ASTM D5618-94(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D5618–94(Reapproved2005)
Standard Test Method for
Measurement of Barnacle Adhesion Strength in Shear
This standard is issued under the fixed designation D5618; 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 3.2 The diameter of the barnacle base is measured and an
increasing shear force is applied to the base of the barnacle
1.1 This test method covers the measurement of barnacle
until it is removed from the surface.
adhesion in shear to surfaces exposed in the marine environ-
ment. It is used to establish the ability of a surface to reduce
4. Significance and Use
biofouling adhesion. Surfaces with known barnacle adhesion
4.1 This test method is designed as a screening test in the
strengths are included to serve as controls.
evaluation of coating systems and other materials designed to
1.2 The values stated in SI units are to be regarded as the
resist biofouling attachment.
standard. The values given in parentheses are for information
4.2 The degree and type of barnacle fouling will vary
only.
according to the geographic location of test sites and the time
1.3 This standard does not purport to address all of the
of year when tests are implemented. Surfaces with known
safety concerns, if any, associated with its use. It is the
barnacle adhesive shear strength should be exposed to provide
responsibility of the user of this standard to establish appro-
comparative data.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Interferences
5.1 Variations in barnacle adhesion strength may occur due
2. Referenced Documents
to differences in species, age, and physical condition.
2.1 ASTM Standards:
5.2 Incomplete removal of the barnacle base plate from the
D3623 Test Method for TestingAntifouling Panels in Shal-
surface during testing may lead to erroneous adhesion values.
low Submergence
5.3 Care must be taken not to dislodge the barnacle during
2.2 U.S. Military Specifications:
base diameter measurements.
MIL-P-24441/1 Primer, Epoxy (Formula 150, Formula
Sheet 24441/1)
6. Apparatus
6.1 Hand-Held Probe, used to apply force to the barnacle
3. Summary of Test Method
base. It is recommended that a 14- by 14-mm stainless steel
3.1 Test surfaces and coatings are immersed in the marine
plate be attached to the end of a 8-mm diameter stainless steel
environmentaccordingtoTestMethodD3623.Whenbarnacles
rod that is attached to a force measuring device (see Fig. 1).
are observed to have settled on the surface, the strength of
6.2 Force Measuring Device, maybe a spring scale or force
adhesion of individuals is measured. Barnacle adhesive shear
transducer.
strength is calculated by dividing the shear force required to
6.2.1 The force measuring device should be capable of
remove the barnacle by the surface area of the barnacle base
recordingvaluesbetween0to150N(0to34lb)toanaccuracy
plate. This test method is most suited to small barnacles
of 60.5N(60.1125 lb).
(generally with base diameters between 5 to 20 mm).
7. Procedure
7.1 Test and control surfaces are immersed in the marine
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
environment according to Test Method D3623. Control sur-
Subcommittee D01.45 on Marine Coatings.
faces should include polytetrafluoroethylene and MIL-P-24441
Current edition approved Sept. 1, 2005. Published September 2005. Originally
primer epoxy.
approved in 1994. Last previous edition approved in 2000 as D5618 – 94 (2000).
7.2 Barnacles between 5 to 20 mm in diameter are selected
DOI: 10.1520/D5618-94R05.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
for testing and identified with regard to species and condition.
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. Swain, G. W. J., Griffith, J., Bultman, D.,
...