Why Sulfur Blooming Is Bad And How To Stop It?

Why Sulfur Blooming Is Bad And How To Stop It?

In general terms, Sulfur blooming means the migration of sulfur, on the surface of a rubber article either before or after vulcanization. Due to the fact that blooming in the finished product can lead to contamination and reduces the life duration of rubber and its products. This is why sulfur blooming is considered an undesirable process by the tyre and rubber manufacturing companies.



Then how to stop sulfur blooming?

To prevent sulfur blooming, tyre and rubber industries use insoluble sulfur. These industries add insoluble sulfur instead of sulfur or RMS which is a monomer. On the other hand, insoluble sulfur is a homopolymer and can create long chains easily. Usually the dosage of insoluble sulfur to be added in the rubber is more than 1.5 PHR. However, in case of tyre manufacturing, a higher dosage of insoluble sulfur is used. The reason is simple, tyres have a higher volume of metal, which requires strong rubber to metal bonding.


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