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Tyvek's properties—such as being difficult to tear but easily cut, and waterproof against liquids while allowing water vapor to penetrate—have led to it being used in a variety of applications. Tyvek is often used as housewrap, a synthetic material used to protect buildings during construction, or as personal protective equipment (PPE). [1]
Air barriers control air leakage into and out of the building envelope.Air barrier products may take several forms: Mechanically-attached membranes, also known as housewraps, usually a polyethylene-fiber or spun-bonded polyolefin, such as Tyvek is a generally accepted moisture barrier and an air barrier (ASTM E2178).
The simplest, least expensive package is a paper envelope. More expensive versions add a transparent window to the envelope allowing the disc label to be seen. [21] The envelope can also be made out of spunbonded polyethylene (trade-named Tyvek) which is stronger and lighter than paper and is resistant to moisture. [22]
Mailing envelopes and small packages may receive as many as 27 handlings during shipment with the maximum drop height of 1.2 metres (3.9 ft). [1] The contents of the mailing envelopes often need protection from shock and vibration damage. Cushioning or padding can be built into the mailing envelope to help protect the contents.
An alternative polymer of polyethylene fibres marketed as Tyvek by DuPont was developed for use as currency by the American Bank Note Company in the early 1980s. Haiti: 1982 Haiti released Tyvek-made Gourde banknotes in denominations of 1, 2, 50, 100, 250 & 500. The same denominations and a 5 Gourdes banknote were also released on paper.
Mark Ruffalo's new film 'Dark Waters' is generating Oscar buzz as well as concern about unexpectedly toxic chemicals.
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