Introduction to HD OT 20 (CAS 9035-99-8)

HD OT 20. also known as high-dispersibility insoluble sulfur, is a specialized vulcanizing agent used in the rubber industry. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

HD OT 20 is a yellow powder with high thermal stability and non-staining properties. It is insoluble in elastomers, which helps to retard bin scorch, prevent sulfur migration, and preserve surface tack.

Performance

Vulcanization Agent: HD OT 20 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: HD OT 20 has improved flowability and dispersibility, making it easier to handle and reducing dustiness.

Low Migration Rate: HD OT 20 has a low migration rate, even dispersion, and a long scorch time in rubber, which improves the adhesion between copper-coated steel wire and rubber.

Applications

Tires: HD OT 20 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: HD OT 20 is ideal for rubber compounds with high sulfur loading, especially when the added sulfur exceeds the solubility of sulfur in the elastomer.

Packaging and Storage

HD OT 20 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.

Safety and Handling

HD OT 20 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

HD OT 20 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