Polypropylene, Polyethylene and Complex Plastics
Only virgin polypropylene without this slip coating should be used for photographs or archival material. Virgin polyethylene, without plasticisers or harmful additives that might off-gas, is suitable for archival storage but it lacks rigidity and clarity. When applied as a thin film to polyester it gains strength and rigidity but the crystallike transparency is reduced. The recent inclusion of reactive copper and carbon particles in polyethylene and other plastics offers new possibilities for the long-term protection of archival material. This is also the case with multi-layer oxygen and moisture-barrier films designed for use with vacuum, inert gas purging or oxygen-scavengers, all of which can slow down the rate of deterioration of a variety of sensitive materials.
The Timecare® Polyester HCL (High Clarity Laminate) Album Pages, developed for the popular Timecare® Ringbinder Boxes, utilise a combination of the strength and durability of polyester with the ease of welding of polyethylene. Album pages made solely from polyethylene or polypropylene, although cheaper in material and production costs, do not offer the same level of strength or protection against fire in a disaster scenario.
The same multi-layer technology employed by the HCL album pages is used for the oxygen and moisture-barrier films and pouches listed in this catalogue. These products allow visible storage in a controlled atmosphere with the absence of oxygen; achieved by gas-flushing or oxygenscavengers using nanotechnology.
Heavyweight, matt polypropylene is an excellent material for making large drawer files. The matt surface is nonreflective and has reduced surface contact with the contents. It can be welded or sewn as with our Visifile’ folders. In use, it makes an almost indestructible folder that allows the contents to be seen at a glance.