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Topic: Will Filmguard crack plastic rollers?
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 06-11-2002 09:27 AM
One test for the effect of solvents on materials is to soak a sample of the plastic (roller, core, film, or whatever) in the solvent for several days, and see if the plastic is softened, dissolved, or made more brittle.For film, wrap about a meter (3 feet) of the film into a tight roll and put it in one of the polyethylene "snap-top" film containers that 35mm still film cartridges are packaged in. Fill the container with the solvent being tested, and incubate the film sample. After a few days, remove the film sample and observe whether the solvent had any adverse effect on the film, such as stickiness, excessive curl, change in surface gloss, dyes being leached out, etc. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Research Labs, Building 69, Room 7525A Rochester, New York, 14650-1922 USA Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243 e-mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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Brad Miller
Administrator
Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 06-11-2002 12:52 PM
John, that's really not a good test for film, for Joe tried that a couple of years back with some products like Johnson's Paste Wax and I tried it with VitaFilm many years ago with a couple of others. The trailer core dissolved into Play-Dough and the film turned into a mucky, nasty blob of goo from the wax alone. Film does not like being torture treated like that. That is why there are directions for application on every kind of solvent. If a solvent was designed to have the film submerged into it, then that would be in the directions. If the solvent was not designed for that kind of application, then the film should not be treated like that. Specifically speaking, FilmGuard is pretty concentrated and a quart will clean more film than a gallon of any other cleaner.An extreme example, but one that should make my point...to make sure a roll of film is really "safety film", one should take an entire roll and sit it on a lit barbeque grill for several days? Of course not!
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