The housing is made of PP, which is relatively harmless to health and the environment. The heating element is made of SUS304.
The article is not made of BPA.

PP: This hydrophobic semi-crystalline polymer has several advantages that make it a material of choice in retail and industry:
inert to acids and alkalis ;
highly resistant to deformation and tearing
adaptable to very high temperatures
inexpensive;
odourless, inert and non-toxic
sterilisable;
recyclable (on a case by case basis);
insulating (used in electricity).