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Keeping surfaces separated

Anti blocking

Coated surfaces or layers, especially those recently coated, have a tendency to stick together. When this happens, they are often ruined. Preventing this from happening is called anti-blocking. When added to coating formulations, colloidal silica gives surfaces an anti-blocking capacity for two main reasons:

  1. Colloidal silica makes surfaces more hydrophilic, causing more moisture to be retained by surfaces during drying, which reduces their tackiness.
  2. Considered small “glass particles,” colloidal silica resists high temperatures (SiO2 has a melting point of about 1650ºC) and even under high temperature particles stay discrete and do not fuse.

Colloidal silica benefits

  • Increased heat resistance
  • Controllable drying times
  • Reduced shrinkage during drying
  • Excellent water retention
  • Safe handling
  • Easy to use

Common industry applications

Please contact us for advice on which colloidal silica products are best for your specific industry applications.