Silica from Evonik improves the storage stability of powders
Even after storage and transportation, powders needs to remain pourable without caking. SIPERNAT® specialty silica and AEROSIL® fumed silica ensure good storage time stability and prevent caking. This is known as an anticaking effect and is closely linked to the free flow effect .
Adding AEROSIL® fumed silica makes spice powders storable and easier to dose. Evonik offers AEROSIL® fumed silica types that meet the particular hygiene requirements of the food industry. HACCP certification can be provided if needed.
Adding SIPERNAT® specialty silica protects food emulsifiers against caking. (Left: with SIPERNAT® specialty silica; right: without SIPERNAT® specialty silica.)
Adding SIPERNAT® specialty silica makes animal feeds easily pourable even after transportation and storage.
Adding SIPERNAT® specialty silica prevents plastic granulates from caking, so that they pour finely from the bottle (right: caked granulates without SIPERNAT® specialty silica).
SIPERNAT® specialty silica ensures that milk powder remains pourable and prevents caking.
A powder’s pourability is crucial to how easily it can be dosed and used (free flow effect). This product property must be guaranteed at all times, even when the powder has been stored for a long time or transported to the customer, for example. Evonik offers a broad portfolio of SIPERNAT® specialty silica and AEROSIL® fumed silica for this purpose. They are highly effective even in small quantities. Even in substances that cake very easily, such as waxes and thermoplastic polymers, the storability is significantly enhanced.
Soft, malleable powder particles can become deformed during storage and cake. Hygroscopic powders absorb moisture and release it again, causing recrystallization.
SIPERNAT® specialty silica and AEROSIL® fumed silica products consist of fine silica agglomerates that envelop the particles of the powder to be treated (known as the host powder) and cause an anticaking effect. The powder particles are prevented from growing together.
To ensure that the effect lasts for as long as needed, slightly higher quantities of SIPERNAT® specialty silica and AEROSIL® fumed silica are needed for the anticaking effect than for a simple free flow effect.
Fine-particle SIPERNAT® specialty silica and AEROSIL® fumed silica products can be incorporated into the host powder simply by mixing. Suitable mixers include plowshare mixers, paddle mixers, and belt mixers.
For malleable, easily deformable powders or granulates, it is particularly important to ensure gentle mixing, so that the silica is not pressed into the surface of the powder particles.
You can find more detailed information on this topic in our Technical Information Sheets TI 1213, TI 1351 TI 1360 and TI 1365.