How do composites and technical textiles combine materials to outperform a single material?
Composite materials (GRP, CFRP, concrete, plywood) that combine a matrix and reinforcement, and technical and performance textiles (Gore-Tex, Kevlar, microfibres, conductive textiles) engineered for specific functions.
A focused answer to WJEC A-Level Design and Technology Unit 3 composite materials and technical textiles, covering how composites combine a matrix and reinforcement (GRP, carbon fibre reinforced polymer, concrete, plywood) and how technical or performance textiles such as Gore-Tex, Kevlar and conductive fabrics are engineered for specific functions.
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What this dot point is asking
WJEC wants you to explain how a composite combines a matrix and a reinforcement to beat a single material, name common composites and their uses, and discuss technical textiles engineered for a function. The exam asks you to define a composite and justify one for a product (carbon fibre frames are a favourite), and to discuss performance textiles such as Gore-Tex and Kevlar. You need the matrix-and-reinforcement idea and a specific benefit for each material.
The answer
What a composite is
The classic gain is a very high strength-to-weight ratio, plus the ability to align the reinforcement to the expected loads so material is placed only where needed.
Common composites
- Glass reinforced plastic (GRP) - glass fibres in a polyester resin matrix. Strong, light, corrosion-resistant and easily moulded. Uses: boat hulls, car body panels, water tanks, slides.
- Carbon fibre reinforced polymer (CFRP) - carbon fibres in an epoxy resin matrix. Very high strength and stiffness for very low weight. Uses: racing bikes, aircraft parts, sports equipment, premium car parts.
- Concrete - stone aggregate bonded by cement; strong in compression. Reinforced with steel bars to add tensile strength for beams and structures.
- Plywood - thin wood veneers glued with the grain at right angles in alternate layers, giving strength and stability in all directions and resisting splitting.
Technical and performance textiles
- Gore-Tex - a membrane whose pores block liquid water but pass water vapour, so outdoor clothing is waterproof and breathable.
- Kevlar (aramid) - extremely strong for its weight; used in body armour, motorcycle clothing, cut-resistant gloves and reinforcement.
- Microfibres - ultra-fine fibres for lightweight sportswear that wicks sweat, and for cleaning cloths.
- Conductive textiles - fabrics with conductive threads for flexible circuits, sensors, touch controls and heated garments.
Examples in context
Example 1. An aircraft wing panel in CFRP. Carbon fibres are laid in the directions of the main loads and set in epoxy, giving a panel far lighter than aluminium for the same stiffness, which cuts fuel use - a direct payoff from aligning the reinforcement to the loads.
Example 2. A breathable waterproof jacket. A Gore-Tex membrane is laminated between the outer fabric and lining, so rain cannot get in but sweat vapour can get out, keeping the wearer dry and comfortable, which a simple plastic raincoat cannot do.
Try this
Q1. Name the two parts of a composite and state the job of each. [2 marks]
- Cue. Reinforcement - carries the load; matrix - binds the reinforcement, transfers stress and protects it.
Q2. Explain why microfibre fabric is chosen for high-performance sportswear. [2 marks]
- Cue. The very fine fibres make it light and soft and let it wick sweat away from the skin and dry quickly, keeping the wearer comfortable during exercise.
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC 20184 marksExplain what a composite material is and why carbon fibre reinforced polymer is used for racing bicycle frames.Show worked answer →
A composite material is made by combining two or more different materials - a reinforcement and a matrix that binds it - to produce a material with better properties than either part alone. The reinforcement carries the load and the matrix holds it in place, transfers stress between fibres and protects them.
Carbon fibre reinforced polymer (CFRP) combines strong, stiff carbon fibres in a tough resin matrix. It is used for racing bicycle frames because it has a very high strength-to-weight and stiffness-to-weight ratio, so the frame is extremely light yet strong and stiff for efficient pedalling. The fibres can also be aligned to the expected loads, so material is placed only where it is needed.
Markers reward the definition (reinforcement plus matrix giving improved properties), and at least the high strength-to-weight ratio with the benefit of a light, stiff frame, with extra credit for fibre alignment to loads.
WJEC 20206 marksDiscuss the use of technical textiles in performance clothing, with reference to two named examples.Show worked answer →
A strong answer names two technical textiles and links each to a function and a benefit.
Gore-Tex is a microporous membrane laminated into outdoor clothing. Its pores are too small for liquid water droplets to pass but large enough for water vapour, so it is waterproof yet breathable, keeping the wearer dry from rain while letting sweat escape. This improves comfort and safety in the outdoors.
Kevlar (an aramid) is an extremely strong, cut and abrasion resistant fibre. Woven into motorcycle clothing or protective gloves, it resists tearing and abrasion in a crash or against sharp edges, protecting the wearer while staying flexible and far lighter than a metal alternative.
Other valid examples include microfibres for lightweight wicking sportswear and conductive textiles for wearable electronics and heated clothing. Markers reward two correct materials, the engineered property of each, and a clear performance benefit.
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Sources & how we know this
- WJEC AS/A Level Design and Technology specification — WJEC (2017)