Polymer Technology
Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its

Elasticity
Weathering characteristics
Strength
Plasticity

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Polymer Technology
Polyvinyl chloride (PVC)

Can be made thermosetting by adding a plasticiser
Is produced by polycondensation reaction
Softening temperature is 200°C
Uses either emulsion or suspension polymerisation methods

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