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AEROSIL® fumed silica—an essential in industrial powder technology

Handling of powders, such as dosing, conveying or packing, is everyday’s business in the chemical industry. However, badly flowing or caking powders can cause various problems in production and—even worse—undesirable variations in quality. Other processes require accurate dosing of liquids into a powdery formulation. However, dispersing a liquid homogeneously into a powder is often a challenge. In these cases it is advantageous to convert the liquid into a powder, allowing a much more precise dosing and homogeneous distribution.
AEROSIL® and SIPERNAT® products facilitate all these processing steps significantly, as they help to ensure flowability of powders, minimize caking, or offer the possibility of converting viscous liquids into free flowing powders.
AEROSIL® to ensure flowability and prevent caking of powders

AEROSIL
AEROSIL® and SIPERNAT® products improve the flowability of powders and reduce their caking tendency by enveloping the powder particles, spacing them apart, and thus reducing the cohesive forces. Furthermore, due to their high absorption capacity, they can absorb traces of liquid which are present in the powder mixture.
This improves the flowability further, because any liquid present tends to glue the powder particles together. Several factors, such as the nature of the powder, dosage, order of addition of the ingredients, and applied shear forces, have a crucial influence on the final result and need to be considered when choosing the most suitable grade of SIPERNAT® precipitated silica or AEROSIL® fumed silica.
Detailed information can be found in the brochures TI 1360 “SIPERNAT® and AEROSIL®—an essential in industrial powder technology” and TI 1213 “Performance silica as flow agent and carrier substance—recommended mixing procedures for powders and granulates”.
The following tables give some examples for the versatile applications of SIPERNAT® and AEROSIL® as flow aid.
Examples for AEROSIL® and SIPERNAT® as flow aid and anti-caking agent
Application
Recommended type of AEROSIL
or SIPERNAT
Inorganic salts
SIPERNAT® 255
SIPERNAT® 50S
SIPERNAT® D17
AEROSIL® 200
Construction chemicals
SIPERNAT® 22S
SIPERNAT® 360
SIPERNAT® D17
AEROSIL® 200
AEROSIL® R 972
Fire extinguishing powder
SIPERNAT® D17
SIPERNAT® D10
AEROSIL® R 974
AEROSIL® R 812
Plastic additives
SIPERNAT® D17
SIPERNAT® 22S
AEROSIL® 200
AEROSIL® R 974
Plaster
SIPERNAT® 22S
SIPERNAT® D17
AEROSIL® R 972
SIPERNAT® 50S
Cellulose derivates
SIPERNAT® D17
SIPERNAT® 50S
SIPERNAT® 22S
AEROSIL® R 972
More products by Evonik for technical powders