Cooling fans used in microwaves to cool the magnetron are typically made of engineering plastics that possess good heat resistance and electrical insulation properties. The specific type of plastic used can vary depending on the manufacturer and model of the microwave, as well as other design considerations. Common plastics used for such applications include:
Polyphenylene Oxide (PPO): PPO is a high-performance plastic known for its excellent dimensional stability and resistance to heat and chemicals. It is often used in electrical and electronic applications due to its electrical insulation properties.
Polyamide (PA): Polyamides, commonly known as nylon, are widely used in various applications. They offer good mechanical strength, heat resistance, and electrical insulation properties, making them suitable for cooling fan components.
Polybutylene Terephthalate (PBT): PBT is a thermoplastic polyester that exhibits good mechanical properties, heat resistance, and electrical insulation. It is often used in electrical and electronic components due to its excellent dimensional stability.
Polycarbonate (PC): Polycarbonate is a popular choice for applications requiring transparency, impact resistance, and good thermal properties. While not as heat-resistant as some other plastics on this list, it can still be used in certain microwave cooling fan components.
It's important to note that the specific plastic used in a microwave's cooling fan can vary between different manufacturers and models. Therefore, it's always best to consult the manufacturer's documentation or contact customer support for accurate information about a particular microwave's construction and materials.