Professional Analysis Is the Stainless Steel Kettle Poisonous?
In the past two days, the circle of friends has been properly screened by the “poison bottle”, but “explosiveness” is not “authenticity”. As the most professional third-party media in the stainless steel industry, it is necessary for us to discuss the authenticity of the “poison bottle” incident Investigate and restore the truth of the incident.
Three main points of view in the “Poison Kettle” incident:
1.55% of electric kettles are made of cheap high manganese steel, should be made of food grade 304 stainless steel
2. Long-term use of high manganese steel, heavy metals such as “manganese” will precipitate
3. Long-term excessive intake of manganese will affect the function of the nervous system, causing symptoms such as memory loss, lethargy, malaise, and neurological disorders.
The editor used the spirit of breaking the casserole to the end and consulted many industry experts and senior industry seniors on the above viewpoints one by one.
Both 304 and 201 contain manganese!
In fact, stainless steel has added trace elements in order to achieve the effects of anti-corrosion and improve material properties.
High-manganese steel is 201 stainless steel on the market. 201 has such a legend: 201 is a nickel-saving stainless steel product developed to relieve the pressure of nickel during World War II. It contains 3.5-5.5% nickel and 5.5-7.5% manganese. It is through the use of manganese to replace part of “nickel” to form austenitic phase to form austenitic stainless steel. So the original intention of 201 is good. . . . Please don’t blame 201.
304 is food grade stainless steel, but 304 also contains manganese. 304 contains 8% nickel and 2% manganese. It’s just that 304 has a lower manganese content than 201.
Is manganese really that terrible?
Manganese is one of the essential elements of the human body. It is ubiquitously present in air, water, land, and food. People take in manganese from various sources every day.
It is currently considered that 10 mg per day is the human body’s maximum tolerable dose. According to the results of China’s Fourth National Nutrition Survey, the average daily dietary intake of manganese by Chinese residents is about 6.8 mg. China also stipulates that the manganese content in drinking water is 0.1 mg/liter. If you drink two liters of water a day, the manganese intake from the water is 0.2 mg.
What happens even if we are drinking the “poison bottle”?
The National Food Safety Risk Assessment Center initially investigated and tested nearly 40 stainless steel samples. The results showed that the average migration of manganese in stainless steel products was 0.35 mg per kilogram (two liters of water) of food.
Then, eating and drinking water, and it is a “poison bottle” water, “five poisons are complete”, you can get an adult’s daily manganese exposure is about 7.35 mg. “It is far from reaching the maximum tolerable dose of 10 mg per day.”
Leave the dose to talk about toxicity, play a hooligan!
Although it has not reached maximum tolerance, will it become semi-silly after drinking the water from the “poisoned kettle”?
Oh my god! ! !
The academician of the Chinese Academy of Engineering explained that the maximum tolerable dose refers to the safe intake value. If it is within the maximum tolerated dose, there will be no problem even if it is eaten every day and for a lifetime. After the maximum tolerated dose is exceeded, long-term intake will cause poisoning. The risk of increased, but it does not mean that poisoning will occur as soon as it exceeds.
So the result? Is it important?
The result here is that even low-end stainless steel products do not need to worry about health problems caused by excessive manganese. The 201 kettle problem is not enough to cause social panic.
But, note that there is a but. Why does the EU not allow the import of tableware made of 201 materials? Generally, products exported to the United States and Europe must have food hygiene certification. At present, the more authoritative certifications include ROHS and LFGB reports. 201 stainless steel materials cannot pass this test. In China, the new national standard “National Food Safety Standard Stainless Steel Products (GB9684-2011)” does not provide for the migration limit of manganese. Therefore, according to the national standard, the application of 201 stainless steel in daily necessities does not violate the regulations.
The difference between Chinese standards and international standards will result in double standards in the stainless steel food manufacturing industry.
Therefore, if it is said that it is necessary to prevent minor failures, or prevent problems before they occur, of course, food-grade stainless steel is better. Our 51bxg also put forward the following suggestions here:
It is difficult to distinguish between 201 stainless steel and 304 stainless steel by daily methods, so we recommend that you pay attention to the material label on the bottom of the product when choosing stainless steel products, and choose products made of stainless steel marked “304” or “0Cr18Ni9”.