GRP stands for Glass Reinforced Plastic. It is also called fibreglass, composite plastic and FRP. It is strong, extremely light and highly versatile. GRP behaves differently to the conventional thermoplastics that are commonly used in everyday items. This means that it has properties which make it an extremely useful material for a huge range of applications within many industries.
What is FRP?
FRP stands for Fibre-Reinforced Polymer. FRP is a composite material formed of polymer matrix reinforced with fibres. Although the fibres used are usually glass fibre, as in GRP, others such as carbon, aramid or basalt are also utilised.
FRP is a broader general term more often applied to engineering materials used in a wide range of industrial applications. The term FRP is, however, often used interchangeably when referring to GRP.
What is GRP made of?
GRP is made from strands of glass called fibres. These are extremely fine fibres that are woven together to create a flexible fabric. GRP is a moulded product, meaning it must be placed in or around the shape of the item it is required to take. GRP composite incorporates aluminum oxide aggregate surface, which is diamond hard, and offers a high resistance to long-term wear.
With GripClad products, the anti-slip grit cannot be knocked out as happens with over-coating methods. No peel-back or chipping can occur around localized damage points, the colour cannot be worn off and flexing/movement will have no effect. With both GRP and FRP materials, there is a 100% guarantee that it cannot rust or corrode.
These products are pre-finished, ready to install plates/covers constructed from extremely robust composite GRP. All our products are bonded together in a single manufacturing process making for the strongest and most durable pedestrian safety product available today.
GRP grating is produced through a moulding method, whereas GRP handrailing and pultruded profiles are produced by the pultrusion method.
GRP stair tread covers, GRP sheeting and GRP stair nosings are constructed from a base mix of fire retardant polyester resins interspersed with layers of immensely strong interwoven glass fibre. The colour pigmentation is floated right through the full thickness of the material so that it is impossible for the colour to wear off and become unsightly. The fused alumina anti-slip grain is then forced, under pressure, into the base mix while it is still wet, followed by a final resin layer laid over the top of it all. This entire composite mix is then cured at optimum temperatures until fully hard. No layering, no bonding, no weak spots, just one immensely strong composite, solid product.
What are the properties of GRP?
GRP has a number of valuable properties, making it extremely useful in industries all over the world. These properties include:
- Thermal insulation
- Anti-slip safety
- High strength-to-weight ratio
- Does not melt, but burns similarly to wood (it can be produced fire retardant if required)
- High energy absorption
- Chemical resistance
- Corrosion resistance
- Can be used in enclosed electrical spaces
- Good insulation to heat and sound
- Easy to shape
GRP is a useful material for a variety of different reasons. Regardless of the application you require it for, or the industry you work in, GRP is a long-lasting and reliable product.
What is GRP used for?
GRP is used in a range of different applications. In many industries, there is a use for a product made partially or entirely from GRP. For example:
- Water pipes or drain coverings
- Anti-slip protection for retrofitting dry and wet flooring
- Helicopter rotor blades and wind turbine blades
- Electronic enclosures
- Safety grating in industrial and public areas
- Sporting equipment such as kayaks
There are many other uses of GRP. With such diverse application, GRP is a popular and reliable product. For more industry-specific information on the uses of GRP, have a look at our industry pages and find out more about how we use it.
What is GRP Pultrusion?
Pultrusion is a manufacturing process for producing continuous lengths of reinforced polymer structural shapes with constant cross-sections.
The process is as follows:
After being saturated in matrix materials (such as unsaturated polyester resin), reinforced materials (such as textile reinforcing fibres and fibreglass continuous mat), is pulled by pultrusion equipment and harden through dies. This process ensures that pultruded GRP structural shapes are produced with smooth surface, stable size and high strength.
Pultruded GRP structural shapes are made from densely packed continuous fibreglass, which is wrapped by a layer of fibreglass mat.
The dense fibre core makes the structural shapes hard and strong, and their absolute values of vertical flexural strength and impact strength are higher than those of common steels.
The use of fibreglass mat also increases the transversal strength of the structural shapes and helps form a rich resin layer on the surface so that they are resistant to corrosion and cracking.
If you have any questions on GRP and how it can be used, feel free to contact us and we will be happy to advise you. For information on our GRP products, have a look at our product pages and see where GRP has been installed.