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Cosmetic vacuum bottles are highly favored for their excellent shelf life extension capabilities and effective protection against oxidation and contamination. However, the performance of vacuum bottles depends largely on the characteristics of the selected materials, so special care should be taken in material selection.
Chemical stability
The formula of cosmetics is usually composed of a variety of active ingredients, such as plant extracts, vitamins and preservatives. The sensitivity of these ingredients to the external environment makes the chemical stability of vacuum bottle materials particularly important. Selecting materials that are compatible with cosmetic ingredients can effectively prevent potential chemical reactions. For example, some plastics (such as polystyrene) may react with oily ingredients, resulting in product deterioration. Therefore, materials with excellent chemical stability such as polypropylene (PP) or polycarbonate (PC) are more suitable. In addition, the material of the vacuum bottle must also have anti-corrosion properties to ensure that it does not react with cosmetic ingredients during storage. Choosing acid and alkali resistant materials will significantly extend the effective service life of the product in the bottle.
Physical properties
The physical properties of vacuum bottles directly affect its convenience and safety of use, mainly including pressure resistance, temperature resistance and barrier properties. Pressure resistance refers to the pressure changes that the vacuum bottle can withstand during use, especially in extreme temperature environments. Choosing high-strength materials (such as reinforced glass or high-strength plastic) can ensure that the bottle body is not easy to break or deform when experiencing pressure changes.
Temperature resistance is also a key indicator. The storage temperature of cosmetics is usually between 0°C and 40°C. The temperature resistance of the material will directly affect the performance of the vacuum bottle. Materials such as polycarbonate and borosilicate glass show good stability in high temperature environments and can effectively maintain their physical properties. In addition, the material of the vacuum bottle should have excellent barrier properties to prevent the penetration of oxygen, moisture and light. Generally speaking, glass materials perform well in barrier properties, while some plastic materials need to add special ingredients to improve their barrier properties.
