Some brands of tea bags are made from plastic although the majority of tea bags are made from paper or filter paper.
Most tea bags however do use at least some plastic as a sealant to seal the tea bag after the tea has been added to the tea bag.
Some brands of the tea bags use polypropylene plastic as the sealant.
A lot of tea brands have been making the move towards completely biodegradable tea bags, finding alternatives to plastic and plastic sealants.
A tea bag is a small, porous, sealed bag or packet, typically containing tea leaves, which is immersed in water to steep and make an infusion.
Originally used only for tea, they are now made with other tisanes as well.
Tea bags are commonly made of filter paper or food-grade plastic, or occasionally of silk cotton or silk.
The tea bag performs the same function as a tea infuser.
Tea bags can be used multiple times until there is no extraction left.
Some tea bags have an attached piece of string with a paper label at the top that assists in removing the bag, while also displaying the brand or variety of tea.