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When applied in food powder, fumed silica is added as anti-caking agent and free flow aid. Due to change in temperature, humidity and pressure during storage and transport period, powder is easy to cake, which has bad effect on quality and shelf life of end product.
Fumed silica is with small particle size, large surface area and porous structure, those properties ensures good adsorption ability and great hygroscopicity. In food powder, fumed silica covers all around the powder, it can separate particles, so to decrease viscosity and to ensure excellent flowing property. And, numerous internal pores of fumed silica can adsorb the humidity around food product, it avoids agglomeration when stored.