How are the materials used in product design classified, and what are their defining features?
The classification of materials: papers and boards, natural and manufactured timbers, ferrous and non-ferrous metals and alloys, thermoplastic and thermosetting polymers, elastomers and composites, with named examples and typical product uses.
A focused answer to Eduqas A-Level Product Design on the classification of materials: papers and boards, natural and manufactured timbers, ferrous and non-ferrous metals and alloys, thermoplastics and thermosets, elastomers and composites, with named examples and typical product uses.
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What this dot point is asking
Eduqas wants you to classify the materials used in product design into their families, give named examples and typical products, and explain what defines each group. Classification is the foundation of the materials topic: knowing a material's family predicts its properties, so it is where material selection begins.
Papers, boards and timbers
Metals: ferrous, non-ferrous and alloys
Polymers and elastomers
Composites
Exam-style practice questions
Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Eduqas 20194 marksExplain the difference between a thermoplastic and a thermosetting polymer in terms of their bonding, and name one product example of each.Show worked answer →
A Component 1 short-answer question. Marks for the bonding contrast and for each named example.
A thermoplastic has long polymer chains held together by weak intermolecular (secondary) bonds, so heating softens it and it can be reshaped and recycled many times. Examples and products: acrylic (signs, light covers), polypropylene (chair shells, living hinges), ABS (casings). A thermosetting polymer forms permanent covalent cross-links between its chains when first heated and cured, so it sets hard and cannot be remelted or reshaped. Examples and products: urea formaldehyde (electrical fittings), melamine formaldehyde (worktops, tableware), epoxy resin (adhesives, composite matrix).
The mark is for the bonding: weak intermolecular forces (reversible) versus permanent covalent cross-links (irreversible). A common dropped mark is saying thermosets can be remelted.
Eduqas 20216 marksDiscuss how the classification of a metal as ferrous, non-ferrous or an alloy helps a designer choose a metal for a product. Use examples to support your answer.Show worked answer →
A Component 1 extended question marked by levels of response. Reward the classification, examples and link to selection.
Ferrous metals contain iron, so they are usually magnetic and prone to rust unless protected (mild steel for car bodies, cast iron for vices and machine bases). Non-ferrous metals contain no iron, so they resist rust and many are light or good conductors (aluminium for aircraft and cans, copper for wiring, zinc for galvanising). Alloys are mixtures engineered for better properties (stainless steel resists corrosion for cutlery and sinks, brass for fittings, duralumin for strong light parts).
Knowing the class predicts behaviour (corrosion, weight, conductivity, cost) so the designer can match metal to product. A top answer explains the classification, gives examples, and judges that classification is a quick guide to properties but the final choice still weighs cost, manufacture and finish, reaching a clear conclusion.
Related dot points
- The physical and mechanical properties of materials (strength, hardness, toughness, ductility, malleability, elasticity, plasticity, density, conductivity, durability) and how they govern the suitability of a material for a product, including the calculation of density.
A focused answer to Eduqas A-Level Product Design on the physical and mechanical properties of materials: tensile and compressive strength, hardness, toughness, ductility, malleability, elasticity, plasticity, density and conductivity, with definitions, the density calculation, and how each property governs material choice.
- Smart materials (shape memory alloys, thermochromic, photochromic and electrochromic materials, piezoelectric and electroluminescent materials) and modern materials (Kevlar, graphene, nanomaterials, polymorph, technical textiles), defined by stimulus and response or by an outstanding property.
A focused answer to Eduqas A-Level Product Design on smart and modern materials: shape memory alloys, thermochromic, photochromic and electrochromic pigments, piezoelectric and electroluminescent materials, plus modern materials such as Kevlar, graphene, nanomaterials and polymorph, each linked to a stimulus and response or an outstanding property.
- The enhancement and treatment of materials: heat treatment of metals (hardening, tempering, annealing), work hardening, seasoning and treatment of timber, lamination and reinforcement, alloying, and surface treatments and finishes that protect or enhance a material.
A focused answer to Eduqas A-Level Product Design on enhancing and treating materials: hardening, tempering and annealing of metals, work hardening, seasoning and preservation of timber, lamination and reinforcement, alloying, and the surface treatments and finishes that protect and enhance a material.
- Selecting materials by balancing function, aesthetics, cost, manufacture, availability and environment, and the standard stock forms (sheet, bar, rod, tube, extrusion, section, granules, powder, wire) that materials are supplied in and how stock form affects waste and cost.
A focused answer to Eduqas A-Level Product Design on selecting materials and stock forms: balancing function, aesthetics, cost, manufacture, availability and environment, the standard stock forms materials come in, and how choosing the right stock form reduces machining and waste.
- The shaping and forming processes for polymers (injection moulding, blow moulding, vacuum forming, extrusion, rotational moulding), metals (casting, forging, die casting) and timber (laminating, steam bending), and how the process suits the material, the form and the scale of production.
A focused answer to Eduqas A-Level Product Design on shaping and forming processes: injection moulding, blow moulding, vacuum forming, extrusion and rotational moulding for polymers, casting and forging for metals, and laminating and steam bending for timber, with the material and scale each suits.
Sources & how we know this
- Eduqas A Level Design and Technology specification (Product Design) — Eduqas (2017)