I cannot understand these complaints about polypropelene scratching negatives!?
I have been using Print File for over a decade now and have yet to experience scratching due to their use. Have been using poly in general for over 15 years and glassine ( also spelt glacene) before that.
I am by trade a photographic archivist and I am always extremely careful about what I use and how I use it - never had a problem with polypropelene sleeves at all and I have an archive of over 15,000 35mm, 120 and 4x5 negatives, all b/w, as well as over 20,000 'happy snaps' all stored in poly pages. Even my colour tranny work ( less than 2,000 images ) is stored in poly slide pages.
Regards
Peter