Food-grade aluminum foil specifically refers to 8011 aluminum foil, which is considered a food-grade, safe and sanitary material. 

8011 is an 8 series aluminum alloy. Its main component is aluminum, and it also contains a certain proportion of silicon (Si) and iron (Fe), as well as other trace elements. 

This kind of aluminum foil is commonly used when baking or grilling because it has several advantages:

it can prevent food from sticking to the baking sheet and facilitates cleaning of the baking sheet; 

it can prevent the seasoning from falling when baking food with seasoning; 

it can prevent moisture loss , keep the food fresh and tender; covering bread or cakes with aluminum foil can prevent the surface from getting too dark; 

it can make the food heat evenly and prevent it from burning.