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Standard Test Methods for Microbiological Monitoring of Water Used for Processing Electron and Microelectronic Devices by Direct Pressure Tap Sampling Valve and by the Presterilized Plastic Bag Method
Automatische name übersetzung:
Standard-Prüfverfahren für Mikrobiologisches Monitoring an Wasser für die Verarbeitung und Electron Microelectronic Devices durch Direktdruck Tap Probenahmeventil und durch die vorsterilisiert Plastiktüte Methode
NORM herausgegeben am 1.7.2012
Bezeichnung normen: ASTM F1094-87(2012)
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.7.2012
SKU: NS-49116
Zahl der Seiten: 5
Gewicht ca.: 15 g (0.03 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
contamination, microbiological contamination, microbiological testing, semiconductor processing, water, water distribution system, ICS Number Code 07.100.20 (Microbiology of water)
Significance and Use | ||||||||||||||
5.1 These test methods provide a field technique for the bacteriological analysis of electronic process waters. The sampling of these waters and subsequent bacteriological analysis may be critical to electronic product yields. Bacteria can be the prime source of harmful contamination which can significantly reduce the yield of satisfactory microelectronic device production. 5.2 The test methods described here may be used both to monitor the bacteriological quality of water used in microelectronic product processing, and to locate the source of bacterial contamination in a water purification system. 5.3 These test methods are simple field methods, combining sampling and bacteriological analysis techniques that do not require bacteriological laboratory facilities. 5.4 The test methods described employ culture techniques for bacteriological analysis. The user should be aware that such techniques cannot provide a complete count of the total viable bacteria present, since clumps and clusters of bacteria will appear as one single colony when cultured, and since some viable bacteria will not grow under the test conditions used. However, a meaningful comparative bacteria count will be achieved by this method if the culturing of the sample is always done at the same temperature, and for the same period of time. The temperature of incubation should always be at 28 ± 2°C, and the period of incubation should be 48 h (or 72 h if time permits). The period of incubation and temperature should be the same for all comparative studies. |
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1. Scope | ||||||||||||||
1.1 These test methods cover sampling and analysis of high purity water from water purification systems and water transmission systems by the direct sampling tap and filtration of the sample collected in the bag. These test methods cover both the sampling of water lines and the subsequent microbiological analysis of the sample by the culture technique. The microorganisms recovered from the water samples and counted on the filters include both aerobes and facultative anaerobes. 1.2 Three methods are described as follows:
1.3 This standard does not
purport to address all of the safety concerns, if any, associated
with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and determine
the applicability of regulatory limitations prior to
use
Standard Specification for Reagent
Water Methods for Detection and Enumeration of
Microbiological Contaminants in Water Used for Processing Electron
and Microelectronic Devices (Withdrawn 1991) Standard Terminology Relating to Water
(Includes all amendments and changes 2/14/2024). Standard Test Method for On-site
Screening of Heterotrophic Bacteria in Water (Withdrawn 2004) |
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