IS 7020. also known as polymeric sulfur, is a high-performance vulcanizing agent widely used in the rubber industry. It is a mixture of polymerized sulfur and orthorhombic sulfur, which is insoluble in rubber. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

IS 7020 is a yellow powder with a high content of insoluble sulfur. It is insoluble in elastomers, which helps to retard bin scorch, prevent sulfur migration, and preserve surface tack. It has excellent thermal stability and non-staining properties.

Performance

Vulcanization Agent: IS 7020 is a non-blooming vulcanizing agent for unsaturated elastomers. It de-polymerizes to soluble sulfur at vulcanization temperatures, behaving similarly to "Rubber Maker's" sulfur.

Improved Flowability and Dispersibility: IS 7020 has improved flowability and dispersibility, making it easier to handle and reducing dustiness.

Low Migration Rate: IS 7020 has a low migration rate, uniform dispersion, and a long scorch time, which improves the adhesion between copper-coated steel wire and rubber.

Applications

Tires: IS 7020 is widely used in tire manufacturing, particularly in tire treads and sidewalls, to improve static ozone resistance and flexural fatigue resistance.

Rubber Products: It is used in various rubber products such as hoses, belts, and seals to enhance their durability and resistance to environmental factors.

High-Performance Rubber Products: IS 7020 is ideal for rubber compounds with high sulfur loading, especially when the added sulfur exceeds the solubility of soluble sulfur.

Packaging and Storage

IS 7020 is typically packaged in paper/plastic bags with a net weight of 25 kg per package. It should be stored in a cool, dry place with good ventilation, avoiding direct sunlight and moisture. The product has a shelf life of one year when stored properly.

Safety and Handling

IS 7020 is classified as a combustible material. It may form combustible dust concentrations in air, so it should be kept away from heat, sparks, and open flames. Proper handling and storage are essential to ensure its safe and effective use.

Precautionary Statements:

P210: Keep away from heat/sparks/open flames. No smoking.

P243: Take precautionary measures against static discharge.

P501: Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations.

Conclusion

IS 7020 is a versatile and high-performance vulcanizing agent with a wide range of applications in the rubber industry. Its improved properties, such as delayed action and high anti-scorching quality, make it particularly suitable for products requiring high performance and durability. Proper handling and storage are essential to ensure its safe and effective use.