Materials, properties and scales of production
Material questions are never about naming a material. They are about justifying one against the demands of a specific product.
Lesson overview
What you'll learn in this lesson
Select materials and processes with justification for a given design context.
Key learning points
- • Physical and working properties
- • Material families
- • Scales of production
- • Sustainability
This lesson at a glance
- 30 minutes
- 20 parts to scroll through
- 4 quick checks
- Marked quiz at the end
- Gentle pace: short sittings with pauses
Words to know
Scroll down — the lesson carries on below
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Part 1 of 20
Visual introductionPicture this
Materials, properties and scales of production
Material questions are never about naming a material. They are about justifying one against the demands of a specific product.
In a nutshell
Select materials and processes with justification for a given design context.
Learning cycle
Part 2 of 20
Learning cycle 1 of 2
Part 1 · Physical and working properties
A short piece of teaching, then a check to make sure it has landed.
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Part 3 of 20
Learn
Physical and working properties
Physical properties include density, conductivity and absorbency. Working properties include strength, hardness, toughness, malleability, ductility, elasticity and durability. Toughness resists sudden impact; hardness resists scratching — a distinction examiners test repeatedly.
Reset break
Part 4 of 20
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Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.
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Part 5 of 20
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Material families
Papers and boards, natural and manufactured timbers, ferrous and non-ferrous metals and alloys, thermoforming and thermosetting polymers, and natural and synthetic textiles. Thermoforming polymers can be reheated and reshaped; thermosetting polymers cannot, because they cross-link permanently on curing.
Quick check
Part 6 of 20
Quick check
Part 7 of 20
Reset break
Part 8 of 20
Pause
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Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.
Learning cycle
Part 9 of 20
Learning cycle 2 of 2
Part 2 · Scales of production
A short piece of teaching, then a check to make sure it has landed.
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Part 10 of 20
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Scales of production
One-off, batch, mass and continuous production. Scale drives process choice: vacuum forming suits low volumes because moulds are cheap, while injection moulding suits high volumes because the expensive mould cost is spread across thousands of units.
Explore the idea
Part 11 of 20
Learn
Sustainability
Use the six Rs — refuse, reduce, reuse, repair, recycle, rethink — plus life-cycle assessment covering raw material extraction, manufacture, distribution, use and disposal. A strong answer names the stage of the life cycle affected by the choice.
Reset break
Part 12 of 20
Pause
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Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.
Quick check
Part 13 of 20
Quick check
Part 14 of 20
Explore the idea
Part 15 of 20
Worked example
Model answer: 'Justify the choice of injection moulding for a mass-produced casing' (6 marks)
Injection moulding is appropriate because the product is required in high volume, and although the steel mould is expensive to make, that cost is divided across hundreds of thousands of units, giving a very low cost per item. The process produces complex shapes with consistent wall thickness and an excellent surface finish straight from the mould, so no secondary finishing is needed, which reduces both cost and production time. It also suits thermoforming polymers such as polypropylene, which can be reground and reused, reducing waste. It would be the wrong choice for a one-off prototype, where vacuum forming or 3D printing avoids the tooling cost entirely.
Reset break
Part 16 of 20
Pause
That's sitting 4 of 5 done
Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.
Challenge round
Part 17 of 20
Game · Sort it
Which of these are true?
Drag each card into the right column. Tap a card first if dragging is fiddly.
True
Not true
Challenge round
Part 18 of 20
Game · Recall cards
Which property resists sudden impact?
Card 1 of 4
Mastery quiz
Part 19 of 20
Marked quiz
End of lesson quiz: Materials, properties and scales of production
4 questions, marked with the reasoning shown. No timer.
1. Which property resists sudden impact?
2. Which polymer type can be reheated and reshaped?
3. Why does injection moulding suit mass production?
4. What does a life-cycle assessment consider?
Lesson round-up
Part 20 of 20
Lesson round-up
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