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Bakelite was an early plastic and it one product that used it very quickly was the radio.  Looking at the shapes of these radios why do you think plastic - bakelite was used so much ?
Download the worksheet -  ‘Topic-Doc 2’ for this section and answer question  5.
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One clear disadvantage should be obvious from looking at the radios shown here.  
If you are unsure find one reason by using the link supplied
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Later radios and electronic equipment used improved plastics that had better qualities.  Look at some of these and use the answer doc to list features that make the radios better.    Use ‘Topic-Doc 2 ’ and answer question 6.
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Think of product that you use now - many have plastic cases.  Why is this ?  
..... answer question 7
                            on the sheet
Bakelite
Radios
Radios - 2