Paper cups are made with a plastic coating(Polyethylene- PE) inside them to get the liquid resistant properties. This coating is not environmental-friendly.
Let us take United Kingdom as an example. The UK alone uses 2.5 billion paper cups a year and less than 1% of the volume is recycled. PE needs special industrial plants to be recycled which aren’t that common(Only 3 factories in the Whole UK).
With the war against single-use plastics, The world needs a reliable and certified eco-friendly solution to replace these PE-lined paper cups.