Which of the following processes develops cross-links in elastomer?

Vulcanization is the chemical process of heating natural rubber with sulfur to improve its physical properties. During this process, sulfur forms cross-links between the polyisoprene chains of the elastomer, which makes the rubber harder, stronger, and more elastic.

Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting.

Polymerization is the process of forming a polymer from monomers.

Hydration is the addition of water molecules to a substance.

Answer: vulcanization