What kind of material is good for food grade glass bottles?
The quality of glass bottles can be used as a basis for national standards. A large proportion of glass bottles are used to hold foods and beverages. In addition to the general indicators such as appearance quality, the requirements for such glass bottles are more importantly the thermal and chemical stability of the products. Because glass bottles are sterilized at high temperatures before filling, high thermal stability is emphasized for these products. Containing pickles, fermented bean curd and other products, in order to preserve the quality, glass bottles are required to have a reliable chemical stability.
Various materials used for preparing glass batch materials are collectively referred to as glass raw materials. It consists of 7-12 species, 4-6 kinds of main materials, such as quartz sand, limestone, feldspar, soda ash, boric acid, lead compounds, barium compounds, etc., which can be divided according to the role of the introduced oxide in the glass structure. The raw materials for forming oxides of glass, raw materials of intermediate oxides, and network external oxides can be classified into raw materials of acidic oxides and raw materials of alkali metal oxides according to the properties of the introduced oxides.
Batching is the raw material for the glass to obtain some necessary properties and accelerate the melting process. Although the amount is small, the effect is very important. The auxiliary materials are classified into clarifiers, fluxes, colorants, bleaching agents, opacifiers, and oxidizers. , reducing agent and so on.
Different formulations of the same raw materials, different origins of the same raw materials, and different related index content will affect product quality and production costs. In the case where the raw material costs are not significantly different, the produced glass bottles can hardly be markedly different when compared with small samples. Only when batch production is performed can the differences be seen.