The product is free from wood pulp and optical brightner and is acid free with alkaline reserve and anti-fungus treatment to guarantee a very long durability. It is certified Long Life ISO 9706 and PAT ISO 18916. Available in 5 thicknesses: 0.6, 1.2, 1.8, 2.4, 3 mm. Suitable for all restoration and conservation work, framing, presentation of photographs, packaging, conservation of documents and works of art, pass-partouts..