It won’t have the hazardous substance when using the paper lunch box to carry foods. But the paper box is not strong enough and it is easy to be broken even easy to cause bacterial contamination because it is not seal.
In contrast to the paper box, the material of stainless steel tableware is relatively dense, generally it do not appear the situation that is not strong enough so that bring biological contamination to the meal, or because the seal is not tight to bring the risk of bacteria like the paper lunch box. There is a risk of transferring harmful substances by using plastic food containers with molecular polymerization. And the plastic waste will cause pollution to the environment.
Nowadays, glass lunch boxes are also popular around the world, but they are too heavy to carry and fragile.
So it is recommended that taking food with the stainless steel lunch box in daily life, take food as far as possible with cold, reheating before eating. But heating temperature neither too high nor too low, generally in the center of the temperature of 70 degrees Celsius to 75 degrees Celsius is appropriate. This will be better to kill the microbes and bacteria in the food, while also ensuring that no harmful substances are produced in the process of heating at high temperatures.
The housewares stainless steel is divided into three grades of 430 (13-0), 304 (18-8) and 316 (18-10). The number in front of the code represents the chromium content, and the latter number represents the nickel content. 430 stainless steel cannot resist oxidation caused by chemicals in the air. After a period of infrequent use, it will still be oxidized (rusted) due to unnatural factors. 304 stainless steel can resist chemical oxidation and is a material that must be used in national pressure cooker standards. 316 stainless steel is also known as “medical stainless steel”. High-end products are made of 10% nickel to make it more durable and corrosion-resistant, and there is no metal ion precipitation. The above is non-toxic, or food-grade stainless steel that meets the standards.
Now there are many 200 series (201 and 202) stainless steel lunch box on the market. Since the content of nickel in 200series is low, other elements must be supplemented, so phosphorus and manganese are added. These two elements are serious precipitation elements. These products are toxic. Among them, 201 belongs to moderate precipitation and 202 belongs to mild precipitation. The price gap is also very large, the price of the 200 series is much lower than the 300 series. And some small brands use the price difference to earn the profit of the first transaction. They use 201 stainless steel but say that they use 304 food grade stainless steel, so it is important to distinguish the material.
For example, for a stainless steel lunch box, it is recommended to ask the suppliers to show their copy of the LFGB certificate before purchasing. If there is an LFGB certificate on daily necessities that come in contact with food, it means that the product has passed testing and conforms to many German and European standards and meets German LFGB regulations. It is certified free of toxic substances that are harmful to health and can be sold in Germany, other European and American markets. In the European market, products with the LFGB certificate can strengthen customers’ confidence in them and their desire to buy. They are powerful market tools and greatly increase the competitiveness of the products in the market.