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The Cristal Laser sheet-protectors 502 and 904 from Prat are made from polypropylene and are therefore free of both acid and plasticizer (archival quality). Polypropylene sheet-protectors are considerably clearer than normal sleeves, do not discolour the presented materials even when stored for longer time periods and will not stick to the surface of the material inserted into them. It should also be noted, however, that these sheet-protectors are less resistant to scratching than those made from PVC. Both Cristal Laser 502 and 904 have successfully passed the Photographic Activity Test (PAT) which has been set up in order to judge per international standards (ISO 18916) whether a photo sheet-protector is archival quality or not. The sheet protectors Cristal Laser 502 are open both at the top and at the holes. They fit into the Prat spiral books Laser Modebook 149 and Pampa.
Importante!
The given dimensions apply to the usable space of the sheet-protectors.
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