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Three punched pockets. A punched pocket (UK English), plastic wallet (UK English), poly pocket (UK English), slippery fish (Sussex, England), sheet protector (US English), plastic sleeves (AU English), “page protector” (US English), or sometimes perforated document bag, is a flat, slit plastic bag with a perforated edge used to hold paper documents.
Top of a copper clad Perfboard with solder pads for each hole. Perfboard is a material for prototyping electronic circuits.It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing.
A modern solderless breadboard socket consists of a perforated block of plastic with numerous tin plated phosphor bronze or nickel silver alloy spring clips under the perforations. The clips are often called tie points or contact points. The number of tie points is often given in the specification of the breadboard.
The holes are used to accept pegs or hooks to support various items, and perforated hardboards are therefore used for purposes such as tool boards in workshops. Peg-Board is an expired trademark used as a brand name by the Masonite Corporation , first used in 1962, [ 1 ] which is often used as a generic term for perforated storage boards made ...
A partial image of a sheet of US Postage stamps, 1940 issue, featuring perforations. A perforation is a small hole in a thin material or web. There is usually more than one perforation in an organized fashion, where all of the holes collectively are called a perforation.
Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).
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