ASTM F22-21
(Test Method)Standard Test Method for Hydrophobic Surface Films by the Water-Break Test
Standard Test Method for Hydrophobic Surface Films by the Water-Break Test
SIGNIFICANCE AND USE
5.1 The water-break test as described in this test method is rapid, nondestructive, and may be used for control and evaluation of processes for the removal of hydrophobic contaminants. A water-break “free” test is commonly used for in-process verification of the absence of surface contaminants on metal surfaces that may interfere with subsequent surface treatments such as priming, conversion coating, anodizing, plating, or adhesive bonding
5.2 This test method is not quantitative and is typically restricted to applications where a go/no go evaluation of cleanliness will suffice.
5.3 The test may also be used for the detection and control of hydrophobic contaminants in processing environments. For this application, a witness surface free of hydrophobic films is exposed to the environment and subsequently tested. The sensitivity of this test will vary with the level of airborne contaminant and the duration of exposure of the witness surface.
5.4 For quantitative measurement of surface wetting, test methods that measure contact angle of a sessile drop of water or other test liquid may be used in some applications. Measurement methods based on contact angle are shown in Test Methods C813, D5946, and D7490; and Practice D7334.
5.4.1 Devices for in situ measurement of contact angle are available. These devices are limited to a small measurement surface area and may not reflect the cleanliness condition of a larger surface. For larger surface areas, localized contact angle measurement, or other quantitative inspection, combined with water-break testing may be useful.
5.5 For surfaces that cannot be immersed or doused with water, or where such immersion or dousing is impractical, such as previously coated large parts or assemblies, prior to the application of paints, primers or other organic coatings, Test Method F21 may be better suited for the evaluation of surface cleanliness than this test method.
Note 2: This test method is not appropriate where line o...
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 environments. When properly conducted, the test will enable detection of molecular layers of hydrophobic organic contaminants. On very rough or porous surfaces, the sensitivity of the test may be significantly decreased.
1.2 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
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.
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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: F22 − 21
Standard Test Method for
1
Hydrophobic Surface Films by the Water-Break Test
ThisstandardisissuedunderthefixeddesignationF22;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* D5946Test Method for Corona-Treated Polymer Films Us-
ing Water Contact Angle Measurements
1.1 This test method covers the detection of the presence of
D7334Practice for Surface Wettability of Coatings, Sub-
hydrophobic (nonwetting) films on surfaces and the presence
strates and Pigments by Advancing Contact Angle Mea-
of hydrophobic organic materials in processing environments.
surement
When properly conducted, the test will enable detection of
D7490TestMethodforMeasurementoftheSurfaceTension
molecular layers of hydrophobic organic contaminants. On
of Solid Coatings, Substrates and Pigments using Contact
veryroughorporoussurfaces,thesensitivityofthetestmaybe
Angle Measurements
significantly decreased.
F21Test Method for Hydrophobic Surface Films by the
1.2 Units—The values stated in SI units are to be regarded
Atomizer Test
as standard. The values given in parentheses after SI units are
providedforinformationonlyandarenotconsideredstandard.
3. Terminology
1.3 This standard does not purport to address all of the
3.1 Definitions:
safety concerns, if any, associated with its use. It is the
3.1.1 contact angle, n—the interior angle that a drop makes
responsibility of the user of this standard to establish appro-
between the substrate and a tangent drawn at the intersection
priate safety, health, and environmental practices and deter-
between the drop and the substrate as shown in Fig. 1; this is
mine the applicability of regulatory limitations prior to use.
theangleformedbyaliquidatthethreephaseboundarywhere
1.4 This international standard was developed in accor-
a liquid, gas (air), and solid intersect.
dance with internationally recognized principles on standard-
3.1.2 hydrophilic, adj—having a strong affinity for water,
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- wettable.
mendations issued by the World Trade Organization Technical
3.1.2.1 Discussion—Hydrophilic surfaces exhibit zero con-
Barriers to Trade (TBT) Committee.
tact angle with water. A sessile drop of water applied to the
surface will immediately spread out to form a film.
2. Referenced Documents
3.1.3 hydrophobic, adj—havinglittleaffinityforwater,non-
2
2.1 ASTM Standards:
wettable.
C813TestMethodforHydrophobicContaminationonGlass
3.1.3.1 Discussion—Hydrophobic surfaces exhibit contact
by Contact Angle Measurement
angles between a sessile drop of water and the surface
D351Classification for Natural Muscovite Block Mica and
appreciably greater than zero.
Thins Based on Visual Quality
3.1.4 sessile drop, n—a drop of liquid sitting on the upper
D1193Specification for Reagent Water
side of a horizontal surface.
D2578TestMethodforWettingTensionofPolyethyleneand
Polypropylene Films
3.1.5 water-break, n—a break in the continuity of a film of
water on a surface on removal from an aqueous bath or on
removal of a flowing water source from the surface.
1
This test method is under the jurisdiction of ASTM Committee E21 on Space
Simulation andApplications of SpaceTechnology and is the direct responsibility of
Subcommittee E21.05 on Contamination. 4. Summary of Test Method
Current edition approved Dec. 1, 2021. Published December 2021. Originally
4.1 The water-break test is performed by withdrawing the
approved in 1962. Last previous edition approved in 2021 as F22–13(2021). DOI:
10.1520/F0022-21.
surface to be tested, in a vertical position, from a container of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
purified water and observing the behavior of the water. For
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
large parts, the test surface may be doused with water and the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. water behavior observed on removal of the water source.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F22−21
measurement, or other quantitative inspection, combined w
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F22 − 13 (Reapproved 2021) F22 − 21
Standard Test Method for
1
Hydrophobic Surface Films by the Water-Break Test
This standard is issued under the fixed designation F22; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 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 environments. When properly conducted, the test will enable detection of molecular
layers of hydrophobic organic contaminants. On very rough or porous surfaces, the sensitivity of the test may be significantly
decreased.
1.2 Units—The values stated in SI units are to be regarded as the standard. The inch-pound values given in parentheses are for
information only.after SI units are provided for information only and are not considered standard.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C813 Test Method for Hydrophobic Contamination on Glass by Contact Angle Measurement
D351 Classification for Natural Muscovite Block Mica and Thins Based on Visual Quality
D1193 Specification for Reagent Water
D2578 Test Method for Wetting Tension of Polyethylene and Polypropylene Films
D5946 Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements
D7334 Practice for Surface Wettability of Coatings, Substrates and Pigments by Advancing Contact Angle Measurement
D7490 Test Method for Measurement of the Surface Tension of Solid Coatings, Substrates and Pigments using Contact Angle
Measurements
F21 Test Method for Hydrophobic Surface Films by the Atomizer Test
3. Terminology
3.1 Definitions:
1
This test method is under the jurisdiction of ASTM Committee E21 on Space Simulation and Applications of Space Technology and is the direct responsibility of
Subcommittee E21.05 on Contamination.
Current edition approved April 1, 2021Dec. 1, 2021. Published May 2021December 2021. Originally approved in 1962. Last previous edition approved in 20132021 as
F22 – 13.F22 – 13(2021). DOI: 10.1520/F0022-13R21.10.1520/F0022-21.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F22 − 21
3.1.1 contact angle, n—the interior angle that a drop makes between the substrate and a tangent drawn at the intersection between
the drop and the substrate as shown in Fig. 1; this is the angle formed by a liquid at the three phase boundary where a liquid, gas
(air)(air), and solid intersect.
3.1.2 hydrophilic—hydrophilic, adj—having a strong affinity for water, wettable.
3.1.2.1 Discussion—
Hydrophilic surfaces exhibit zero contact angle with water. A sessile drop of water applied to the surface will immediately spread
out to form a film.
3.1.2.1 Discussion—
Hydrophilic surfaces exhibit zero contact angle with water. A sessile drop of water applied to the surface will immediately spread
out to form a film.
3.1.3 hydrophobic—hydrophobic, adj—having little affinity for water, nonwettable.
3.1.3.1 Discussion—
Hydrophobic surfaces exhibit contact angles between a sessile drop of water and the surface appreciably greater than zero.
3.1.3.1 Discussion—
Hydrophobic surfaces exhibit contact angles between a sessile drop of water and
...
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