries or where these chemical agents are found as well as in coastal areas. Another point we have to mention is that it is self-extinguishing, a prerequisite for certain facilities to comply with current legislation. Besides, it doesn’t conduct electricity. Finally, in terms of load it has an advantage derived from the way in which it is manufactured, and this is that it supports the load bidirectionally as it is a uniform block where both plates are resistant. This avoids possible errors in the assembly with the placement of the grilles on the supports and it should be added that when the GRP grating is cut it does not lose its resistance capacity.


One of the main disadvantages of the GRP grating is that its components are not recyclable, unlike steel which can be reused almost infinitely. In a context where we are increasingly familiar with terms like carbon footprint or global warming, Among others, the use of non-recyclable or polluting materials can pose a problem regarding the social responsibility of companies and therefore their assessment or external perception, in addition to the pollution itself that is generated and its consequences. All this is accentuated in a context where actions to reduce emissions, consumption and pollution at the company level are increasingly important. Another disadvantage is the type of resin that makes up the grid, since there are different and each one has properties that depending on the application you intend to give, can serve or not. It is more a matter of having clear the type of product that is being purchased.

Uses of the GRP grating

As we have already mentioned, the GRP is not only used for grating, but we can find pipes, railings, log covers and even beams. Within their uses and observing their characteristics, the most common are corrosive environments such as ships or water treatment plants, whether on platforms, floors or stairs.

Types of GRP grating

As with metal grating, GRP grating is also manufactured with different widths or heights both to meet regulations or load requirements. We also find GRP «blind», a grid completely covered by a sheet that makes it opaque and within the different types, we find sandblasted and tearing, the choice of one and the other will depend on the degree of slipperiness required.

When does it replace metal grating

After all of the above and by way of conclusion, We can say that the GRP replaces the metal grid for those situations in which the environment to which it is going to be exposed is highly corrosive and the galvanizing is not a sufficiently durable protection or the option of stainless steel increases the cost too much. In short, the choice of plastic grating or metal will depend on the use and needs that are required which will make one or the other more suitable.

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