Microwaves are indeed predominantly made of metal and plastic, which are non-flammable materials. However, it's essential to understand that the concern regarding the potential flammability of microwaves is not primarily related to the materials used in their construction.
The main safety concern with microwaves is related to the electrical components and circuits inside the microwave oven, which can generate heat and cause sparks if there is a malfunction or a short circuit. If a short circuit occurs, it could lead to electrical arcing, which may ignite flammable materials in or around the microwave, such as paper, cardboard, or certain types of plastics.
Moreover, while the exterior of most microwave ovens is made of non-flammable materials, there are certain components, such as vents and control panels, that may have plastic parts or other materials that could be flammable under certain circumstances.
To minimize the risk of a fire, it's essential to keep the area around the microwave free from any flammable materials. Additionally, it's crucial to follow the manufacturer's instructions, avoid using damaged microwaves, and have them serviced or repaired by qualified professionals if any issues arise.
As with any electrical appliance, it's essential to use microwaves with caution and ensure proper maintenance and safety practices to prevent potential hazards.