Harmless.
316 stainless steel is made of 304 stainless steel based on the addition of 2% molybdenum (Mo element), which is a food-grade supplies, mainly for medical equipment, but also can be used in one or two types of tableware, which itself does not contain toxic substances, used in the production of insulation cups are non-toxic, but also has a better corrosion resistance, the general use of the correct harmless to the human body, but the cost is slightly higher.
But do not rule out some unscrupulous merchants forged labels, with other harmful stainless steel material imitation 316 stainless steel production of insulation cups, it is recommended that consumers before purchasing the liner can be smelled whether there is an odor, touch the liner is smooth, etc. to determine the strengths and weaknesses of insulation cups, in addition to the purchase of such intimate contact with the body of the product, be sure to choose the regular stores, hypermarkets, and check the certificate of conformity of the product. The first thing you need to do is to check the certificate of conformity of the product, and the instruction manual.
2 Thermos 316l stainless steel is food gradeYes.
Most of the existing 316l stainless steel on the market is produced in accordance with U.S. standards, in fact, it is based on the 304 upgrade, such as controlling the proportion of impurities and the addition of molybdenum, so that the corrosion resistance is stronger, and can withstand a variety of strong acids and alkalis, in addition to 316 stainless steel is also better adapted to the environment, the temperature is too high or too low, will not affect 316 stainless steel, corrosion resistance, so the cost is also a good idea. Corrosion resistance, so the cost is slightly higher.
3 Thermos 304 and 316 stainless steel which is more suitable for food gradeare suitable.
Stainless steel insulation cup 304 and 316 are food-grade, can be used with confidence, if only in the thermal insulation and food safety performance comparison, the two are not much difference, for the daily thermal insulation effect is better, and do not have to worry about the phenomenon of leakage of hazardous substances in the metal, and the corrosion resistance of 304 has been very strong, is the national standard recognized as food-grade metal, normal contact with water, tea, coffee, Milk, oil and salt, etc. is no problem at all, after all, buy a thermos cup will drink a cup of water, not to do what chemical experiments, will not go to use it to hold strong acids and alkalis, compared to 316 stainless steel thermos cups its cost-effective with some high.
4 316 stainless steel insulation cup can make teaCan, but do not recommend.
Even if 316 is recognized as food-grade stainless steel, can be used for tea, but the characteristics of the insulated cup decided that it is not suitable for tea, the main reason and the temperature is too high, because tea for a long time in the high temperature of the steeping, the tea itself, not only the nutrients will be lost most of the tea, and tea contains tea polyphenols, tannins, and other substances will be a large number of leaching, so that the tea is heavy color, with a bitter and astringent taste! The tea is not suitable to use a thermos cup.