ASTM D5618-94(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D5618–94 (Reapproved 2000)
Standard Test Method for
Measurement of Barnacle Adhesion Strength in Shear
This standard is issued under the fixed designation D 5618; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the measurement of barnacle 4.1 This test method is designed as a screening test in the
adhesion in shear to surfaces exposed in the marine environ- evaluation of coating systems and other materials designed to
ment. It is used to establish the ability of a surface to reduce resist biofouling attachment.
biofouling adhesion. Surfaces with known barnacle adhesion 4.2 The degree and type of barnacle fouling will vary
strengths are included to serve as controls. according to the geographic location of test sites and the time
1.2 The values stated in SI units are to be regarded as the of year when tests are implemented. Surfaces with known
standard. The values given in parentheses are for information barnacle adhesive shear strength should be exposed to provide
only. comparative data.
1.3 This standard does not purport to address all of the
5. Interferences
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.1 Variations in barnacle adhesion strength may occur due
to differences in species, age, and physical condition.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.2 Incomplete removal of the barnacle base plate from the
surface during testing may lead to erroneous adhesion values.
2. Referenced Documents
5.3 Care must be taken not to dislodge the barnacle during
2.1 ASTM Standards: base diameter measurements.
D 3623 Test Method for Testing Antifouling Panels in
6. Apparatus
Shallow Submergence
6.1 Hand-Held Probe, used to apply force to the barnacle
2.2 U.S. Military Specifications:
MIL-P-24441/1 Primer, Epoxy (Formula 150, Formula base. It is recommended that a 14- by 14-mm stainless steel
Sheet 24441/1) plate be attached to the end of a 8-mm diameter stainless steel
rod that is attached to a force measuring device (see Fig. 1).
3. Summary of Test Method
6.2 Force Measuring Device, maybe a spring scale or force
3.1 Test surfaces and coatings are immersed in the marine transducer.
environment according to TestMethod D 3623. When bar- 6.2.1 The force measuring device should be capable of
nacles are observed to have settled on the surface, the strength recordingvaluesbetween0to150N(0to34lb)toanaccuracy
of adhesion of individuals is measured. Barnacle adhesive of 60.5N(60.1125 lb).
shearstrengthiscalculatedbydividingtheshearforcerequired
7. Procedure
to remove the barnacle by the surface area of the barnacle base
plate. This test method is most suited to small barnacles 7.1 Test and control surfaces are immersed in the marine
environment according to Test Method D 3623. Control sur-
(generally with base diameters between 5 to 20 mm).
3.2 The diameter of the barnacle base is measured and an faces should include polytetrafluoroethylene and MIL-P-24441
primer epoxy.
increasing shear force is applied to the base of the barnacle
until it is removed from the surface. 7.2 Barnacles between 5 to 20 mm in diameter are selected
for testing and identified with regard to species and condition.
Test only barnacles that are at least 20 mm from the edges of
This test method is under the jurisdiction of ASTM Committee D01 on Paint
the test panel and not in direct contact with other barnacles.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.45 on Marine Coatings.
Current edition approved Oct. 15, 1994. Published December 1994.
2 4
Annual Book of ASTM Standards, Vol 06.02. Swain, G. W. J., Griffith, J., Bultman, D., and Vincent, H.,“ BarnacleAdh
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