This question is about materials used to make outdoor garden furniture.
Table 1 shows information about two materials used to make garden furniture frames.
Table 1
| Property | Aluminium alloy | Teak wood |
|---|---|---|
| Raw material | aluminium ore | teak tree |
| Cost of frame in £ | 120 | 450 |
| Strength in arbitrary units | 270 | 120 |
| Mass in kilograms | 8.5 | 14.0 |
| Lifespan in years | 15–20 | 20–30 |
| One method of disposal at end of life | recycled to make new products | burned to produce heat energy |
Evaluate the use of aluminium alloy and teak wood for making garden furniture frames. Use Table 1.
Explain why aluminium alloy frames do not need protection from corrosion.
Connecting bolts for outdoor furniture are made from steel (an alloy of iron). These bolts rust without protection. Paint is not used to protect these bolts because of friction and wear. Suggest how these steel bolts can be protected from rusting.
Some garden benches are made from a composite of glass fibres embedded in a polyester resin. What description is given in this composite to: