What are the main categories of material and the properties that decide where each is used?
Material categories - ferrous and non-ferrous metals, thermoplastics and thermosetting plastics, hardwoods, softwoods and manufactured boards, and composites - and their working properties.
A CCEA GCSE Technology and Design answer on material categories - ferrous and non-ferrous metals, thermoplastic and thermosetting polymers, hardwoods, softwoods and manufactured boards, and composites - and the working properties that decide which material to choose.
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What this dot point is asking
CCEA wants you to classify materials into the main categories - metals (ferrous and non-ferrous), polymers (thermoplastic and thermosetting), timber (hardwood, softwood and manufactured board) and composites - and to describe the working properties that decide which material suits a job. Material choice underpins every manufacturing decision.
The answer
Metals: ferrous and non-ferrous
Metals are generally strong, tough, good conductors of heat and electricity, and can be recycled. An alloy is a mixture of a metal with other elements to improve properties - steel and brass are alloys.
Polymers: thermoplastic and thermosetting
Polymers are light, good electrical and thermal insulators, available in many colours, and resistant to water and many chemicals. The key examinable contrast is that thermoplastics can be remoulded while thermosets cannot.
Timber: hardwoods, softwoods and manufactured boards
Hardwood and softwood describe the tree type, not literally how hard the wood is. Manufactured boards are widely used because they are dimensionally stable and come in large sheets, though MDF and chipboard are weaker at edges and joints.
Composites
Properties that decide the choice
A material is chosen by matching its working properties to the job. Important properties include:
- Strength - resists a load without breaking.
- Toughness - absorbs impact without shattering (the opposite of brittleness).
- Hardness - resists scratching and wear.
- Durability - resists corrosion, rot and weather over time.
- Malleability - can be shaped or bent without cracking.
- Density - mass per unit volume (matters when weight is important).
- Conductivity - of heat and electricity (metals conduct; polymers insulate).
Worked example: choosing a material from its properties
Examples in context
- Example 1. A bicycle frame
- Aluminium (non-ferrous, light, corrosion resistant) or carbon-fibre composite (very strong for its weight) are chosen over mild steel because low weight matters, showing density and durability driving the choice.
- Example 2. A kitchen worktop
- A laminate over chipboard (manufactured board) is cheap, stable and comes in large flat sheets, while a hardwood worktop is chosen when appearance and durability matter more than cost.
- Example 3. A plug casing
- A thermosetting plastic is used because it insulates electrically, is tough, and will not soften with the heat of the current, a direct property match.
Being able to place a material in its category and justify a choice by property turns "use plastic" into the precise reasoning CCEA rewards.
Try this
Q1. Name one ferrous and one non-ferrous metal. [2 marks]
- Cue. Ferrous: mild steel, cast iron or stainless steel. Non-ferrous: aluminium, copper or brass.
Q2. What is the key difference between a thermoplastic and a thermosetting plastic? [2 marks]
- Cue. A thermoplastic can be reheated and reshaped; a thermosetting plastic sets permanently and cannot be remoulded.
Q3. Give one example of a manufactured board. [1 mark]
- Cue. Plywood, MDF or chipboard.
Q4. Define the property toughness. [1 mark]
- Cue. The ability to absorb impact or sudden loading without shattering.
Q5. Why is a composite such as GRP used instead of a single material? [2 marks]
- Cue. Combining materials (glass fibres in resin) gives properties better than either alone - strong yet light.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA style4 marksExplain the difference between a ferrous and a non-ferrous metal, giving one example of each.Show worked answer →
A ferrous metal contains iron and so is usually magnetic and will rust unless protected (1). Example: mild steel (1).
A non-ferrous metal contains no iron, so it does not rust in the same way and is not magnetic (1). Example: aluminium or copper (1).
CCEA style4 marksA designer must choose a material for an outdoor bench seat. Explain two properties they should consider.Show worked answer →
Durability and weather resistance (1): the bench is outdoors, so the material must resist rain, sun and rotting or rusting over time (1).
Strength and toughness (1): the seat must support the weight of people without bending or breaking, so it needs enough strength and toughness for repeated loading (1).
Markers also accept cost, appearance, ease of working or sustainability with valid reasoning.
Related dot points
- Smart and modern materials: shape memory alloys, thermochromic and photochromic materials, quantum tunnelling composite and other responsive materials, and their uses.
A CCEA GCSE Technology and Design answer on smart and modern materials: shape memory alloys, thermochromic and photochromic pigments, quantum tunnelling composite and other materials whose properties change in response to a stimulus, and where they are used.
- Shaping and forming processes: marking out, wasting (cutting and drilling), deforming and reforming such as line bending, vacuum forming and injection moulding.
A CCEA GCSE Technology and Design answer on shaping and forming processes: marking out, wasting (sawing, filing, drilling), deforming such as line bending, and reforming processes including vacuum forming and injection moulding of plastics.
- Joining and assembly: permanent and temporary joins - adhesives, mechanical fixings, knock-down fittings, soldering, brazing and welding, and timber joints.
A CCEA GCSE Technology and Design answer on joining and assembly: the difference between permanent and temporary joins, adhesives, mechanical fixings and knock-down fittings, soldering, brazing and welding for metals, and common timber joints.
- Finishing techniques: why surfaces are finished, and finishes for timber, metal and plastic - varnish, paint, oil, polish, anodising, plating and self-finishing.
A CCEA GCSE Technology and Design answer on finishing techniques: why surfaces are finished, surface preparation, and the finishes used for timber, metal and plastic, including varnish, paint, oil, polish, anodising, plating, and self-finishing materials.
- Design influences and sustainability: consumer demand, the market, consumer law and standards, and designing sustainably using the six Rs.
A CCEA GCSE Technology and Design answer on the factors that influence design - consumer demand, the market, customer expectations, consumer law and standards - and on designing sustainably using the six Rs to reduce environmental impact.
Sources & how we know this
- CCEA GCSE Technology and Design specification — CCEA (2017)