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

Silicone rubber
Butyl rubber
Silicon rubber
Nitrile rubber

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Polymer Technology
Dacron is a

Thermosetting material
Condensation polymerisation product of dimethyl terephthalate (DMT) and ethylene glycol
None of these
Condensation polymerisation product of hexamethylene diamine and adipic acid

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