How do the form and supply of a material, and its disposal, affect cost and sustainability?
Material costs: the effect of stock form and shape and quantity on cost, and the cost and sustainability of material disposal and recycling.
A CCEA GCSE Engineering and Manufacturing answer on material costs, how the stock form, shape and quantity of a material affect price, and the cost and sustainability issues of disposal and recycling.
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What this dot point is asking
CCEA Unit 3 expects you to know how the cost of a material depends on its stock form, shape and quantity, and to discuss the cost and sustainability of disposal and recycling. This links cost to environmental responsibility.
The answer
How material form and supply affect cost
Disposal, recycling and sustainability
When a product reaches the end of its life, its materials must be disposed of. Sending waste to landfill costs money and harms the environment. Recycling is more sustainable because it:
- Conserves finite raw materials (such as metal ores and oil for plastics);
- Reduces landfill and waste;
- Usually uses far less energy than making material from new (recycling aluminium uses a small fraction of the energy of extracting it).
Recycled material can be cheaper and reduces disposal costs, but it must be sorted and cleaned, and some materials, like thermosetting plastics, cannot be remelted.
Worked example: reducing material cost and waste
Examples in context
- Example 1. Buying steel
- A firm buys standard round bar rather than a custom-shaped billet, because the standard form is far cheaper and close to the part's shape, wasting less in machining.
- Example 2. Aluminium cans
- Recycled because remelting aluminium uses a small fraction of the energy of extracting it from ore, saving money and reducing environmental impact.
- Example 3. End-of-life design
- A product is designed so its metal and plastic parts can be separated and recycled, cutting disposal cost and conserving resources.
The pattern is that cost and sustainability go together: buying standard forms in bulk, minimising waste, and recycling at end of life all lower cost and environmental impact.
Try this
Q1. Give two factors that affect the cost of buying a material. [2 marks]
- Cue. Its stock form and shape (standard versus special), the quantity bought (bulk discount), the material type and availability.
Q2. Give one reason recycling is good for sustainability. [1 mark]
- Cue. It conserves finite raw materials, reduces landfill, or uses less energy than making new material.
Q3. Give one challenge of recycling materials in manufacturing. [1 mark]
- Cue. Materials must be sorted and cleaned, and some (such as thermosetting plastics) cannot be remelted.
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 two factors that affect the cost of buying a material in for manufacture.Show worked answer →
Two factors that affect material cost:
Stock form and shape. A material supplied in a standard stock form (such as plain sheet, round bar or tube) is cheaper than one supplied in a special or complex shape, which needs extra processing and so costs more.
Quantity bought. Buying in larger quantities usually gives a lower price per unit (bulk discount), while small quantities cost more per unit.
Other valid factors: the type of material itself, its availability/supply, and any finish already applied.
Markers reward two valid factors, each explained, for example standard form being cheaper than special shapes, and bulk buying lowering the unit price.
CCEA style4 marksDiscuss why recycling materials is important for sustainability, and give one cost benefit and one challenge of recycling in manufacturing.Show worked answer →
Recycling is important for sustainability because it conserves finite raw materials, reduces waste sent to landfill, and usually uses less energy than making material from scratch (for example recycling aluminium uses far less energy than extracting it), reducing environmental impact.
One cost benefit: recycled material can be cheaper than new raw material and reduces disposal costs.
One challenge: materials must be sorted and cleaned (and some, like thermosetting plastics, cannot be remelted), which adds cost and effort.
Markers reward the sustainability points (conserves resources, less landfill, less energy) plus one cost benefit and one valid challenge.
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