The most common spunbonded nonwoven fabric, which uses PP polypropylene, is an FDA approved plastic that can be contacted with food and heated. The composition of the nonwoven is very complicated.
There are many grades of non-woven fabrics, and there is currently no food grade measurement by non-woven fabric manufacturers. Whether it meets food safety certification and export requirements, it is recommended to seriously consider it.
I still recommend cotton gauze.
