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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

AEROSIL® for Technical powders

File

Language

SIPERNAT® and AEROSIL® in Technical Powders (pdf, 328,47 KB)

The products of Evonik Industries have earned a solid reputation as valuable materials for the plastics and rubber industry. This flyer provides an overview of the advantages and possibilities of AEROSIL® fumed silica as well as SIPERNAT® specialty silica as a flow and anti-caking agent or carrier.

EN

Technical Information 1213: Specialty silica as flow aid, anticaking agent and carrier substance (pdf, 623,95 KB)

Recommended mixing procedures for powders and granulates Specialty Silica have found their way with numerous applications into many branches of industry. This also applies to their use as carrier for liquid or pasty substances as well as the application as flow aid for powdered or granular products. Due to their fineness and low bulk density mixing with other ingredients is somehow sophisticated. This Technical Information gives some recommendation on suitable mixing equipment and how to use it, when Specialty Silica are concerned.

EN

Technical Information 1360: SIPERNAT® and AEROSIL® - an Essential in Industrial Powder Technology (pdf, 245,25 KB)

Performance Silica have found their way with numerous applications into many branches of industry. This also applies to their use as carrier for liquid or pasty substances as well as the application as flow aid for powdered or granular products. With numerous hydrophilic and hydrophobic AEROSIL® Fumed Silica as well as Sipernat® Precipitated Silica, Evonik offers the best choice of problem solvers worldwide.

EN

Technical Information 1413: SIPERNAT® specialty silica and AEROSIL® fumed silica for fire extinguishing powders (pdf, 186,41 KB)

SIPERNAT® specialty silica and AEROSIL® fumed silica help to keep powder fire extinguishers ready for action.

EN

More products by Evonik for technical powders