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This lesson brings together everything you have learned about materials and their properties for AQA GCSE Design and Technology (8552), Section 3.1.6. It provides exam-style questions, model answers and material selection strategies.
| Category | Sub-categories | Key Examples |
|---|---|---|
| Papers & boards | Paper, board | Cartridge paper, corrugated card, foam board, mount board, duplex board |
| Timber | Hardwood, softwood, manufactured board | Oak, beech, pine, cedar, plywood, MDF, chipboard |
| Metals | Ferrous, non-ferrous, alloys | Mild steel, stainless steel, cast iron, aluminium, copper, brass, pewter |
| Polymers | Thermoplastics, thermosets | Acrylic, PP, HDPE, PET, ABS, nylon, epoxy, melamine, polyester resin, UF |
| Textiles | Natural fibres, synthetic fibres | Cotton, wool, silk, linen, polyester, nylon, acrylic, elastane |
graph TD
M[Materials AQA 8552]
M --> PB[Papers & Boards]
M --> T[Timbers]
M --> ME[Metals]
M --> PO[Polymers]
M --> TX[Textiles]
PB --> PB1[Cartridge / Layout / Tracing]
PB --> PB2[Corrugated / Foam / Mount / Duplex / SBS]
T --> T1[Hardwoods: Oak, Beech, Mahogany, Balsa]
T --> T2[Softwoods: Pine, Spruce, Cedar, Larch]
T --> T3[Manufactured: Plywood, MDF, Chipboard, Hardboard]
ME --> ME1[Ferrous: Mild Steel, Stainless, Cast Iron, HSS]
ME --> ME2[Non-Ferrous: Aluminium, Copper, Tin, Zinc]
ME --> ME3[Alloys: Brass, Bronze, Pewter, Duralumin]
PO --> PO1[Thermoplastics: Acrylic, PP, HDPE, PET, ABS, Nylon]
PO --> PO2[Thermosets: Epoxy, Melamine, Polyester, UF]
TX --> TX1[Natural: Cotton, Wool, Silk, Linen]
TX --> TX2[Synthetic: Polyester, Nylon, Acrylic, Elastane]
Q: Name the category of material (ferrous metal, non-ferrous metal, thermoplastic, thermosetting polymer, hardwood, softwood, manufactured board) for each of the following: (a) Acrylic (PMMA) (b) Oak
Model Answer: (a) Thermoplastic (1) (b) Hardwood (1)
Q: Define the following material properties: (a) Malleability (1 mark) (b) Toughness (1 mark) (c) Ductility (1 mark)
Model Answer: (a) Malleability is the ability of a material to be permanently deformed by compression (hammering, pressing, rolling) without cracking. (1) (b) Toughness is the ability of a material to absorb energy and resist fracture when subjected to impact or shock loading. (1) (c) Ductility is the ability of a material to be drawn (stretched) into a wire or thin shape without breaking. (1)
Q: A designer is creating a children's outdoor climbing frame. Recommend a suitable metal for the main structural tubes and justify your choice.
Model Answer: I would recommend mild steel (with a galvanised or powder-coated finish). (1)
Mild steel has high tensile strength, meaning the tubes will resist the pulling forces created when children hang and swing from the frame without deforming or breaking. (1)
Mild steel is also malleable and ductile, so the tubes can be bent and formed into the required shapes during manufacture. (1)
However, mild steel rusts when exposed to rain and moisture, so it must be galvanised (coated with zinc) or powder-coated (coated with a durable plastic finish) to protect it from corrosion in the outdoor environment. (1)
Q: Explain two differences between thermoplastics and thermosetting polymers. For each difference, give an example.
Model Answer:
Difference 1: Thermoplastics can be repeatedly heated and reshaped because they have weak intermolecular forces between their polymer chains. For example, acrylic can be heated with a strip heater and line-bent into a new shape. Thermosetting polymers cannot be reheated and reshaped because they have permanent cross-linked bonds. For example, melamine formaldehyde will char and decompose if overheated. (2)
Difference 2: Thermoplastics are recyclable — they can be melted down and reformed into new products. For example, PET bottles are recycled into polyester fleece fabric. Thermosetting polymers are not recyclable by melting because their cross-links cannot be broken. For example, epoxy resin in a carbon fibre composite cannot be melted and reused. (2)
Q: A furniture maker is designing a garden bench. Explain why they might choose Western Red Cedar rather than beech.
Model Answer: Western Red Cedar is naturally resistant to rot, decay and insect attack because it contains natural oils that act as preservatives. This means it can be used outdoors without requiring chemical treatment, reducing maintenance costs and environmental impact. (2)
In contrast, beech has poor outdoor durability — it is susceptible to rot when exposed to moisture and would need regular treatment with wood preservative to survive in a garden setting. (1)
Cedar is also lightweight, making the bench easier to move, and its attractive reddish-brown colour and natural aroma make it aesthetically pleasing for garden furniture. (1)
Q: Explain why MDF is a suitable material for flat-pack furniture that will be painted.
Model Answer: MDF has a smooth, uniform surface with no grain pattern, knots or defects, which provides an excellent base for paint — the finish appears even and professional. (1)
MDF is easy to machine using CNC routers, allowing complex profiles (e.g. decorative edges) to be cut accurately and consistently for batch production. (1)
MDF is available in large, consistent sheets (standard 2440 × 1220 mm), making it efficient to cut multiple identical components with minimal waste. It is also cheaper than solid hardwood. (1)
Q: For each product below, state the most important material property and explain why.
(a) A car bumper (2 marks) (b) A cooking pan base (2 marks)
Model Answer: (a) The most important property for a car bumper is toughness — the ability to absorb energy from an impact without fracturing. (1) This is because the bumper must protect the car and its occupants during low-speed collisions by deforming and absorbing the kinetic energy of the impact rather than shattering and causing further damage. (1)
(b) The most important property for a cooking pan base is thermal conductivity — the ability to conduct heat efficiently. (1) The pan base must transfer heat from the hob to the food quickly and evenly to ensure uniform cooking. Copper and aluminium are excellent thermal conductors and are commonly used for pan bases. (1)
When selecting a material for a given product, consider:
| Factor | Questions to Ask |
|---|---|
| Function | What forces will the product experience? What properties are essential? |
| Aesthetics | What should the product look like? Colour, texture, finish? |
| Cost | What is the budget? Is a cheaper alternative acceptable? |
| Manufacturing | How will the product be made? Does the material suit the process? |
| Environment | Is the material sustainable? Recyclable? Biodegradable? |
| Availability | Is the material readily available? Are there supply chain issues? |
| Durability | How long must the product last? Will it be used indoors or outdoors? |
| Safety | Are there toxicity, flammability or sharp-edge concerns? |
AQA Exam Tip: Use this framework (FACED AS — Function, Aesthetics, Cost, Environment, Durability, Availability, Safety) as a mental checklist when answering material selection questions. Covering multiple factors shows breadth of understanding and targets the top mark band.
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