Stone paper, also known as limestone paper, rock paper, generically referred to as bio-plastic paper, mineral paper or rich mineral paper, is a type of strong and durable paper-like material manufactured from calcium carbonate bonded with small amount of resin 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 maps among other uses.
Stone paper has a density range of 1.0-1.6g/cm3, which is equal to, or slightly higher than, ordinary paper and a texture somewhat like that of the outer membrane of a boiled egg. It may be recycled with Number 2 plastics or remade into rich mineral paper again, and is not biodegradable but is photo-degradable under suitable conditions. It is suited for applications such as stationery, bags, packaging, adhesives, greaseproof paper, wrappers, containers and many other applications.
Stone paper has a number of advantages over traditional paper made from wood pulp. Stone paper is acid-free with a neutral pH; has no grain; is water, grease, and insect resistant; and tears with difficulty due to a latex-like texture.
Because it is not made from wood fibers, stone paper possesses a smoother surface than most traditional paper products, eliminating 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 stone paper uses no water, acid, bleach or optical brighteners. It can be recycled endlessly, but only if recycled separately at civic amenity sites.
Stone paper is a composite of calcium carbonate from strip mines and quarries, combined with a non-toxic resin.
- Chu and Nel, "Characterisation and deterioration of stone papers", AICCM Bulletin, vol 40.1, 2019
- "Stone Paper, Not as Recyclable as You Might Think", Waimakariri District Council, 2018
- Palladino, "This Paper Is Made From minerals, But It Isn't Exactly Eco-Friendly", WIRED, 2013
- "Paper Made From Stone". Kampier.com. 2005-11-30. Archived from the original on 2013-03-09. Retrieved 2013-03-16.