The big idea: Materials are also classified by their source or origin: natural or human-made.
Natural materials are taken from living or geological sources and processed. Human-made materials are manufactured from refined or synthesised feedstock.
The families on each side — and, in the later steps, the four structure types this statement also covers.
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Natural
- Timbers — oak, pine, bamboo
- Textiles — cotton, wool, linen (though many are synthetic)
- Biomaterials — mycelium, PLA, starch foams
- Usually renewable, often biodegradable
- But: properties vary between samples
Human-made
- Metals — refined from ore: steel, aluminium
- Polymers — ABS, PP, PET
- Glass, composites, smart materials
- Manufactured to a specification, so properties are consistent
- But: energy and extraction behind them, and most do not break down
The line is not sharp: A textile may be natural or synthetic. A composite may contain both. Source alone never decides a selection — it is one input among the properties.
Timber: the natural material the papers ask about
Renewable
Trees can be replanted and regrown, so timber from managed forests is renewable. Plastic, metal and glass come from finite resources.
Strong for its weight
Timber is strong and durable along the grain, which is why it is used for beams, chairs and tool handles.
Attractive grain
The natural grain pattern gives every piece a different look: an aesthetic reason to choose it.
Needs protection
Timber absorbs moisture, so outdoor timber is chosen for weather resistance (such as oak or cedar) or protected with a finish.
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This statement also asks you to discuss structures — how a product carries its loads. It is a separate idea from source, sharing one statement.
Frame
Loads carried through a skeleton of linear members, with the spaces between open or filled by something non-structural. Light for its strength, uses little material, and one member can be replaced. A bicycle, a roof truss, a tent.
Shell
No internal skeleton — the outer skin carries the load, usually because it is curved. Encloses and protects, and uses very little material for the volume it contains. An egg, a bottle, a car body panel, a cycle helmet.
Solid
Material all the way through. Heavy and uses the most material, but resists compression and wear extremely well and is simple to make. A brick, a chopping board, a hammer head.
Combination
Most real products. A car is a frame chassis plus shell body panels plus solid brake discs. The exam answer names which part of the product is which — not one label for the whole thing.
How this is tested — classifying by source, and identifying frame, shell, solid and combination structures. It comes up two ways:
Paper 1 — multiple choice
- Classify a named material as natural or human-made.
- Identify the structure type of a described product.
Paper 2 — analysing a product
- Discuss the structures used in a named product.
- Explain why a designer chose a frame over a shell.
The trap: Giving one structure label for a whole product. Almost every product is a combination — say which part is which, and why each type suits that part.
A folding garden chair has a tubular metal frame, a moulded seat pan and solid plastic feet. Analyse the structures used and why each suits its part.
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