The body of Thermos® product is made of SUS304 stainless steel, all Thermos® food grade containers are comply with all recognised safety standard. Thermos® vacuumware are tested by independent labs to ensure that our material and processes are safe. Stainless steel and plastic parts in the Thermos® vacuumware do not contain any heavy metal or plasticizer which is harmful to human body. Please purchase and use at ease.