How does the material selection of cosmetic vacuum bottle affect the shelf life of the product

In the cosmetics industry, the shelf life of products is crucial to consumers' experience and brand reputation. As an important packaging form for cosmetics, the selected materials of vacuum bottles have a significant impact on the shelf life of products.
Chemical stability of materials
Cosmetics usually contain a variety of active ingredients, such as plant extracts, vitamins, antioxidants and preservatives. These ingredients place high demands on the chemical stability of packaging materials.
Plastic materials: Common plastics such as polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET) have good chemical stability. However, low-quality plastics may react with cosmetic ingredients, causing product deterioration. For example, polyvinyl chloride (PVC) may release harmful substances under certain conditions, affecting product quality. Therefore, choosing high-quality plastic materials is the key to ensuring the shelf life of products.
Glass materials: Glass is an extremely stable material that hardly reacts with most cosmetic ingredients. It can effectively maintain the purity of the product and avoid degradation and deterioration of ingredients. Therefore, many high-end cosmetics tend to use glass bottles to ensure the long-term stability and effectiveness of their products.
Metal materials: Metal bottles (such as aluminum bottles) usually have good sealing and corrosion resistance, but some metals may react with cosmetic ingredients. To avoid this, many metal bottles are coated internally to prevent chemical reactions. This treatment can effectively extend the shelf life of the product.

Material permeability and light transmittance
The permeability and light transmittance of vacuum bottle materials also have an important impact on the shelf life of the product.
Permeability: Vacuum bottles are designed to prevent air from entering, but the difference in permeability of different materials may lead to the penetration of oxygen and moisture. Plastic bottles have relatively high permeability, especially in high temperature or high humidity environments, which may accelerate product oxidation and shorten the shelf life. Glass bottles, on the other hand, usually have lower permeability and can effectively prevent oxidation and moisture intrusion, thereby extending the shelf life of the product.
Light transmittance: The effect of light on cosmetic ingredients cannot be ignored, especially light-sensitive ingredients such as vitamin C and certain plant extracts. Glass materials can effectively block ultraviolet rays by choosing different colors (such as amber or dark green), thereby protecting products from light. In contrast, plastic bottles have a higher light transmittance, which may cause the product to degrade under light and shorten the shelf life.

Temperature and humidity resistance of materials
Cosmetics may encounter different temperatures and humidity during storage and transportation, which also has an important impact on the shelf life of the product.
Temperature resistance: Differences in temperature resistance of different materials may lead to differences in the stability of products in high temperature environments. Plastic materials may deform or release harmful substances at high temperatures, affecting product quality. Glass and metal materials usually have higher temperature resistance and can maintain their performance at higher temperatures.
Humidity resistance: The impact of humidity on cosmetics is mainly reflected in the growth of microorganisms and the degradation of ingredients. Plastic bottles may absorb moisture in high humidity environments, causing product deterioration. Glass and metal bottles usually have better humidity resistance, which helps maintain product stability.