polyropylene

polyropylene - A plastic material highly suitable for the acid-free archival storage of works on paper and other small two-dimensional object.

trademarks for polypropylene

trade name	manufacturer, country
Propafilm ®	ICI, UK
Propathene ®	ICI, UK
Propylex ®	British Celanese, UK
Vulkide B ®	ICI, UK

Examples:

Transparent polypropylene sheet and photograph protectors, each with pockets of various sizes, the sides and bottom of which are welded allowing top insertion. Each is c. 9 x 11 inches, three-hole-punched for use in three-ring binders, and is free of polyvinyl chloride (PVC) and plasticizers for safe, long-term storage of photographic slides, negatives, prints, and other works on paper. Over time, polypropylene is less likely to yellow, crack or tear than other materials.

Synthetic Industries, company design and manufacture, Chattanooga, TN, Pyramat Erosion Mat, 1992, polypropylene, 78 x 120 x 1/2 inches (198.1 x 304.8 x 1.3 cm), Museum of Modern Art, NY.

Also see bin, collect, deltiologist, ephemera, exonumia, frame, memorabilia, philately, polyester resins, polyethylene, polymer, polystyrene, polyvinyl acetate, polyvinyl alcohol, polyvinyl chloride (PVC), portfolio, scripophily, solander box, and trademark (®).