PURAFIL NEWS

Purafil Technical Director, Chris Muller, was recently named the recipient of the 2008 Maurice Simpson Technical Editors Award by the Institute of Environmental Sciences and Technology (IEST). Chris was nominated for his comprehensive, technical paper entitled, Comparison of Chemical Filters for the Control of Airborne Molecular Contamination. The paper was published in the 2007 Journal of the IEST, garnering Chris an award traditionally presented to authors of the best technical papers published by the IEST during the preceding year.

PURAFIL EVENTS

Purafil ESD and Kazmier & Associates will be exhibiting at the Kentucky Tennessee Water Professionals Conference, which will be held on July 20-23, 2008 at the at the Knovxille Convention Center in Knoxville, TN. Stop by Purafil ESD's Booth #528 to see our Engineered Solutions for the Water & Wastewater Market!

PURAFIL LITERATURE

White Paper: Airborne Molecular Contamination Control in Semiconductor Fabs: A Practical Approach

Case Study: Purafil Helps NASA Safeguard Testing in the Hubble Telescope Cleanroom

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AIR QUALITY STANDARDS


Purafil’s passive and active environmental assessment monitors use copper and silver sensors to measure the severity level of airborne molecular contaminants (AMC). With more than 30 years of experience in providing clean air solutions, Purafil offers a comprehensive database of reactivity assessment results from cleanroom facilities worldwide. From these results, and taking into consideration currently recommended AMC control levels, the following Air Quality Standards have been established.

Cleanroom Air Quality Standards
Copper Corrosion
Silver Corrosion
Air Quality Classification
Reactivity Rate
(Angstroms / 30 days)
Air Quality Classification
Reactivity Rate (Angstroms / 30 days)
C1
Pure
< 90
S1
Pure
< 40
C2
Clean
< 150
S2
Clean
< 100
C3
Moderate
< 250
S3
Moderate
< 200
C4
Harsh
< 350
S4
Harsh
< 300
C5
Severe
> 350
S5
Severe
> 300

The purpose of the Air Quality Standards is to classify cleanroom environments according to the severity of copper and silver sensor corrosion. The standard identifies five Air Quality Classifications — pure, clean, moderate, harsh, and severe — based on the rate of corrosion (measured in Angstroms) over a period of 30 days. The Air Quality Classifications, defined as follows, characterize the environment as to its possible effects on process reliability.

Pure: AMC does not pose a measurable threat to processes.
Clean: AMC is measurable, but does not pose an immediate threat to processes.
Moderate: AMC in slightly above the levels considered acceptable for reliable operation.
Harsh: AMC is above the levels considered acceptable for reliable operation.
Severe: AMC poses an immediate threat to reliable operations.