I heard that MDI is toxic, is it true?

It is very responsible to tell you that MDI will not be toxic, because the MDI produced by Wanhua Institute of Chemical Technology is used in a large number of fields that have very close contact with people's livelihood and medical treatment, including Lycra fibers for garments, refrigerator liner materials, and even implantation of artificial organs in human body, such as artificial blood vessels and heart valves, etc. So it can't be toxic. So it can't be toxic, don't be alarmist.