Not all materials are safe to be used in a microwave. 

Microwave- safe kitchenware include:

- Heat-resistant glassware

- Heat-resistant ceramics

- Microwave safe plastic

- Paper plates and cups

Do not put the following materials and items in the microwave:

- Aluminum foil

- Plastic food containers (like margarine or yogurt tubs)

- Single-use plastic containers

- Dishes with metallic paint or trim

- Foam-insulated cups or bowls