Here you'll discover everything you need to know about GRP gratings.
What is GRP?
GRP is a strong, durable and lightweight construction material that can be a substitute for steel, wood or plastic. To find out more about GRP, visit our What Is GRP page.
What does GRP stand for?
GRP stands for Glass Reinforced Plastic (GRP). It is a composite material, or fibre-reinforce polymer, created using a plastic reinforced by fine fibres made of glass. The composite material is commonly referred to as Fibreglass.
Why use GRP?
GRP has many desirable properties, including a high strength-to-weight ratio, strong durability, flexibility in shape/colour/texture, easy maintenance, long-life expectancy and total resistance to corrosion. As a result of these qualities, it is an extremely useful material for a wide range of applications in a number of different industries. Applications for composites are rapidly evolving. Reduced mass, corrosion resistance and superior weight-strength ratios offer significant benefits in the built environment. From an initial range of niche uses to industry-wide delivery, the potential for implementation is limited only by creative design and imagination.
Is GRP expensive?
GRP is an economical material. Compared to stainless steel, GRP is more affordable and, as a result of its long-life expectancy, it is a worthwhile investment for businesses.
Why is GRP used?
The use of GRP is growing. As more and more industries discover the desirable properties of this material, its use is expanding. GRP is beginning to replace materials including steel and wood. It is a safe material to use where electricity, chemicals, corrosive substances or heavy loads are regularly in the vicinity. These composites have generated exciting results in bridges, buildings, structures and retro fitting protective profiles because they are are lighter, stronger and quicker to build.
Is GRP waterproof?
GRP is waterproof, making it ideal for use on roofs, boats and other outdoor applications.
Is GRP UV resistant?
GRP has a high resistance to ultraviolet light.
Is GRP a thermoplastic?
GRP is made using a thermosetting resin. This means that it can only be heated up and shaped once. This is different to a thermoplastic, which can be heated and shaped repeatedly. By using a thermosetting resin, this prevents any melting/dripping should the product be exposed to high heats.
Is GRP a thermal insulator?
GRP can be made as a thermal insulator. This is achieved by using a special type of glass fibre together with the plastic.
Is GRP flammable/combustible?
Many of the chemicals used in GRP production are harmful and hazardous, and this includes flammable substances. However, GRP can be custom-made to be fire resistant by using different resins which are not flammable. GRP includes non-sparking qualities which means it can be used on sites where combustible gases may be used. View our fire resistance data here.
Is GRP acid resistant?
GRP can be made resistant to different types of acid. It depends on the acid type and the concentration used as to the effect it may have on the product. View our chemical resistance data here.
Is GRP durable?
GRP is an extremely durable material. It is used in a variety of different applications precisely because of this quality, including construction yards, railways and engineering. It can withstand poor weather conditions with minimal suffering and has a long-life expectancy, regardless of wear and tear.
What is Pultruded GRP?
The process of pultrusion creates continuous lengths of GRP. The process is efficient, eco-friendly and low in cost. Pultruded GRP has a high durability and is light and quick to build. Our pultruded profiles are manufactured using the pultrusion process, or the “pulled” process. The raw material is pulled through a step by step process.
Stage 1: This starts by pulling in two forms of fibreglass reinforcement. Creels of fibreglass roving provide uni-directional strength along the length of the profile, and rolls of woven fibreglass mat provide multi-directional reinforcement.
Stage 2: The fibreglass reinforcements are then pulled through a bath of thermoset resin, typically polyester or vinyl ester.
Stage 3: A surface veil is added to enhance the surface appearance of the final product just before it is pulled into the heated dye.
Stage 4: Wet-Out reinforcements are pulled through the heated dye, which allows the resin to cure and harden. Once it comes away from the dye, a solid, rigid profile is produced in the exact shape of the dye cavity, which has been formed with all the reinforcements laminated inside. It can then be cut to specification.
For more information, visit our GRP Pultruded Profiles page and discover more about this product.
Is GRP a composite material?
GRP is a composite material. Sometimes called a fibre-reinforced polymer (FRP), it is made from glass fibres that reinforce the plastic used.
Are FRP and GRP the same?
No. GRP stands for Glass Reinforced Plastic, and it is a type of FRP (Fibre-Reinforced Plastic). However, the two terms are often used interchangeably.
What is the difference between FRP and GRP?
GRP stands for Glass Reinforced Plastic, and FRP stands for Fibre Reinforced Polymer. In essence, the key difference is that GRP specifically uses glass fibres combined with plastic and a resin. It is just one type of FRP.
What does FRP stand for?
FRP stands for Fibreglass Reinforced Polymer, also known as composites. These are a combination of resin (such as polyester and vinyl ester), reinforcements (such as fibreglass roving and mat) and additives (such as pigments, UV inhibitors, fire retardants and surface veils). Fibreglass has the strength of steel at a fraction of the weight. It will not corrode, rot, warp, attract insect damage or conduct electricity. It can be formed into countless FRP Profiles to fit your specification. The dense fibre core makes the structural shapes hard and strong, and their absolute values of vertical flexible strength and impact strength are higher than those of common steels.
Will using GRP save time?
The installation process for GRP saves a considerable amount of time. GRP is easily fitted into a vast range of different environments and is long-lasting, meaning that it doesn’t requiring replacing soon after its installation. GRP products save time and money without the need for any heavy lifting gear/cranes or hot works /welding. GRP grating, sheets, stair nosings, tactile pavers and pultruded profiles are not labour-intensive. They can be simply bolted, glued and screwed in place and this drastically saves on the overall time it takes to install GRP.
How long does GRP last?
The life-expectancy of GRP products can vary from 25 years to 100 years and over. GRP is extremely long-lasting and survives well, even in environments which suffer from constant wear and tear.
Is GRP paintable?
You can paint GRP using fibre paint, but first you need to know if you are painting directly onto the gelcoat or onto a previously painted surface. If you are painting onto a gelcoat, then make sure the surface is clean. You can use a brush, roller or spray, depending on the area you need to paint. If you are painting onto a previously painted surface, ensure you have removed the previous paint by sanding the surface carefully. Depending on what you are painting, this will influence the qualities of the paint (such as whether it needs to be waterproof). Make sure you research this carefully before purchasing your paint.
What are GRP textured panels?
GRP Anti-slip panels are large sheets of flat GRP. They can come in a variety of different colours and finishes, including textured, and can be made to suit specific requirements. Textured panels are often required in areas of high footfall, or in environments in which surfaces have the potential to become wet and slippery. Textured panels offer a safe surface to walk on due to their superior slip-resistance quality. For more information, visit our GRP Sheets and Panels page and discover more about this product.
Why use GRP grating?
GRP grating has a number of benefits when compared to other materials, such as steel for example. These include:
- Being a non-corrosive, low maintenance material. This means that it will not rust or suffer from wear and tear.
- A high impact resistance. Should a heavy object fall onto it, no damage will be caused.
- GRP is light and easy to handle. This means it is very easy to install, but once in place it is strong and can withstand huge weights.
- GRP can have a variety of different finishes, including a textured finish which is slip-resistant. This is ideal in a workplace environment, where employee safety should be considered at all times. Whereas steel grating would become slippery when wet, GRP does not, making it a much safer choice. Have a look at our GRP Grating page for more information on this product.
- Although the initial cost of GRP is greater than that of steel grating, the maintenance cost is virtually non-existent. Combined with the long-life expectancy, overall GRP works out as the cheaper option.
What features should I consider when choosing GRP grating?
When deciding what GRP grating to choose, make sure you fully understand its application. Make a note of the environment it would be fitted into (e.g. wet conditions, slippery, low-lighting) and the size of the area you require the grating for. Also, consider the load the grating would need to bear (e.g. people, heavy trucks or cranes).
How is GRP grating made?
Moulded grating is often referred to as GRP or FRP grating.
Moulded grating offers different grating designs but the general structure is the same.
The mould includes a mould cavity, ejector pin de-moulding system, heating system and the base. To produce a GRP grating panel, there is a three-stage process:
Stage 1: The mould cavity is the core part of the whole mould. It is composed of a face-plate, mould block and side close.
Stage 2: The ejector pin de-moulding system is composed of the ejector pin cover and support frame.
Stage 3: The heating system is the essential system of moulded grating. The polyester resin is cured hard after heating. This heating system is composed of electric heating tubes and the connecting system, which connects the inner heating system with the exterior heating system.
Why use GRP handrails?
GRP handrails have a number of benefits. These include being easy to assemble in a number of environments including stairwells, walkways and ramps. They are very strong, lightweight and easy to maintain. They are safe to use in areas which handle chemicals and corrosive substances. They also do not require painting and, therefore, save on maintenance costs. For further information on our GRP Handrails, visit our page and discover more about the benefits of this product.
Is GRP sustainable?
GRP is a plastic, and plastics are generally assumed to be unsustainable for the environment. This is true for plastics including PVA and PVC, which are considered to be the worst in terms of sustainability. This is because they break down fast in outdoor environments. Although this sounds beneficial, it means that the product is absorbed into the earth quicker and pollutes the ground faster. However, the resins used in GRP are far stronger than other plastics. This means that they do not break down in the same way as other, more common, types of plastic. Most GRP products have a lifespan of over 50 years, with some over 100 years, which results in the product being better for the environment and better for businesses budgets too.
Is GRP recyclable?
GRP can be recycled. However, the facilities able to recycle it are not common. There has been a surge in research and the development of technology in order to re-use and recycle GRP, and this is seeing some excellent progress.
Are there any GRP product guarantees/warranties?
We will replace the defective material free of charge provided that:
- The anti-slip treads or decking have been installed and maintained in accordance with the written instructions of Gripclad Limited.
- The anti-slip treads or decking have been subject to normal wear and tear and have not been subject to physical misuse.
- The registration form is completed in all respects and returned to Gripclad Limited. The customer has paid in full the agreed invoice value within agreed payment terms with Gripclad Limited.
The warranty does not extend to: Impact damage caused by items other than normal foot traffic or wheeled traffic (i.e. dropped tools or equipment, dragging of heavy metal objects across the surface.)
The warranty does not extend to: Damage caused by corrosive materials not detailed within the technical data section of our brochure and/or tested by Gripclad Limited prior to installation. If customers are concerned then we recommend that they undertake their own tests.
The warranty does not extend to: Markings from cigarettes or other burning agents or staining of the surface. Liability for failure or damage to the material by circumstances beyond Gripclad Limited control, including failures due to flooding, storm damage or the failure of the sub-floor. Gripclad Limited shall investigate any claim made under this warranty and shall only be liable under the terms of this warranty if such investigation shows that the anti-slip treads or decking have been installed and maintained according to the specification. The liability of Gripclad Limited is limited to supplying, free of charge, sufficient material to replace that found to be defective. Nothing in this warranty affects your statutory rights.
Before we can reply fully on warranties we would need clarification on the following:
- What is the product going to be applied to?
- What is the condition of the surface currently?
- What fixings are to be used?
- Describe the environment - External, Internal, Oily, Wet, Dry, Inclined or Declined Surfaces etc.
- Foot Traffic Type & Frequency?
- What chemicals would be used, if any?
Do GRP products comply with building regulations?
Before beginning any project, always have a discussion about how to ensure that the GRP products you need to install are made to comply with building regulations. Feel free to contact us if you have any further questions, or would like to discuss any specific requirements with us.
If you have any other questions about GRP, what it can be used for, our product range or specific industry-related questions, please feel free to get in touch and we will be more than happy to assist you.