Negative covers for order and overview in the archive. Perfect protection against dust and fingerprints. With Euro holes for Herma ring binders and all-purpose files. Tested safety - without chemical influences on the negatives. Filing tables of contents enclosed. This is a thermoplastic material. They are welded during production. The film is tight, so the film cannot breathe, i.e. residues of processing chemicals remain in the cover and cannot escape. This can become visible during long-term archiving (change in the emulsion). The archiving of negatives in a negative cover made of polypropylene film is particularly suitable for short-term archiving.