Why are beer bottles made of glass instead of plastic?

Why are beer bottles made of glass instead of plastic?

Why are beer bottles made of glass instead of plastic? Maybe a lot of people will have such a question, most of the drink bottles are plastic, but most of the beer is glass bottles, of course, there are cans, but there is no plastic bottles. So what are the reasons?

1, glass bottles have the advantages of good gas resistance, long storage life, good transparency, easy recycling, beer is extremely sensitive to light and oxygen, and the shelf life is usually up to 120 days, the oxygen permeability of the beer bottle is not greater than 1×10-6g in 120 days, the loss of CO2 is not more than 5%, the requirement is 2~5 times of pure PET bottle permeability.

2. One of the most important ingredients in beer is hops, which give beer its special bitter taste. The ingredients in hops, however, are light sensitive and break down in the presence of ultraviolet rays from the sun, creating the unpleasant "sunsmell". Colored glass bottles can reduce this reaction to some extent. But brown bottles work better than green, and there are clear, colorless bottles on the market where hops are treated. Ordinary window glass, oil bottles, wine bottles and so on have a light green, which is the raw material of glass containing iron ions impurities brought by the green. Some medicine bottles, beer bottles and soy sauce bottles are brown and yellow, which is still caused by impurities in iron, but iron ions are not iron ions, but iron ions.

3, beer contains alcohol and other organic ingredients, and plastic bottles, plastic belongs to organic matter in these organisms harmful to human body, according to the principle of informative compatible these organisms will be dissolved in beer, when people drink the beer and the toxic organic matter intake of the body, so as to cause harm to human body, so no beer plastic bottles.

More than a few reasons, therefore, decided to the beer cannot use plastic bottles, some of the brewery beer by pasteurization, require resistance to peak temperature of 298 ℃, and the intensity of pure PET bottle, the heat resistance, gas barrier property were not meet the requirements of the beer bottle, as a result, people rushed to the research and development of various resistance, increase of new materials and new technology.