Advantages of Composites

Composites can offer significant advantages over conventional materials when selected and designed for the right application. They are not always the cheapest option upfront; their value lies in qualities such as low weight, strength, corrosion resistance, design flexibility and repeatability. To achieve the best performance and value, a composite product should be designed to make deliberate use of these benefits.

Key Advantages

Design Flexibility

Composites can be moulded into complex shapes and forms that may be difficult or impractical to produce using conventional materials.

Repeatability

Once a mould has been created, multiple components can be produced with consistent shapes and dimensions within normal process tolerances..

Strength-to-Weight Ratio

Composites can provide high strength without excessive weight, making components easier to transport, handle and install.

Fire Performance

Specialist resin systems and additives can improve resistance to ignition and flame spread, with some formulations designed to self-extinguish. Phenolic composites can provide higher fire performance but are more complex and costly to manufacture.

Radio Transparency

Certain fibreglass composite constructions allow radio-frequency signals to pass through with minimal interference, making them suitable for radomes and equipment covers.

Low Thermal Conductivity

Compared with metals, fibreglass composites transfer relatively little heat and can contribute to the thermal insulation of a product or structure.

Low Electrical Conductivity

Fibreglass composites are generally non-conductive, providing electrical insulation and additional safety in suitable applications.

Chemical & Weather Resistance

With the correct resin and finish, composites can resist moisture, corrosion, weather exposure and many chemicals without rotting, rusting or spalling.

Colours & Finishes

Gelcoats are available in a wide range of colours and finishes. Composite components can also be painted when a specialised colour or surface treatment is required.


Diagram illustrating the key properties and advantages of composite materials

Design Freedom


Composite materials can be used for both decorative and structural applications and moulded to complement architectural styles ranging from Gothic and Edwardian to Art Deco and contemporary design. Their low weight can reduce cranage, fixings and loading on the supporting structure, making transportation and installation easier.

Design Considerations


Composites deliver the greatest value when a product is designed around their particular properties rather than treated as a direct substitute for a conventional material.

• Composites are not always the cheapest option, but they can provide a cost-effective long-term solution.

• A component can be strong without being stiff, so its shape, reinforcement and core construction must suit the application.

• Thermal movement must be allowed for during design and installation.

• Dark colours absorb more heat and can increase thermal movement, so colour selection and joint design should be considered.

• Curves, folds and other formed shapes can add stiffness while taking advantage of the material’s mouldability.

Fibreglass mould of an ornamental column capital for the Wellington Town Hall restoration project
Blue fibreglass mould for a decorative relief panel