11 Glass have few textures and colours.

12 Glass is heated to its melting point 1300ºC

13 Plastics are hard, resistant and very elastic so that can be stretched easily

14 The mechanical recycling of plastics requires five stages: separation and crushing, floating, soaking, agglutination and pelletising.

15 Nowadays, the majority of plastics are biodegradable

11 What of these shaping techniques are used to make glass?

12 What of the following is not a thermoplastic?

13 Polyuretane is

14 What of these fibers are used to reinforce plastics?

15 How are plastics generally classified?