This submission claims that "traditional banknotes which are based on special and expensive paper suffer from poor tear properties and they have limited life", and touts tallow-dependent plastics as a solution. US currency is made of a cotton-linen blend, so (pedantically) it is not paper. Per US Currency Education Program [1], "it would take 4000 double folds, forwards and backwards, to tear a banknote". Is this ins…
Perhaps it isn't paper in the US but rag paper is quite definitely paper in the UK.