Don't buy insulation cups indiscriminately! Be careful not to step on thunder at these points

Beginning of winter season
The temperature drops faster and the temperature difference between day and night increases
Insulating cups have become a hot topic in many families recently
Essential supplies
Choosing a thermos cup is a choice
Appearance or quality
How to buy one
What about the cup that is both safe and insulated?
Today, the editor will tell you something
Little knowledge about insulated cups
Insulating cup, just having beauty is not enough
Appearance is the basic 'responsibility' of a thermos cup, but when we hold it in the palm of our hand and drink water, we realize that material is more important than appearance.
Most insulation cups are made of stainless steel, which is resistant to high temperatures and has good insulation performance. Other materials such as glass and ceramics are not easily favored by people during seasons with significant temperature changes due to factors such as insulation and anti drop.
Stainless steel materials are usually divided into three types, with "codes" being 201, 304, and 316.
201 stainless steel, best at camouflage
Most of the unqualified insulation cups we see in the news use 201 stainless steel as the inner liner of the insulation cup. 201 stainless steel has a high manganese content and poor corrosion resistance. If it is used as the inner liner of the insulation cup, long-term storage of acidic substances may lead to the precipitation of manganese elements. Manganese metal is an essential trace element in the human body, but excessive intake of manganese can harm the body, especially the nervous system. Imagine if children were to drink this water all day, the consequences would be really serious!
304 stainless steel, the most commonly used stainless steel
The main safety hazard of stainless steel in contact with food is the migration of heavy metals. Therefore, the stainless steel material in contact with food must be food grade. The most commonly used food grade stainless steel is 304 stainless steel with good corrosion resistance. To be named 304, it itself needs to contain 18% chromium and 8% nickel to be considered legitimate.
However, merchants will label stainless steel products with the word 304 in a prominent position, but labeling 304 does not mean that it meets the requirements for food contact use. 304 stainless steel is relatively acid resistant, but it is still prone to pitting corrosion when encountering substances containing chloride ions, such as salt solutions.
316 stainless steel, more advanced version
Compared to 304 stainless steel, it is prone to pitting corrosion when encountering substances containing chloride ions. 316 stainless steel is an advanced version: it adds metal molybdenum on top of 304 stainless steel, allowing for better corrosion resistance and greater "resistance". Unfortunately, 316 stainless steel has a high cost and is mostly used in medical, chemical and other high-end fields.