All About Baking - (Round Pre - Cut Greaseproof Paper 6" inches)

Greaseproof paper is exactly that - grease proof.

This is because it contains wax which creates a barrier for oily and fatty foods.

Hence it is quite suitable to wrap fatty foods such as cheese, sandwiches, etc.

However, because of the wax content, it is not suitable to use with heat.

Note: It is sometimes referred as wax paper.