Dear Reader, you have in front of you the fourth Frontiers issue of Rubber Chemistry and Technology.

The Frontiers issue was created to focus attention on very topical subjects and on the results of cutting edge research, publishing papers from invited authors who can provide a contribution and are leaders in the field of rubber. The objective of the Frontiers issue is to keep you updated and to stimulate interest, curiosity, debate and further research. It is an honor and a pleasure for me to serve as guest editor of this fourth Frontiers issue.

Rubber is a fundamental material, irreplaceable for such needs of human beings as health, energy, and movement. In many different sectors, rubber has been used for so long that one may think, erroneously, that its applications have been defined and that rubber products are mature and do not need creative thinking and innovation. Instead,...

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