Two-piece boxes can be supplied in a variety of materials and structures, suitable for archival storage. A two piece box means that the box has a base and a lid. This style box can either have a full height lid, meaning the lid meets with the bottom of the box, or a shallow lid like a shoe box.
All our archival grade boxes are made out of paperboard with below assured quality parameters:
- 100 % bleached cellulose without the usage of recycling fibers
- Kappa level 1 – 2 = lignin-free
- pH 7.5 - 10.0 = acid-free (in accordance with ISO 6588-1:2012)
- Alkaline buffer > 3 % natural calcium carbonate
- Sizing: neutral/synthetic (without alum additive)
- Sizing according to Cobb60 < 25
- Without optical brightening agents
- Light-fastness approx. 7 – 8 (= extremely good) in accordance with the wool scale (EN ISO 105-B02)
- Photographic Activity Test (PAT) passed in accordance with ISO 18916:2007
