OCR GCSE Design and Technology: material considerations - a complete overview

What this topic actually demands

Material considerations is the materials knowledge at the core of J310's written exam, and it underpins every making decision in the NEA. OCR groups materials into six categories, and for each you must know the types, their physical and working properties, common examples and typical uses, then be able to select and justify a material and cost it from stock forms. The marks come from precise property knowledge, applying it to a named product, and a costing calculation.

This guide walks through all seven subtopics, then sets out the J310 exam patterns. Each subtopic has a matching dot-point page with worked exam questions; this overview ties them together.

Papers and boards

Made mainly from wood pulp and measured in gsm (grams per square metre, weight per square metre, where above ~200 gsm is board). Papers include cartridge, layout, tracing, grid and bleed-proof; boards include corrugated card (protection), mounting board (rigid), foam board (light models), duplex (cheap packaging) and solid white board (premium cartons). Choose by matching stiffness, strength, printability and cost to the job.

Timbers

Hardwoods (broadleaved trees: oak, beech, balsa) are usually denser and dearer; softwoods (coniferous: pine, spruce) are lighter and cheaper; the split is botanical, not about hardness. Manufactured boards (plywood, MDF, chipboard) come in large stable sheets with no grain or knots and are often cheaper, ideal for flat-pack panels.

Metals

Ferrous metals contain iron (mild steel, cast iron); they are magnetic and rust unless protected. Non-ferrous metals contain no iron (aluminium, copper, zinc); they resist rust. Alloys mix metals for better properties (stainless steel, brass, solder). Choose by weighing strength, weight, corrosion resistance, conductivity and cost.

Polymers

Thermoforming polymers (thermoplastics: acrylic, polypropylene, HDPE, PET) soften and reshape repeatedly, so they recycle; thermosetting polymers (epoxy, melamine, urea formaldehyde) set permanently by cross-linking, so they resist heat but cannot be remelted. Choose by weighing rigidity, toughness, heat resistance, insulation and recyclability.

Textiles

Fibres are natural (cotton, wool), synthetic (polyester, nylon, elastane) or blended (polyester-cotton combines comfort and easy care). Fabrics are woven (stable, frays), knitted (stretchy, ladders) or non-woven (bonded, no fray). Both fibre and construction shape the properties.

Electronic components

Resistors control current; sensors (LDR, thermistor) are inputs; capacitors store charge; diodes pass current one way and LEDs emit light (outputs, needing a series resistor); transistors switch (the process); ICs and microcontrollers combine or program many functions. Components combine as input, process and output.

Selecting and costing materials

Selection weighs function, properties, aesthetics, cost, availability and sustainability, and these often conflict. Materials come in stock forms (sheets, bars, rods, tubes, rolls, pellets) and standard stock sizes. Material cost is the quantity used times the price per stock unit, allowing for waste and buying whole stock items, a set J310 calculation.

The exam patterns OCR repeats

J310/01 tests this topic with short recall (name a material for a use, what gsm means), Explain questions (ferrous versus non-ferrous, why a blend, why a thermoset), and a costing calculation from stock forms. Always give a property-based reason for a material choice, apply it to the named product, and show working and units in costing questions.

For the official specification

OCR publishes the full specification (J310), past papers and exemplar portfolios at ocr.org.uk. Always revise from the current specification and OCR's own materials, because question style and command words are board-specific.