Aluminum foil is a thin, flexible sheet made primarily of aluminum metal. Thickness of aluminum foil vary due to cater to different applications and needs. 

• Thin aluminum foil: The thinnest aluminum foil available can have a thickness as low as 0.006 millimeters (6 micrometers). This ultra-thin foil is often used in delicate applications that require lightweight and flexible material, such as electronics, capacitors, and packaging for sensitive products.

• Standard household aluminum foil: The most commonly used aluminum foil in households has a thickness ranging from 0.01 to 0.018 millimeters (10 to 18 micrometers). This thickness is suitable for general-purpose tasks like food wrapping, cooking, baking, and insulation.

• Heavy-duty aluminum foil: Heavy-duty aluminum foil is thicker and more robust than standard household foil. It typically ranges from 0.02 to 0.03 millimeters (20 to 30 micrometers) in thickness. Heavy-duty foil is designed for more demanding applications, including grilling, barbecuing, and wrapping larger food items.

The thickness of aluminum foil can vary depending on specific product, and intended use.