Polymer Technology
Polyurathane can not be used to make

Coating and adhesive
Fibre reinforced plastic (FRP)
Automobile cushion
Thermal insulation in refrigerator

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Polymer Technology
Synthetic rubber

Is softer at higher temperature
Is brittle at low temperature
Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Deforms, if stretched to double of its original dimension

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