Bitumen Emulsion CSS1h

Bitumen CSS1h

General Description of Cationic Bitumen  CSS1h

Bitumen CSS1h emulsion, a crucial component in modern road construction and maintenance, comprises three fundamental ingredients: bitumen, water, and an emulsifying agent. Depending on specific requirements, it may also contain additional additives such as stabilizers, coating enhancers, anti-strips, or break control agents. Notably, bitumen and water do not naturally mix, necessitating precise conditions and specialized equipment with chemical additives for emulsion formation.

Emulsion Process

Cationic Bitumen Emulsion CSS-1h is crafted through a meticulous process. A mixture of hot bitumen and water phase is passed through a mechanism involving a rotating disc, cone, or wheel and a stator. This process, known as emulsification, mechanically breaks down the hot binder into minute globules dispersed in water, treated with a small quantity of emulsifying agent. The water acts as the continuous phase while the binder globules are the discontinuous phase, with proper selection of the emulsifying agent and other manufacturing controls ensuring optimal outcomes.

Advantages of Cationic Bitumen CSS1h

The positive charge of cationic bitumen emulsions like CSS-1h enables rapid reactions with aggregates or pavement, facilitating swift stabilization and break. This charge’s size, known as the Zeta potential, affects stability and repulsion dynamics, crucial for achieving the desired properties. Additionally, cationic emulsions offer advantages such as:

  • No need for petroleum solvents, reducing hydrocarbon emissions.
  • Lower viscosity for improved penetration and spreading capacity.
  • Cold application without pre-heating, enhancing safety and cost-effectiveness.
  • Compatibility with damp aggregates and remote cold sites.
  • Wide range of application areas and construction methods.
  • Environmentally friendly and safe for workers’ health.
  • Energy-saving due to low application and storage temperatures.

Applications of CSS1h

Cationic bitumen emulsions like CSS-1h find diverse applications:

Dust control, tack coat, prime coat, fog seal, penetration prime, and cold mix asphalt.

Surface treatments like chip seal, slurry seal, micro surfacing, and structural plant mixtures.

Maintenance mixes, crack filler, joint coating, asphalt sealers, and immediate maintenance solutions.

Selection Considerations

Choosing the right type and grade of emulsion depends on factors like climatic conditions, aggregate type and availability, construction equipment, geographical location, traffic control, environmental concerns, pavement preservation needs, and traffic characteristics.

Packing and Storage

CSS-1h emulsion is typically packed in sturdy steel drums or bulk containers to prevent leaks and ensure safe transportation and storage.

Specification of Bitumen CSS1h





Test Method

Test on Emulsions

Viscosity, Saybolt Furol at 25 °C, SFS




Storage stability test, 24-h, %


ASTM D6930

Particle charge test



Sieve test, %


ASTM D6933

Cement mixing test, %



ASTM D6935


Residue, %



Tests on residue from distillation test:

Penetration, 25°C (77°F), 100 g, 5 s




Ductility, 25°C (77°F), 5 cm/min, cm



Solubility in trichloroethylene, %


ASTM D2042


Download the MSDS of Bitumen Emulsion CSS1H

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