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7 polymers g rare or complex

d In pairs, take turns to describe an object using the words from Exercise 5c and the
phrases in the box. Ask your partner to guess what it is.
comprise consist of made from made of made out of
c Margit, a sales engineer, is describing a high-voltage cable. Before you listen, label the
cross-section with the parts (a-e).

a insulation
b waterproof membrane
c outer jacket
d armoured protection
e conductor

d 2.3 Read the description and check your answers in Exercise 6c.

Margit: So, in terms of the main components, the conductor, at the centre, is copper or
aluminium, depending on the model. That’s then coated with polyethylene insulation and
surrounded by steel wire, which provides the armoured protection. As the steel obviously needs
to be protected from moisture, there's a plastic waterproof membrane around that. Then, the
whole thing's surrounded by an outer jacket which, again, is in plastic-based material.

e Match the parts of the cable (a-e) in Exercise 6c to the following categories of materials
(1-5). You will need to use some parts more than once.
1 non-metallic a
2 metallic
3 ferrous metal .
4 non-ferrous metal
5 polymer-based .

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