Crystex™ insoluble sulfur
Crystex™ insoluble sulfur

Eastman Crystex insoluble sulfur

Eastman is one of the world's largest producers of chemicals for the rubber and tire industry. These rubber chemical products help control the process of manufacturing rubber, while improving its durability, flexibility, and appearance.

A critical step in converting raw rubber to finished rubber is the process of vulcanization. Vulcanization is the method of treating rubber with sulfur at great heat to improve the elasticity and strength of rubber. One of the key products in the Eastman portfolio is Crystex™ insoluble sulfur.

Insoluble Sulfur

Insoluble sulfur is the vulcanizing agent of choice for the tire industry. Crystex is a polymeric form of sulfur that is a non-blooming vulcanizing agent for rubber. By being insoluble in rubber, Crystex prevents sulfur migration and, in turn, bloom which interferes with the tire building process. The use of insoluble sulfur is critical for the manufacture of quality radial tires.


Eastman has a proud history of developing new technologies to answer customer needs and move the industry forward. Eastman collaborates with customers at the global, corporate and local levels to focus its research and development to answer the challenges facing the industry today and in the future. For example, Eastman's Technology Group works closely with customer facilities to continuously develop new and improved production processes. These improvements save time and lower costs to provide customers with a business advantage in today's largely commoditized market.

Crystex in Rubber World 2018
Learn about Crystex Cure Pro in Rubber World article
(English) RW Article - English (Chinese) RW Article - Chinese
The productivity enhancer for tires.
Rubber & Plastics News Article
Learn about Crystex Cure Pro in Rubber & Plastics News Rubber & Plastics News Article
Cure Pro next innovation in Eastman Crystex line.
© 2021 Eastman Chemical Company or its subsidiaries. All rights reserved.
As used herein, ® denotes registered trademark status in the U.S. only.