There are two different types of silicas: precipitated and fumed. Precipitated silica has been around longer than fumed. However, both compounds have unique properties.
Heat Treated Precipitated Silica - Eureka
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Silica nanoparticles mediated insect pest management - ScienceDirect
What Is Silica?: Fumed Silica and Precipitated Silica - Van Horn, Metz & Co. Inc.
Emulsions Manufacturers and Suppliers in the USA
Our unique portfolio: We are the only supplier to offer both fumed and precipitated silica and metal oxides. - Evonik Industries
An innovative approach to utilize waste silica fume from zirconia industry to prepare high performance natural rubber composites for multi-functional applications - ScienceDirect
Our unique portfolio: We are the only supplier to offer both fumed and precipitated silica and metal oxides. - Evonik Industries
Precipitated Silica - an overview
Silica Fume - an overview