OCCL

 Rubber is the main raw material in the manufacturing of tires. Industry uses both natural and synthetic rubber for the purpose. To maintain the quality of rubber sulfur content is one of the most important parameters.  Raw rubber is a hydrocarbon in nature and is a thermoplastic. In order to eliminate the undesirable property of malodorousness, treating rubber with sulfur, other accelerators, and antioxidants are necessary. Which in turn helps to prolong the life of rubber product tires in this case.  However, being crystalline organic sulfur is somewhat soluble in polymers (rubber). Mixing ordinary sulfur to the natural rubber will be of no use as it will dissolve during the hot mixing process. Later after cool-down, it will form the crystallized surface, causing the sulfur to bloom. This might not affect the function of the rubber product but it will mess up the appearance of the product.  To prevent this undesirable effect of sulfur blooming , insoluble sulfur is used in Rubber. Be

 Crystex™ HD OT 20 is a non-blooming vulcanizing agent for unsaturated elastomers. This is essential in the manufacturing of tires and other rubber goods.  Major Application And Properties: Crystex HD OT 20 is polymeric sulfur and is insoluble in elastomers. Consequently, it will retard bin scorch, limit migration of sulfur to conserve surface tack.  Crystex™ HD OT 20 might be added in vulcanization temperatures. Crystex™ HD OT 20 is a metastable product that can regress to soluble sulfur if not stored under proper conditions.  Crystex™ HD OT 20 is a special grade insoluble sulfur with improved flowability and dispersibility.  Reversion of Crystex™ HD OT 20 is added to soluble sulfur to act like catalyzed for alkaline products. As the presence of alkaline accelerators can be perilous. How To Store It Always make sure to store Crystex™ in a well-ventilated area below 30°C and avoid exposure to direct sunlight. Keep the products away from products that can emit amines such as sulfenamid

 Rubber blooming refers to the phenomenon that a liquid or solid compounding agent is moved from the inside of the rubber to the surface of the rubber causing whitening of the rubber product. Apart from the discolouration and poor appearance of rubber and its article rubber blooming could also lead to the loss of adhesion.  Rubber is the one main component for tyre manufacturers, and they might not be concerned about the appearance of their rubber tyre. However, the fact blooming can cause the loss of adhesion, increase the chances of contamination, and decrease the life of rubber is why they try to prevent the blooming. How they do so? To prevent rubber blooming, insoluble sulfur is the most preferred choice in the tyre industries. There are several manufacturers of insoluble sulfur, such as OCCL that provide high-grade insoluble sulfur products and help tyre industries to present the most durable tyre to us.

 Vulcanization is a chemical process that is used to convert natural rubber and some polydiene elastomers into cross-linked polymers. Sulfur is considered to be the most common vulcanizing agent. Being a homopolymer and can create long chains easily with the individual polymer molecules when heated with rubber. Insoluble Sulfur is one of the most common vulcanizing agent for rubber used by the tyre industries to harden the rubber and increase its longevity.   The main purpose of using vulcanizing agents is to prevent the rubber from blooming. As, blooming in the finished products of rubber article can lead to contamination and reduce the life duration of rubber and its products. Companies like OCCL India are providing the widest range of high-grade insoluble sulfur. 

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.

Blooming is the movement of some of the major compounding additives on the rubber surface when their concentration exceeds their solubility limit in the same rubber matrix. Main causes of Blooming in rubber are: Excess dosage of Sulphur, heat, prolonged storage. How to Resolve blooming issue in rubber? Since Sulfur or RMS is a monomer, it tends to bloom (come out of rubber compound) when it is stored for a longer duration of time. To prevent blooming , Insoluble sulfur is used in Rubber. Being a homopolymer, it is a long chain compound, hence it doesn’t come out of a rubber compound when stored over a longer period of time (Say up to 15 days). Blooming problem can be resolved using Insoluble sulfur over RMS or normal sulfur. 

 Blooming in scientific terms means the migration of some of the compounding additives to the rubber surface when their concentration exceeds their solubility limit in that rubber matrix. Major Reasons for Blooming in rubber are Excess dosage of Sulphur, heat, prolonged storage. How to Prevent Sulfur Blooming To prevent sulfur blooming , Insoluble sulfur is added in rubber instead of Sulfur or RMS, where Dosage is usually more than 1.5 PHR. Sulfur blooming affects rubber quality. Since the tyres have higher volumes of metal; It requires strong rubber to metal bonding. Also, the thickness of compounds is very less: the probability of blooming increases.  Hence a higher dose of Insoluble Sulphur is used. In general, Insoluble sulfur is added instead of Sulfur or RMS to prevent blooming, where Dosage is usually more than 1.5 PHR.

Insoluble Sulphur is the polymeric state of Sulphur that is used in the form of a vulcanizing agent in the rubber industry. It protects the rubber compound from blooming, which is the migration of Sulphur onto the surface of the product. This poses a huge challenge for compounders since adhesion among several components of rubber product goes for a toss. Insoluble sulphur , by way of not migrating on the surface, aids in better tackiness among rubber components. In radial tire, where rubber to metal bonding is required, Insoluble sulfur plays a critical role. Almost all tyre majors across the globe use insoluble sulfur in Radial tyres.