Stone (or rock) paper is a type of strong, and durable paper-like product manufactured from calcium carbonate bonded with high-density polyethylene (HDPE). It is used for stationery, leaflets, posters, books, magazines, bags, packaging, wallpaper, adhesives, tags, in-mould labels, plates, trays, containers and many other uses. The process for creating stone paper was first developed by Taiwan Lung Meng Tech Co during the late 1990s.
Its has many advantages over traditional paper made from wood pulp. Stone paper collects no static charge, is acid-free with a neutral pH, has no grain, is water, is grease and insect resistant, and tears with difficulty due to a latex-like texture. Because it is not made from fibers, it possesses a smoother surface than most traditional paper products, obviating the need for a coating or lamination. The source of the calcium carbonate is waste material collected from marble quarries and offcuts which are ground and reduced to fine white calcium carbonate powder. The production of the paper uses no water, acid and no bleach or optical brighteners.
According to the EPA, HDPE is considered a Type 2 plastic, which is widely accepted at recycling centres, but not always.