Polymer Technology
Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?

Butyl rubber
Silicon rubber
Nitrile rubber
Silicone rubber

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Polymer Technology
Thermocole (expanded polystyrene) is not used for

High temperature thermal insulation in furnaces
Accoustic control and ceiling for building
Low temperature thermal insulation as in refrigerator and air conditioners
Packing of delicate electronic gadgets

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