ASTM F91-06(2019)
(Practice)Standard Practice for Testing for Leaks in the Filters Associated With Laminar Flow Clean Rooms and Clean Work Stations by Use of a Condensation Nuclei Detector
Standard Practice for Testing for Leaks in the Filters Associated With Laminar Flow Clean Rooms and Clean Work Stations by Use of a Condensation Nuclei Detector
ABSTRACT
This practice covers the testing of the integrity of high-efficiency particulate air (HEPA) filters installed in laminar flow clean rooms of the ceiling to floor or wall to wall type, and laminar flow clean work stations using condensation nuclei detector. The recommended practice may be used to detect faults or voids in the filter media itself or in the joints between the filter and the room or work station structure. The preparation for testing and the procedure for the proper testing are presented in details.
SCOPE
1.1 This practice covers the testing of the integrity of high-efficiency particulate air (HEPA) filters installed in laminar flow clean rooms of the ceiling to floor or wall to wall type, and laminar flow clean work stations. The recommended practice may be used to detect faults or voids in the filter media itself or in the joints between the filter and the room or work station structure. The determination of filter media efficiency is not within the scope of this practice.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—The values given in parentheses in inch-pound units are for information only.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F91 − 06 (Reapproved 2019)
Standard Practice for
Testing for Leaks in the Filters Associated With Laminar
Flow Clean Rooms and Clean Work Stations by Use of a
Condensation Nuclei Detector
This standard is issued under the fixed designation F91; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.1.4 leak—a gap or void in the filter media, or in the
associated gaskets, which permits unfiltered room air to pen-
1.1 This practice covers the testing of the integrity of
etrate the clean room or clean work station.
high-efficiency particulate air (HEPA) filters installed in lami-
nar flow clean rooms of the ceiling to floor or wall to wall type,
3. Summary of Practice
and laminar flow clean work stations. The recommended
3.1 This recommended practice takes advantage of the fact
practice may be used to detect faults or voids in the filter media
that a HEPAfilter retains a high percentage of the condensation
itself or in the joints between the filter and the room or work
nuclei found in ordinary room air. In this recommended
station structure. The determination of filter media efficiency is
practice a nuclei counting apparatus is arranged to sample
not within the scope of this practice.
small areas at the filter surface and the joints at the filter edges.
1.2 The values stated in SI units are to be regarded as
The HEPA filter effluent normally shows a low nuclei count
standard. No other units of measurement are included in this
(<100 particles/cm ).When a leaking filter area is encountered,
standard.
an increase of at least ten-fold in the particle count is noticed
1.2.1 Exception—The values given in parentheses in inch-
within the 2-s response time of the nuclei counter.
pound units are for information only.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
2,3
4.1 Condensation Nuclei Counter.
responsibility of the user of this standard to establish appro-
4.2 Plastic Tubing , 9.5 mm ( ⁄8 in.) in outside diameter;
priate safety, health, and environmental practices and deter-
6.5 mm ( ⁄4 in.) in inside diameter; of suitable length, not to
mine the applicability of regulatory limitations prior to use.
exceed 1.5 m (5 ft).
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.3 Glass Laboratory Funnel, 50 mm in outside diameter,
ization established in the Decision on Principles for the
7 mm in stem diameter, 80 mm over-all length.
Development of International Standards, Guides and Recom-
4.4 Double-Pole Single-Throw Relay, 115 V, 8 A.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Preparation for Test
2. Terminology
5.1 Assemble the apparatus by slipping one end of the
plastic hose over the funnel stem, and the other end over the
2.1 Definitions:
nuclei counter input nipple.
2.1.1 condensation nuclei—particles within the size range
from 0.001 to 0.1-µm radius.
5.2 Turn on the electrical supply to the nuclei counter and
allow 30 min warm up time with the input tube sampling the
2.1.2 HEPA filter—high-efficiency particulate air filter.
effluent from a HEPA filter.
2.1.3 laminar flow—airflow in which the air confined within
the walls of a room or a smaller work station moves as an 5.3 Measure the nuclei concentration at the intake to the
isovelocity front along parallel flow lines. HEPA filter. A concentration of less than 1000 particles/cm
This practice is under the jurisdiction of ASTM Committee E21 on Space
Simulation andApplications of Space Technology and is the direct responsibility of Rich,T.A., “AContinuous Recorder for Condensation Nuclei,” Geofisica Pura
Subcommittee E21.05 on Contamination. e Applicata, Milano, Vol 50, 1961, III, pp. 46–52.
Current edition approved July 1, 2019. Published July 2019. Originally approved General Electric Co., Schenectady, NY, Model No. 112L482G1 has been found
in 1968. Last previous edition approved in 2011 as F91 – 06(2011). DOI: 10.1520/ satisfactory.
F0091-06R19. Tygon tubing or equivalent has been found satisfactory for this purpose.
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