Specialist material principles
Design & Technology · GCSE · The School
Why this section is different
Every GCSE D&T candidate sits the same CORE content, then a SPECIALIST section in one material area chosen by their school: timber, metals, polymers, textiles, papers and boards, or electronic systems. The specialist content genuinely differs, so it cannot be written once — but the QUESTIONS each area asks are the same, and those can.
The questions every area asks
Whatever the material: what are its working properties and how do they limit the design? How is stock supplied, and in what standard sizes? What processes shape it, join it and finish it, and what does each need? What are its scales of production? How does it fail, and how is it protected? How is it sourced and disposed of? Answer those six for your material and you have the specialist section.
Find your own requirements
Ask your teacher which material area your school enters, then download that board's specification and read the specialist section — AQA, Pearson Edexcel, OCR and Eduqas all publish theirs free. Write the six questions above down the page and fill them in for your material. That is a revision plan built from the actual assessment rather than a guess.
Every material area asks the same five things: where does it come from, what forms is it sold in, how is it shaped, how is it joined, and how is it finished? For TIMBERS: forests; planks and manufactured boards; sawing and planing; screws, glue and joints; sanding and varnish. For POLYMERS: crude oil; granules and sheet; injection moulding and vacuum forming; welding and adhesives; usually self-finishing. Learn the five questions and you can answer for whichever area you are entered.
Working properties versus physical properties
The specialist paper separates these and candidates blur them. PHYSICAL properties belong to the material itself — density, conductivity, melting point, absorbency. WORKING properties describe how it behaves when you do something to it — malleability, ductility, hardness, toughness, elasticity. Hardness and toughness are the pair most often confused: hardness resists scratching and denting, toughness resists cracking under a sudden blow. Glass is hard and not tough; mild steel is tougher and softer. A question asking for one will not accept the other.
Justifying a material choice
'I chose ash because it is strong' earns almost nothing, because nearly everything is strong enough for something. A justification needs the property, a number or comparison where you have one, and the reason it matters for THIS product and THIS user. 'Ash for the handle: a tough hardwood that resists splitting along the grain under repeated twisting, and it finishes smooth enough not to raise splinters for a user with thin skin.' Two named properties, both tied to how the product is actually used.