Why does Print File use polypropylene and not polyethylene for their print preservers, slide preservers, and album pages?

We believe the presentation of your valuable photographs requires the clearest and most transparent archival preserver available. Print File’s superior polypropylene offers this clarity whereas polyethylene is more translucent. Because the film is protected from rubbing against the film by the mounts, slides are not subject to the same static problems as negatives. Furthermore, photographs are not customarily reproduced from the print and the consequences of dust on the photographs are less critical to the final outcome of your preserved image.