ASTM D6990-20
(Practice)Standard Practice for Evaluating Biofouling Resistance and Physical Performance of Marine Coating Systems
Standard Practice for Evaluating Biofouling Resistance and Physical Performance of Marine Coating Systems
SIGNIFICANCE AND USE
5.1 This practice is designed to provide guidance to a panel inspector for quantitative and consistent evaluation of coating performance from test panels coated with marine antifouling coating systems. The practice assesses performance of coating systems based on both antifouling and physical properties.
5.2 The user is cautioned that the results are representative for the specific region and time of year in which the specimens are immersed. It shall be noted that interpretation of results will depend on the geographical location where the test is conducted, whether the coated specimens are exposed either totally or partially immersed, under static or dynamic conditions, and position and orientation.
5.3 Simultaneous testing of a proven standard antifouling coating system (known to minimize fouling accumulation, for example, containing biocide or active agent(s) to prevent fouling settlement/growth) in the specific marine environment shall be included as a reference to assist in interpretation of results. In addition, a negative control (inert surface susceptible to heavy fouling) shall be included on a regular basis. For the exposure to be valid, the surface of the negative control should show heavy fouling relative to the standard system(s).
5.4 Marine coating systems that produce positive results relevant to the standard system(s) show potential for use in protecting underwater marine structures.
5.5 The format can be utilized independent of exposure protocol and coating type, and provides the end user with a consistent practice and format for reporting of performance rating.
SCOPE
1.1 This practice establishes a practice for evaluating degree of biofouling settlement on and physical performance of marine coating systems when panels coated with such coating systems are subjected to immersion conditions in a marine environment. Guidance for preparation or exposure and handling of test specimens can be found in related ASTM standards as noted below (see Section 2).
1.2 This practice and related exposure methodologies are designed as tools for the relative assessment of coating performance, and in no way are to be used as an absolute indicator of long-term performance under all conditions and in all environments. There can be high variability among and within exposure sites with respect to water quality and population or species of fouling organisms, and coating performance may vary with these and other properties.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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. A specific hazard statement is given in Section 6.
1.5 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: D6990 − 20
Standard Practice for
Evaluating Biofouling Resistance and Physical Performance
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of Marine Coating Systems
This standard is issued under the fixed designation D6990; 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.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 Thispracticeestablishesapracticeforevaluatingdegree
of biofouling settlement on and physical performance of RecommendedASTM Methods and Practices for evaluation
of antifouling coatings via panel exposure under a variety of
marine coating systems when panels coated with such coating
systems are subjected to immersion conditions in a marine exposure conditions:
D3623 Test Method for Testing Antifouling Panels in Shal-
environment. Guidance for preparation or exposure and han-
dling of test specimens can be found in related ASTM low Submergence
D4938 Test Method for Erosion Testing of Antifouling
standards as noted below (see Section 2).
Paints Using High Velocity Water
1.2 This practice and related exposure methodologies are
D4939 TestMethodforSubjectingMarineAntifoulingCoat-
designed as tools for the relative assessment of coating
ing to Biofouling and Fluid Shear Forces in Natural
performance, and in no way are to be used as an absolute
Seawater
indicator of long-term performance under all conditions and in
D5479 Practice for Testing Biofouling Resistance of Marine
all environments. There can be high variability among and
Coatings Partially Immersed
within exposure sites with respect to water quality and popu-
D5618 Test Method for Measurement of BarnacleAdhesion
lation or species of fouling organisms, and coating perfor-
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Strength in Shear (Withdrawn 2020)
mance may vary with these and other properties.
G141 Guide for Addressing Variability in Exposure Testing
1.3 The values stated in SI units are to be regarded as the
of Nonmetallic Materials
standard. The values given in parentheses are for information
only.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.1.1 biofilm, n—matrix-enclosed populations of microor-
responsibility of the user of this standard to establish appro-
ganisms adherent to each other or to surfaces, or both, or
priate safety, health, and environmental practices and deter-
interfaces.
mine the applicability of regulatory limitations prior to use. A
3.1.2 biofouling adhesion, n—qualitative or quantitative
specific hazard statement is given in Section 6.
force required for the successful and complete removal of
1.5 This international standard was developed in accor-
marine fouling attached to the antifouling coating surface (for
dance with internationally recognized principles on standard-
example, reference Test Method D5618 for barnacles).
ization established in the Decision on Principles for the
3.1.3 corrosion eruptions, n—build up of oxides, exiting
Development of International Standards, Guides and Recom-
through protective paint film.
mendations issued by the World Trade Organization Technical
3.1.4 damage, n—limited destruction of portions of paint
Barriers to Trade (TBT) Committee.
film due to impact with a foreign article.
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This practice is under the jurisdiction of ASTM Committee D01 on Paint and
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Related Coatings, Materials, and Applications and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee D01.45 on Marine Coatings. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Sept. 1, 2020. Published September 2020. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 2003. Last previous edition approved in 2011 as D6990 – 05 (2011) the ASTM website.
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which was withdrawn in January 2020 and reinstated in September 2020. DOI: The last approved version of this historical standard is referenced on
10.1520/D6990-20. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6990 − 20
3.1.5 digging, n—a term used to describe hard fouling exposure to be valid, the surface of the negative control should
macroorganisms that are growing “into” the coating. That is, show heavy fouling relative to the standard sy
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