Vapes, or electronic cigarettes, typically use a type of plastic called polycarbonate to make their tanks or cartridges. Polycarbonate is a clear, durable, and heat-resistant plastic that is often used in food and beverage containers, medical devices, and electronic components. It is known for its ability to withstand high temperatures, making it a suitable material for vaping devices that produce heat to vaporize the e-liquid. However, it's important to note that the safety of vaping and the materials used in vaping devices is still a topic of research and debate among experts.