Nowadays, glass bottles cannot be replaced by any material in all kinds of food packaging, especially pickles and edible oil. Everyone knows that high-end pickle bottles must be vacuum packed if they want a good taste and a long shelf life. Extending the shelf life of food additives is harmful to the human body. The only thing that does not affect the taste and is harmless to the human body requires vacuum packaging. The important factor of vacuum packaging is high temperature cooling to achieve the vacuum effect, and high temperature cooling of plastic bottles cannot achieve vacuum, because plastic bottles Thermal expansion and contraction, the bottle will be deformed after high temperature, and a large amount of plasticizer will also be volatilized, so the human body is not edible at all. This high-temperature vacuum method can only be completed with glass bottles or iron products, because iron products cannot achieve the transparent effect. And the price is relatively expensive, so there is no manufacturer in the market to use iron products to hold pickles. There are so many screenings, and the only package is glass bottles. First: the high temperature of the glass bottle will not produce harmful substances, and the second: the high temperature of the glass bottle will not produce harmful substances. It is deformed, so the pickles we see in the supermarket are basically glass bottles.