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Answer for the clue "Process of treating rubber or rubberlike materials with sulphur at great heat to improve elasticity and strength or to harden them ", 13 letters:
vulcanization

Alternative clues for the word vulcanization

Word definitions for vulcanization in dictionaries

WordNet Word definitions in WordNet
n. process of treating rubber or rubberlike materials with sulphur at great heat to improve elasticity and strength or to harden them [syn: vulcanisation ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Vulcanization \Vul`can*i*za"tion\, n. [See Vulcan .] The act or process of imparting to caoutchouc, gutta-percha, or the like, greater elasticity, durability, or hardness by heating with sulphur under pressure.

Wikipedia Word definitions in Wikipedia
Vulcanization or vulcanisation is a chemical process for converting natural rubber or related polymers into more durable materials by the addition of sulfur or other equivalent curatives or accelerators . These additives modify the polymer by forming cross-links ...

Wiktionary Word definitions in Wiktionary
n. A process by which rubber is hardened using heat and sulphur.

Usage examples of vulcanization.

The overtapping was evident by 1853, just eight years after the vulcanization process expanded the rubber market (Coates, 58-9).