The insulation principle of a thermos mainly relies on its vacuum structure and stainless steel inner liner, which work together to reduce heat transfer and ensure excellent insulation effect. However, although this stainless steel liner is resistant to high temperatures and not easily deformed, it is extremely sensitive to strong acid environments. Lemon juice, sour plum soup and other acidic beverages contain a large amount of acidic components, which may corrode the stainless steel inner liner and damage the insulation performance of the thermos cup.
1. Acidic beverages
Acidic beverages such as lemon juice may corrode the stainless steel liner, affecting insulation performance and endangering health. However, although honey is weakly acidic, if honey water is stored in a thermos, the metal in its inner container may react with honey. Long term consumption of such honey water may cause discomfort such as diarrhea, nausea, and vomiting. Therefore, it is recommended to avoid storing acidic beverages in insulated cups for a long time to ensure safe and healthy consumption.
2. Carbonated beverages
Carbonated beverages are prone to corrode stainless steel, and prolonged contact with stainless steel may cause corrosion, leading to the release of toxic and harmful substances, posing a threat to health. In addition, due to the frequent carrying and inevitable shaking of thermos cups, the gas in carbonated beverages can escape, causing the pressure inside the bottle to rise, which can lead to problems such as difficulty in opening the bottle stopper or the beverage spraying out when the lid is opened.
3. Milk and dairy products
Milk is prone to bacterial growth in thermos cups, posing health risks if consumed beyond the designated time. Heating can damage nutrition. Drinking milk with excessive levels of these bacteria carries a risk of causing health problems such as diarrhea and abdominal pain. In addition, the vitamins and other nutrients in milk heated at high temperatures may be destroyed, and the acidic components in milk may also undergo chemical reactions with the inner lining of the thermos. Long term consumption of such milk is harmful to health.
4. Tea
If tea leaves are soaked in a thermos for a long time, it can cause varying degrees of damage to many nutrients in the tea, such as vitamin C, flavonols, tannic acid, and theophylline, significantly reducing their nutritional value. Brewing tea in a thermos cup can easily lead to nutrient loss and heavy metal release, affecting health. In addition, soaking tea leaves for a long time may release heavy metal substances, posing a threat to health. Meanwhile, the inner wall of the thermos may also undergo color changes due to long-term exposure to tea soup.
5. Salted beveragesDue to the sandblasting and electrolytic treatment of the inner liner of the thermos, it is designed to ensure drinking water safety, but salt containing beverages such as saltwater are not suitable for long-term storage in it. Saltwater is highly corrosive, similar to acidic substances, and can damage stainless steel inner tanks, thereby affecting the quality of drinking water.
