Tyvek Envelopes

<h1>Tyvek Envelopes</h1>Author: <a title="Kevin Thomas" href="http://www.articlesbase.com/authors/kevin-thomas/62250.htm">Kevin Thomas</a> Tyvek is a brand of flashspun high-density polyethylene fibers. Tyvek is the name is a registered trademark of DuPont. The material is very strong and is difficult to tear but can easily be cut with scissors or any other sharp object. Water vapor can pass through Tyvek easily making it highly breathable but stops liquid water. The material lends itself to a variety of applications including medical packaging, <a href="http://www.davpack.co.uk/postal-packaging/protective-envelopes/envelopes-non-tear.htm">tyvek envelopes</a>, car covers, air and water intrusion barriers, labels, wristbands, mycology, and graphics. Tyvek is sometimes erroneously called Tyvex. Tyvek is a nonwoven product consisting of spunbond olefin fiber. It was discovered by DuPont researcher Jim White in 1955 who saw polyethylene fluff coming out of a pipe in a DuPont experimental lab. In 1965 it was trademarked and was first introduced for commercial purposes in 1967. According to DuPont, the fibers are just 0.5–10 µm compared to 75 µm for a single stand of human hair. The nondirectional fibers called plexifilaments are first spun and then bonded together by pressure and heat. Tyvek is used by the United States postal service for some of its Priority Mail and Express Mail packages. New Zealand used it for its driver's licenses from 1986 to 1999, and Costa Rica, the Isle of Man and Haiti have made banknotes from it. These banknotes are no longer in circulation and have become collector items. Some backpackers are now using homemade Tyvek ground cloths, finding that they are lighter, cheaper, and pack smaller than polypropylene tarpaulins. Tyvek coveralls are one-piece garments made of Tyvek, usually white in color. They are often worn by mechanics over their clothes to avoid contact with oil and fuel. They can also be worn for painting to protect skin and clothes from splattered paint, for installation of fiberglass insulation, by workers in laboratories and cleanrooms, and any other use where a disposable, one-time use coverall is needed. Tyvek coveralls are also used for some light hazardous materials applications, but do not provide the level of protection of a full hazmat suit. Tychem is a sub-brand of Tyvek rated for a higher level of protection. DuPont makes Tyvek clothing in different styles from laboratory coats and aprons to complete head-to-toe coveralls with hoods and boots. Although Tyvek superficially resembles paper as it can be written and printed on, it is made from plastic and therefore cannot be recycled with paper. Tyvek products are marked with the number 2 resin-code for HDPE and can be recycled with this type of plastic where facilities exist.About the Author: Kevin Thomas works for Davpack, a uk packaging supplier. Their friendly staff are waiting to help you choose the right <a href="http://www.davpack.co.uk">packaging</a> for your business.

Text and content © Copyright of Davenport Paper Co. Ltd 2009Article Source: <a href="http://www.articlesbase.com/">ArticlesBase.com</a> - <a href="http://www.articlesbase.com/ask-an-expert-articles/tyvek-envelopes-1338522.html" title="Tyvek Envelopes">Tyvek Envelopes</a>

Tyvek is a brand of flashspun high-density polyethylene fibers. Tyvek is the name is a registered trademark of DuPont. The material is very strong and is difficult to tear but can easily be cut with scissors or any other sharp object. Water vapor can pass through Tyvek easily making it highly breathable but stops liquid water. The material lends itself to a variety of applications including medical packaging, tyvek envelopes, car covers, air and water intrusion barriers, labels, wristbands, mycology, and graphics. Tyvek is sometimes erroneously called Tyvex.

Tyvek is a nonwoven product consisting of spunbond olefin fiber. It was discovered by DuPont researcher Jim White in 1955 who saw polyethylene fluff coming out of a pipe in a DuPont experimental lab. In 1965 it was trademarked and was first introduced for commercial purposes in 1967.

According to DuPont, the fibers are just 0.5–10 µm compared to 75 µm for a single stand of human hair. The nondirectional fibers called plexifilaments are first spun and then bonded together by pressure and heat.

Tyvek is used by the United States postal service for some of its Priority Mail and Express Mail packages. New Zealand used it for its driver's licenses from 1986 to 1999, and Costa Rica, the Isle of Man and Haiti have made banknotes from it. These banknotes are no longer in circulation and have become collector items. Some backpackers are now using homemade Tyvek ground cloths, finding that they are lighter, cheaper, and pack smaller than polypropylene tarpaulins.

Tyvek coveralls are one-piece garments made of Tyvek, usually white in color. They are often worn by mechanics over their clothes to avoid contact with oil and fuel. They can also be worn for painting to protect skin and clothes from splattered paint, for installation of fiberglass insulation, by workers in laboratories and cleanrooms, and any other use where a disposable, one-time use coverall is needed. Tyvek coveralls are also used for some light hazardous materials applications, but do not provide the level of protection of a full hazmat suit. Tychem is a sub-brand of Tyvek rated for a higher level of protection. DuPont makes Tyvek clothing in different styles from laboratory coats and aprons to complete head-to-toe coveralls with hoods and boots.

Although Tyvek superficially resembles paper as it can be written and printed on, it is made from plastic and therefore cannot be recycled with paper. Tyvek products are marked with the number 2 resin-code for HDPE and can be recycled with this type of plastic where facilities exist.

Kevin Thomas works for Davpack, a uk packaging supplier. Their friendly staff are waiting to help you choose the right packaging for your business. Text and content © Copyright of Davenport Paper Co. Ltd 2009

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