Percentage of added materials like sulphur, zinc lead etc in vulcanised rubber

Q.  What is the percentage of added materials like sulphur, zinc lead etc in vulcanised rubber?
- Published on 18 Dec 15

a. 5 – 10 %
b. 3 – 5 %
c. 4 – 8 %
d. 10 – 12 %

ANSWER: 3 – 5 %

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