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The photographic glass plates are stored vertically on the long side of the plate in storage boxes whose material is free of acid, lignin, polyvinyl chloride (PVC), dye, sulfur, and alum. The acidity of any paper storage used should show a pH between 7 and 8.5. [26] Glass plates should not be packed tightly and should not rub against each other.
Where the medium itself needs to be preserved, for example if a document is a crayon sketch by a famous artist on paper, a complex process of preservation may be used. Depending on the condition and importance of the item this can include gluing the media onto more stable media, or protective enclosing of the media.
A paper conservator surveying a collection of materials in storage. Storage in a cool, dry, clean, and stable location can extend the life of an item. [51] Manuscripts and paper documents are often stored in protective archival-quality boxes and folders, made of acid-free and lignin-free materials. [52]
A startup company in North Central Florida, Fracture was founded by two graduates of The University of Florida, Alex Theodore and Abhi Lokesh. [4] [5] They began selling their product in December 2009. [6] Theodore and Lokesh raised $1.5 million in funding from outside investors, [7] including Tamiami Angel Fund I in 2012. [8]
PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...
With further stress or over time, this void can develop into a subcritical crack, growing slowly until it reaches a critical length, causing the sample to fracture. For polymers of practical molecular weight, craze growth is necessary but not sufficient for fracture. The critical step in the fracture of most glassy polymer crazes is the ...
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Breakdown of a charged specimen may also be manually triggered by poking the plastic with a pointed conductive object to create a point of excessive voltage stress. During the discharge, the powerful electric sparks leave thousands of branching chains of fractures behind, creating a permanent Lichtenberg figure inside the specimen. Although the ...