Release base papers are paper or plastic-based film sheets that prevent sticky surfaces from adhering too soon. They are usually applied during the manufacturing process.Some types of release base papers:

Clay coated kraft (CCK): This paper is less reactive to moisture and temperature than other papers, which gives it good dimensional stability. It’s also the most common material used for labels.

Super calendered kraft (SCK): This paper is very smooth.
Glassine: This paper is very smooth.

Other types of release base papers include:
Silicone coated release liner paper
Butter paper
Polyester film
Waterproof paper
Self adhesive paper