Eduqas A-Level Product Design materials and their properties: a complete overview

What this theme demands

Materials and their properties is the technical foundation of Component 1. It tests whether you can classify a material, state its properties precisely, calculate its density, recognise smart and modern materials, explain how materials are enhanced and tested, and justify a material choice and stock form for a product. Marks are lost when properties are swapped (hardness for toughness), when a density calculation is left in the wrong units, or when a smart material is named without its stimulus, and gained by tying every material to a named product. This overview ties the six dot-point pages together.

Classifying materials

Materials fall into families. Papers and boards are sheet materials from wood pulp, classed by weight in grams per square metre. Timbers are natural hardwoods (broadleaved) and softwoods (coniferous), plus manufactured boards (plywood, MDF, chipboard). Metals are ferrous (contain iron, rust), non-ferrous (no iron, for example aluminium and copper) and alloys (engineered mixtures, for example stainless steel and brass). Polymers are thermoplastics (weak intermolecular bonds, reshape and recycle) and thermosets (covalent cross-links, set permanently); elastomers are stretchy. Composites combine a matrix and a reinforcement. See classification of materials.

Physical and mechanical properties

Strength resists a force (tensile, compressive); hardness resists scratching and wear; toughness absorbs energy and resists impact; the two trade off, because hard materials are often brittle. Ductility is drawing into a wire; malleability is hammering into sheet; elasticity is springing back; plasticity is keeping a new shape. Density is $\rho = \frac{m}{V}$ in kilograms per cubic metre, the property Component 1 most often asks you to calculate. See properties of materials.

Smart and modern materials

A smart material changes a property in response to a stimulus: shape memory alloys (heat), thermochromic (heat), photochromic (light), electrochromic (voltage), piezoelectric (stress and voltage) and electroluminescent (field). A modern material is defined by an outstanding property: Kevlar (strength-to-weight), graphene (strength and conductivity), nanomaterials and polymorph. See smart and modern materials.

Enhancing, testing and selecting materials

Materials are enhanced and treated: metals are hardened, tempered and annealed; timber is seasoned and preserved; lamination and reinforcement build strength and shape; finishes protect and improve appearance. Material data comes from testing: destructive tests (tensile, impact, hardness) to characterise a material, non-destructive tests (ultrasonic, X-ray, dye penetrant) to check parts without damage. Selection then balances function, aesthetics, cost, manufacture, availability and environment, and chooses a stock form (sheet, bar, tube, extrusion, granules) near the final shape to cut machining and waste. See enhancement and treatment of materials, performance characteristics and testing and selecting materials and stock forms.

How to revise this theme

1. Learn the categories with examples. A named material and product for each family is a recall mark you cannot drop.
2. Get the properties exact. Do not swap hardness and toughness, or ductility and malleability; define each in your own words.
3. Drill the density calculation. Convert lengths to metres, then use $\rho = \frac{m}{V}$, and keep the units.
4. Link smart materials to a stimulus. A smart material is defined by what it responds to, so always name the trigger.
5. Practise selection evaluations. Weigh several factors on a real product, choose a stock form, and reach a justified decision, then attempt the quiz.