HDPE ? ACID? Grocery Bags-Neg sleeve?

Discussion in 'B&W: Film, Paper, Chemistry' started by Dave Wooten, Apr 27, 2005.

  1. Dave Wooten

    Dave Wooten Subscriber

    Messages:
    2,720
    Joined:
    Nov 1, 2004
    Location:
    Vegas/myster
    Shooter:
    ULarge Format
    My local grocery put out some new plastic bags in the produce dept. they look quite nice.....14 1/2" x 19" I was wondering if they are archival?

    recycle triangle has a numbeer 2 in it and HDPE There is no manufacturer's name on it.

    Thanks
    Dave in Vegas
     
  2. Dave Wooten

    Dave Wooten Subscriber

    Messages:
    2,720
    Joined:
    Nov 1, 2004
    Location:
    Vegas/myster
    Shooter:
    ULarge Format
    I guess my real question is, is HDPE archival?
     
  3. Bruce Osgood

    Bruce Osgood Membership Council Council

    Messages:
    2,612
    Joined:
    Sep 9, 2002
    Location:
    Brooklyn, N.Y.
    Shooter:
    Multi Format
  4. Dave Wooten

    Dave Wooten Subscriber

    Messages:
    2,720
    Joined:
    Nov 1, 2004
    Location:
    Vegas/myster
    Shooter:
    ULarge Format
    Bruce
    thanks that site was very informative....not being a chemist I am still not sure about the suitability for neg sleeves but it seems HDPE might be the best of the bunch?

    I would love to be able to use these for my larger negs but don't wont to be hasty-
     
  5. Peter Rockstroh

    Peter Rockstroh Member

    Messages:
    159
    Joined:
    Apr 26, 2005
    Location:
    Guatemala
    Shooter:
    Multi Format
    archival plastics

    Some plastics could be called "archival," if they are kept away from light. Nearly all plastic resins degrade under the influence of U.V. radiation, but some have better properties - related to photographic materials than others.
    PVC (the stuff that smells like shower curtains) is very unstable and the smell comes from the plasticizer that slowly migrates to the surface. PVC should be kept far away from photos, as the plasticizer softens and attacks the emulsion. PVC also releases chlorine, which in combination with humidity forms hydrochloric acid and gives photos that "acid wash" look.
    I would suggest staying away from any film that "clings." Self-adhesive films are mixtures of resins, in which one resin migrates to the surface and has tacking characteristics. If you´ve spend a lot of time making and processing an image, you certainly don´t want anything sticking to it.
    PVC bottles can be used for short term storage of photochemicals, but they are not the best choice.
    The poliolefins (polyethylene and polypropylene) are "archival." For negative or slide storage, polypropylene has superior optical properties compared to polyethylene (PE is milky and PP can be clarified). High Density Polyethylene (HDPE) and Polypropylene (PP) bottles can be used to store photochemicals. PP bottles are a better choice, as their clarity allows for quality control, while hazy PE bottles might leave particles undetected.
    PET bottles, the material used for most carbonated beverages should only be used as short-term storage solutions. They tend to deform with heat and certain solvents.
    Your best choice are Polycarbonate (PC) containers. PC has excellent heat, chemical and structural stability and is crystal clear. There are several manufacturers that produce amber-colored bottles which are great for storing photosensitive liquids.
     
  6. Dave Wooten

    Dave Wooten Subscriber

    Messages:
    2,720
    Joined:
    Nov 1, 2004
    Location:
    Vegas/myster
    Shooter:
    ULarge Format
    Peter thanks so much,

    I am always amazed at the knowledge on these forums......I am going to initially go ahead and use some of these bags for neg storage--what caught my eye was the size - a bit larger that 14 x 17

    HDPE then is "archival"

    Dave in Vegas