Polymer Technology
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?

Rosin
Phosphorous
Carbon black
Pine oil

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Polymer Technology
Synthetic rubber

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

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