Sulfur vulcanization sulfur is not miscible in the polymer prior to vulcanization and attention is paid to prevent sulfur bloom, where it migrates to the surface of the article. Accelerators act much like catalysts allowing vulcanisation to be performed cooler yet faster and with a more efficient use of sulfur. They achieve this by reacting with and breaking the sulfur ring to form a reactive intermediate, referred to as a sulfurating agent. This in turn reacts with cure sites in the rubber to bring about vulcanization. There are two major classes of vulcanization accelerators: primary accelerators and secondary accelerators (also known as
The Sulphur Institute Symposium. The symposia are attended by producers, consumers, and traders in sulfur, as well as industry service providers, and feature speakers discussing a range of topics relating to sulfur. The 2010 Sulphur World Symposium was held in Doha, Qatar, from April 12 through April 15, 2010. The 2010 symposium featured a tour of the Ras Laffan Industrial City, which is not normally available to the public. Publications by The Sulphur Institute include market studies, industrial publications, general brochures about sulfur, and brochures on the agricultural uses of sulfur. Symposium proceedings are also available. Most publications are available in English, with