ASTM F21-65(2007)
(Test Method)Standard Test Method for Hydrophobic Surface Films by the Atomizer Test
Standard Test Method for Hydrophobic Surface Films by the Atomizer Test
SIGNIFICANCE AND USE
The atomizer test as described in this test method is nondestructive and may be used for control and evaluation of processes for the removal of hydrophobic contaminants. The test may also be used for the detection and control of hydrophobic contaminants in processing ambients. For this application, a surface free of hydrophobic films is exposed to the ambient and subsequently tested.4
SCOPE
1.1 This test method covers the detection of the presence of hydrophobic (nonwetting) films on surfaces and the presence of hydrophobic organic materials in processing ambients. When properly conducted, the test will enable detection of fractional molecular layers of hydrophobic organic contaminants. On very rough or porous surfaces the sensitivity of the test may be significantly decreased.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F21 − 65(Reapproved 2007)
Standard Test Method for
Hydrophobic Surface Films by the Atomizer Test
ThisstandardisissuedunderthefixeddesignationF21;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope the test is based upon the pattern of wetting. In the absence of
hydrophobic films, the impinging water droplets will wet the
1.1 This test method covers the detection of the presence of
surface and spread immediately to form a continuous water
hydrophobic (nonwetting) films on surfaces and the presence
film. In areas where hydrophobic materials are present on the
of hydrophobic organic materials in processing ambients.
surface, the sprayed droplets will not wet the surface and
When properly conducted, the test will enable detection of
spread but will tend to remain as fine droplets.
fractional molecular layers of hydrophobic organic contami-
nants. On very rough or porous surfaces the sensitivity of the
5. Significance and Use
test may be significantly decreased.
5.1 The atomizer test as described in this test method is
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
nondestructive and may be used for control and evaluation of
as the standard. The values given in parentheses are for
processes for the removal of hydrophobic contaminants. The
information only.
test may also be used for the detection and control of
1.3 This standard does not purport to address all of the hydrophobic contaminants in processing ambients. For this
application, a surface free of hydrophobic films is exposed to
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- the ambient and subsequently tested.
priate safety and health practices and determine the applica-
6. Interferences
bility of regulatory limitations prior to use.
6.1 Loss of sensitivity may result from either of the follow-
2. Referenced Documents
ing factors:
6.1.1 The presence of hydrophilic substances on the surface
2.1 ASTM Standards:
to be tested, test equipment, or test materials, or
D351Classification for Natural Muscovite Block Mica and
6.1.2 An unusually rough or porous surface condition.
Thins Based on Visual Quality
7. Apparatus
3. Terminology
7.1 Spray Gun Atomizer.
3.1 Definitions:
3.1.1 hydrophilic—having a strong affinity for water; wet-
7.2 Low Power Microscope(5×to50×),andlightsourcefor
table.
observation of small piece parts.
3.1.2 hydrophobic—having little affinity for water; nonwet-
8. Reagents and Materials
table.
8.1 Acetone, reagent grade.
4. Summary of Test Method
8.2 Mica Blanks,preferably1in.(25mm)by 2in.(50mm)
4.1 The atomizer test is performed by subjecting the dry by 0.015 in. (0.38 mm) or larger, having a minimum ASTM
surface to be tested to a fine water spray. The interpretation of
quality V6 as described in Classification D351.
8.3 Oleic or Stearic Acid—A 0.005 to 0.05% solution in
This test method is under the jurisdiction of ASTM Committee E21 on Space
acetone.
Simulation andApplications of SpaceTechnology and is the direct responsibility of
8.4 Oxygen—Filtered low-pressure (15 psi min) oxygen or
Subcommittee E21.05 on Contamination.
Current edition approved April 1, 2007. Published April 2007. Originally
other suitable gas that is free of hydrophobic and hydrophilic
approved in 1962. Last previous edition approved in 2002 as F21–65(2002). DOI:
substances.
10.1520/F0021-65R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Feder, D. O., and Koontz, D. E., “Detection, Removal and Control of Organic
Standards volume information, refer to the standard’s Document Summary page on Contaminants in the Production of Electron Devices,” ASTM STP 246, Am. Soc.
the ASTM website. Testing Mats., p. 40 (1959).
Linford, H. B., and Saubestre, E. B., “ANew Degreasing Evaluation Test: The PaascheAirBrushModelVL-1oritsequivalenthasbeenfoundsatisfactoryfor
Atomizer Test,” ASTM Bulletin, May 1953, p. 47. this purpose.
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F21 − 65 (2007)
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