It is not recommended to microwave a bottle that has an aluminum coating on it. Microwaving metal, including aluminum, can be dangerous and cause potential hazards.
When microwaving metal, the electromagnetic waves in the microwave interact with the metal, causing electric currents to flow. This can lead to a buildup of electrical energy and result in sparking or even fire. Microwaving metal can damage the microwave and the container, and it may also create a safety risk.
Regarding the leaching of chemicals, the presence of an aluminum coating on a bottle does not necessarily prevent leaching when microwaving. Microwaving can cause a temperature increase in the container and its contents, which may accelerate chemical leaching processes.
If you need to heat a liquid or food in a bottle, it's best to transfer the contents to a microwave-safe container before heating. Use containers made of materials specifically labeled as microwave-safe, such as glass, ceramic, or microwave-safe plastics. Always follow the manufacturer's instructions for the containers you use.
For short periods of microwaving, especially under two minutes, the risk of leaching is generally low when using microwave-safe containers. However, it's essential to use appropriate materials to ensure the safety of the food or drink and to avoid any potential chemical leaching or other hazards.