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50 Core Q&As and Popular Science on Food-Grade Silica Gel
It is prepared through specific purification processes, featuring stable chemical properties and excellent adsorption performance. As a legal additive, it is widely used in the food industry, with the international code E551.
I. Basic Cognition Chapter
1.What is food-grade silica gel?
Food-grade silica gel (commonly known as food-grade silica) is an amorphous white powdery inorganic compound with the chemical formula SiO₂. It is prepared through specific purification processes, featuring stable chemical properties and excellent adsorption performance. As a legal additive, it is widely used in the food industry, with the international code E551.
2.What are the core differences between food-grade silica gel and industrial-grade silica gel?
The core differences lie in purity, safety, and application: Food-grade silica gel must meet strict food additive standards (e.g., lead content ≤ 3mg/kg), only contains an amorphous structure, and has no carcinogenic risks; industrial-grade silica gel may contain crystalline silica (such as quartz) and harmful impurities, mainly used in construction, chemical engineering, and other fields, and is strictly prohibited for use in food.
3.Does food-grade silica gel exist in nature?
Yes, it does. It widely exists in the Earth's crust, such as quartz sand and diatomite. However, natural silica needs to undergo purification, impurity removal, and other processes to meet food-grade purity standards before it can be used in the food industry.
4.What are the key physical properties of food-grade silica gel?
Its main properties include: insoluble in water and most acids (only soluble in hydrofluoric acid and strong alkalis), rich in microporous structures inside, large specific surface area, strong adsorption capacity, and the ability to form an isolation film on the surface of powder particles, with both moisture-proof, anti-caking, and stabilizing functions.
5.Is there a difference between colloidal silica gel and ordinary food-grade silica gel?
Colloidal silica gel (prepared by the vapor-phase method) is a high-end category of food-grade silica gel. It has finer particles (nano-scale) and higher purity. In addition to anti-caking, it can also be used as a thickener to improve food texture, and is widely used in dairy products and health products.......
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