Thickness of aluminum foil various, classified based on their intended applications. Here's a classification of aluminum foil thickness by common applications:

1. Household Applications:
   - Standard household foil: Typically ranges from 0.01 to 0.018 millimeters (10 to 18 micrometers) in thickness. Used for general purposes like food wrapping, cooking, baking, and insulation.

2. Food Packaging:
   - Lightweight food packaging foil: Usually around 0.006 to 0.01 millimeters (6 to 10 micrometers) thick. Used for packaging individual food items, portioning, and single-use purposes.
   - Medium-weight food packaging foil: Typically around 0.011 to 0.02 millimeters (11 to 20 micrometers) thick. Used for wrapping larger food items and providing better protection during storage and transportation.
   - Heavy-duty food packaging foil: Ranging from 0.02 to 0.03 millimeters (20 to 30 micrometers) in thickness. Designed for heavy-duty applications like catering, roasting, and grilling.

3. Industrial Applications:
   - Industrial-grade foil: Varies widely in thickness, typically ranging from 0.006 to 0.2 millimeters (6 to 200 micrometers). Used in various industries for applications such as insulation, packaging, electronics, and manufacturing processes.

4. Medical and Pharmaceutical Applications:
   - Medical-grade foil: Generally falls within the range of 0.02 to 0.1 millimeters (20 to 100 micrometers) in thickness. Used for sterile packaging, medical devices, and pharmaceutical applications.