Where do raw materials come from, and how are they turned into usable stock?
The sources and origins of materials and how they are converted into workable forms, including the growth and conversion of timber, the extraction and refining of metals, and the production of polymers from crude oil.
A focused answer to AQA GCSE Design and Technology specialist principle on the sources and origins of materials, covering how timber, metals and polymers are sourced, extracted and converted into usable stock.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
This is AQA section 3.2.4. AQA wants you to know where raw materials come from and how they are processed into the stock forms designers use. You need to describe the growth and conversion of timber, the extraction and refining of metals from ore, and the production of polymers from crude oil. In Paper 1 this is examined by asking you to describe a processing sequence in order and link it to sustainability.
Timber
Conversion has two common methods: through-and-through (slash) sawing is quick and wastes little but the boards can warp, while quarter sawing cuts radially to give more stable boards with attractive grain, at higher cost and waste. Seasoning removes moisture either slowly by stacking timber to air dry outdoors, or quickly in a heated kiln. Properly seasoned timber is stable, stronger, lighter, less likely to rot and ready to glue and finish. Because managed forests replant what they fell, timber stays a non-finite (renewable) resource, and certification (such as the FSC) shows it was sourced responsibly.
Metals
Iron is extracted by smelting iron ore (iron oxide) with carbon (coke) in a blast furnace, where the carbon removes the oxygen to leave molten iron. Reactive metals such as aluminium are extracted instead by electrolysis, which uses a large electric current and so a great deal of energy. The pure metal is often alloyed: adding carbon to iron makes steel, adding chromium makes stainless steel, and copper with zinc makes brass. Extraction, refining and mining use large amounts of energy and damage habitats, and ores are finite, so recycling metals (which needs far less energy than fresh extraction) is a major sustainability gain.
Polymers
Most polymers (plastics) are made from crude oil, a finite resource. Crude oil is first separated into fractions by fractional distillation in a tower, where the lighter fractions rise higher. The useful fractions (such as naphtha) are cracked into smaller, reactive molecules called monomers (for example ethene), which are then joined into long chains by polymerisation to form polymers such as polythene. Because polymers come from finite oil and many are slow to break down, bio-polymers from plant starch (PLA) and recycled plastics are growing alternatives.
Exam-style practice questions
Practice questions written in the style of AQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AQA 20204 marksDescribe how timber is processed from a growing tree into the planks a designer can use.Show worked answer →
A 4-mark Describe wants the stages in order. Markers reward correct sequence and correct terms.
First the tree is grown, usually in a managed forest where trees are replanted so timber stays renewable. When mature it is felled (cut down) and the branches removed. The trunk is then converted by sawing into planks and boards; the two main methods are through-and-through (slash) sawing, which is cheap but can warp, and quarter sawing, which gives more stable, better-figured boards.
The sawn timber is then seasoned (dried) to reduce its moisture content, either slowly by air drying or quickly in a kiln, so it is stable and less likely to warp, split or rot in use.
Markers reward (1) grown and felled, (2) converted by sawing into planks, (3) seasoned or dried to reduce moisture, (4) the reason seasoning prevents warping. Missing seasoning is the most common lost mark.
AQA 20183 marksExplain why metals must be extracted and refined before they can be used, and name one process used.Show worked answer →
A 3-mark Explain wants the reason plus a process.
Most metals are not found pure in the ground; they occur combined with other elements as ores (for example iron as iron oxide). The metal must be separated from the ore, which is why extraction is needed, and then refined to remove impurities so it has the properties a designer relies on. A common process is smelting in a blast furnace, where iron ore is heated with carbon (coke) so the oxygen is removed, leaving molten iron. Aluminium is extracted by electrolysis instead.
Markers reward (1) metals occur as ores combined with other elements, (2) extraction separates the metal, (3) a named process such as smelting in a blast furnace or electrolysis. Saying metals are dug up ready to use loses marks.
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Sources & how we know this
- AQA GCSE Design and Technology (8552) specification — AQA (2017)