CAS No. 68611-44-9
EC No. 271-893-4
Synonyms Amorphous Colloidal Silica; Amorphous Silica

Fumed silica HB-139

Fumed silica HB-139 is a hydrophobic fumed silica treated with a dimethyl silicone fluid. This surface treatment results in a hydrophobic silica with a different performance than untreated silica and the Product acts as a rheology modifier imparting good thickening efficiency, sag resistance and anti-settling. 


  • Rheology control agent
  • As thickener and a thixotrope in adhesives and sealants
  • Sag resistance
  • Anti-setting


Shelf Life

Under proper storage conditions, the shelf life is 24 months.

Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet).