This is a nice article on the selection of PTFE for high purity water applications. PTFE can also be utilized for lower grade waters where applicable.
Executive overview
Polytetrafluoroethylene (PTFE) is an ideal material for semiconductor fluid handling applications. It is inherently inert because it is composed of only carbon and fluorine atoms. This carbon fluorine bond is one of the strongest known. The strength of these bonds prevents PTFE from being degraded by chemicals or absorbing them. These bonds also permit PTFE to withstand temperatures ranging from -270°C to 260°C. This article discusses the selection criteria when using PTFE for ultrahigh-purity fluid handling applications.
Selecting PTFE for ultrahigh-purity fluid handling applications - Solid State Technology
Tuesday, April 27, 2010
Monday, April 26, 2010
Understanding laboratory plumbing systems: water
@RandDMagazine This article from R&D Magazine outlines many of the laboratory water system design issues typically encountered.
Yale postdoc shot, killed - The Scientist - Magazine of the Life Sciences
Saddened by the news. Are thoughts and prayers are with those associated with the person: Yale postdoc shot, killed - The Scientist - Magazine of the Life Sciences
Monday, April 5, 2010
Understanding Laboratory Waste and Vent Systems
RT @RandDMagazine Understanding laboratory waste and vent systems
http://bit.ly/dxnAKW
Nice basic understanding of laboratory waste systems. We are finding that local neutralization, while requiring more maintenance, is also more desirable by local Officials/AHJ. Additionally, it reduces over-all costs on the piping systems substantially. This approach is not always possible, but should be reviewed at the outset of a project during the engineering planning stages.
I also must add that I do not fully agree with the “Glass Manufacturer’s” comment. In my personal experience, glass is rarely a viable choice because other materials can typically be found that substitute as nicely and have lower budget impact. Laboratories inherently rarely have the plenum ceilings that make plastic a problem. Localized neutralization in any case limits the lengths of acid waste piping. Glass certainly has its place and should not be dismissed. Matching the application to the materials is the early engineering we need to do.
http://bit.ly/dxnAKW
Nice basic understanding of laboratory waste systems. We are finding that local neutralization, while requiring more maintenance, is also more desirable by local Officials/AHJ. Additionally, it reduces over-all costs on the piping systems substantially. This approach is not always possible, but should be reviewed at the outset of a project during the engineering planning stages.
I also must add that I do not fully agree with the “Glass Manufacturer’s” comment. In my personal experience, glass is rarely a viable choice because other materials can typically be found that substitute as nicely and have lower budget impact. Laboratories inherently rarely have the plenum ceilings that make plastic a problem. Localized neutralization in any case limits the lengths of acid waste piping. Glass certainly has its place and should not be dismissed. Matching the application to the materials is the early engineering we need to do.
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