1. Positive-Charge Series – Hydrophobic Fumed Silica
Surface Characteristics
Special silicone surface treatment gives a positive (+) charge tendency.
Hydrophobic surface reduces moisture absorption, maintaining powder flowability.
Positive charge works synergistically with negatively charged toner particles for stable electrostatic attraction.
Advantages in Toner
Enhances tribo-charging performance of positive-charging toner for consistent print density.
Maintains charge stability under high-humidity conditions, reducing toner agglomeration.
Improves dispersion and flowability, minimizing clogging and caking.
Extends service life of photoconductors and developer rollers.
Typical Applications
Positive-charging toners used in high-speed printers and copiers.

2. Negative-Charge Series – Hydrophobic Fumed Silica
Surface Characteristics
Surface-treated to impart a negative (−) charge tendency.
High hydrophobicity keeps toner dry and free-flowing over extended storage.
Negative charge interacts effectively with positively charged toner particles.
Advantages in Toner
Improves charging performance of negative-charging toner, achieving stable charge levels faster.
Reduces background fogging during printing, enhancing contrast and sharpness.
Maintains stable charge distribution under high temperature and humidity.
Minimizes toner deposition inside devices, extending maintenance cycles.
Typical Applications
Negative-charging toners used in laser printers and copiers.

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