CBS (CZ), also known as N-Cyclohexyl-2-benzothiazole sulfenamide, is a widely used rubber accelerator known for its high activity and delayed action. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

CBS (CZ) is a grayish-white powder or granule with a slight odor and is non-toxic. It has a density of 1.31-1.34 g/cm³ and a melting point range of 90-108°C. It is soluble in benzene, methylene chloride, carbon tetrachloride, ethyl acetate, and acetone, but insoluble in water and gasoline.

Applications

CBS (CZ) is a medium-fast primary accelerator suitable for natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), halogenated butyl rubber (HR), and ethylene-propylene-diene monomer (EPDM). It is known for its outstanding delayed action, making it effective and safe at ordinary processing temperatures without causing scorching. It is particularly suited for use with furnace black materials that have higher alkalinity and minimal color and pollution.

Packaging and Storage

CBS (CZ) is typically packaged in 25 kg plastic woven bags, paper bags lined with plastic film, or jumbo bags. It should be stored in a dry, cool place with good ventilation, avoiding direct sunlight. The product has a shelf life of one year.

Safety and Handling

CBS (CZ) is classified as a hazardous substance with the following hazard statements:

H302: Harmful if swallowed.

H315: Causes skin irritation.

H319: Causes serious eye irritation.

Precautionary Statements:

P261: Avoid breathing dust/fume/gas/mist/vapors/spray.

P280: Wear protective gloves/protective clothing/eye protection/face protection.

P305 + P351 + P338: If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.

P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.

Conclusion

CBS (CZ) is a versatile and high-performance rubber accelerator 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.