Is the stainless steel vacuum flask toxic?
1. The stainless steel vacuum flask is non-toxic with boiling water. The stainless steel thermos cup is made of double-layer stainless steel inside and outside. The inner tank and the outer shell are combined by welding technology, and then the air in the interlayer between the inner tank and the outer shell is extracted by vacuum technology to achieve the effect of vacuum insulation. It has many advantages such as good thermal insulation performance, light weight, anti-rupture, anti-corrosion, anti-extrusion, good heat resistance and rapid change performance, and easy to use. Moreover, the stainless steel vacuum flask is made of food-grade 304 stainless steel to ensure that the amount of heavy metals dissolved in the vacuum flask containing water does not exceed the standard, including lead.
The inner cover of the regular stainless steel thermos cup is made of PC material. This kind of PC material is tasteless and will not deform when boiled in boiling water. The rubber ring is made of silica gel, which is also non-toxic. Therefore, the stainless steel thermos cups purchased through regular channels for drinking boiled water are not toxic, and will not pose a hazard to people’s healthy drinking water. But be careful not to choose a stainless steel thermos that is too cheap, because the cost of 304 stainless steel determines the quality. Generally, the price of a genuine stainless steel vacuum flask ranges from 100 to 500.
2. The acid and alkaline substances in the stainless steel vacuum flask are harmful. Stainless steel vacuum flasks are alloy products. Improper use will release heavy metal substances contained in them, which are harmful to health. In daily use, it is not a problem to use a stainless steel thermos cup to hold ordinary boiling water, but do not use acidic drinks, such as juice, coffee, carbonated drinks, etc., because heavy metals are easily precipitated, so even if it is used to drink ordinary water, it is not safe. .
3. It is harmful to brew milk and other substances with stainless steel insulation. Using a stainless steel thermos to brew milk will cause bacteria to multiply every 20 minutes, and the milk will deteriorate after 3-4 hours. In addition, the constant temperature in the thermos cup can destroy the vitamins in the milk, etc., and also directly affect the physical and mental health.
Can the stainless steel thermos cup make tea?
It is not recommended to use the stainless steel thermos cup to make tea. The tea contains a lot of tannins, theophylline, aromatic Oil and multivitamins should only be brewed with water around 80 degrees. If you use a thermos cup to make tea, soak the tea leaves in high temperature and constant temperature water for a long time, just like boiling with warm fire. A large number of vitamins in tea are destroyed, aromatic oils are volatilized, and tannins and theophylline are leached in large quantities, which not only reduces the nutritional value of tea, but also makes tea juice without fragrance, tea tastes bitter, and harmful substances increase. If the tea is steeped for too long, the tea may also release heavy metals, which are harmful to health. Therefore, it is not recommended to use a stainless steel thermos to make tea.
Stainless steel is a general term for a class of alloy steels, which usually contain 10%-30% chromium and metallic nickel. According to its structure and chemical composition, it can be subdivided into ferritic steel, austenitic steel, martensitic steel, dual-phase steel and precipitation hardening steel, etc.
The corrosion resistance of stainless steel mainly depends on the content of chromium element. When the content of chromium in stainless steel reaches 12%, in the atmospheric environment or oxidizing environment, chromium can spontaneously form a thin passivation film to prevent further oxidation and corrosion, so it generally does not rust in daily use. However, corrosion may still occur when encountering substances such as acids, alkalis, and salts (the effect of alkaline substances on stainless steel is relatively weak) or when the passive film is destroyed.
Stainless steel cups manufactured according to national standards, in order to protect human health, there are strict standards for chromium migration, which should not exceed 0.4 mg/square decimeter. Tea water is only very weakly acidic, and it is much less corrosive to stainless steel thermos. Therefore, as long as the stainless steel cup you use is a product that meets the national standard, don’t leave a cup of tea for too long, and you don’t have to worry about the migrated chromium element exceeding the standard.
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