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Reflection is caused by an impedance mismatch between air and the glass. The reflection makes the white brighter, but dilutes black and other colors, which decreases contrast. LOCA suppliers aim to match the refractive index of glass and clear plastic PMMA (refractive index approximately 1.5) used in displays to minimize loss. LOCA suppliers ...
The first deck protectors were clear, but soon after, deck protectors were offered with opaque black backs, which would obscure the actual back of the card, allowing worn cards to be used without "marking" the deck. Other colors soon followed, and now a wide variety of deck protectors are available in many colors, and even with images on the back.
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.
[2] [3] TPU is also a popular material found in flexible outer cases of devices like mobile phones and keyboard protectors. [4] TPU is well known for its applications in wire and cable jacketing, hose and tube, in adhesive and textile coating applications, and as an impact modifier of other polymers. [5]
It is the registered trade mark of British Polythene Limited in numerous countries throughout the world. It is commonly between 4 and 10 mils (0.004 to 0.01 in./0.1 to 0.25 mm) thick and is available in clear, opaque, blue, and black. [1] [citation needed] Visqueen is used for many purposes.
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