ASTM D5618-94

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5618 – 94
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 resist biofouling attachment.
4.2 The degree and type of barnacle fouling will vary
1.1 This test method covers the measurement of barnacle
according to the geographic location of test sites and the time
adhesion in shear to surfaces exposed in the marine environ-
of year when tests are implemented. Surfaces with known
ment. It is used to establish the ability of a surface to reduce
barnacle adhesive shear strength should be exposed to provide
biofouling adhesion. Surfaces with known barnacle adhesion
comparative data.
strengths are included to serve as controls.
1.2 The values stated in SI units are to be regarded as the
5. Interferences
standard. The values given in parentheses are for information
5.1 Variations in barnacle adhesion strength may occur due
only.
to differences in species, age, and physical condition.
1.3 This standard does not purport to address all of the
5.2 Incomplete removal of the barnacle base plate from the
safety concerns, if any, associated with its use. It is the
surface during testing may lead to erroneous adhesion values.
responsibility of the user of this standard to establish appro-
5.3 Care must be taken not to dislodge the barnacle during
priate safety and health practices and determine the applica-
base diameter measurements.
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
6.1 Hand-Held Probe, used to apply force to the barnacle
2.1 ASTM Standards:
base. It is recommended that a 14- by 14-mm stainless steel
D 3623 Method for Testing Antifouling Panels in Shallow
2 plate be attached to the end of a 8-mm diameter stainless steel
Submergence
rod that is attached to a force measuring device (see Fig. 1).
2.2 U.S. Military Specifications:
6.2 Force Measuring Device, maybe a spring scale or force
MIL-P-24441/1 Primer, Epoxy (Formula 150, Formula
3 transducer.
Sheet 24441/1)
6.2.1 The force measuring device should be capable of
3. Summary of Test Method recording values between 0 to 150 N (0 to 34 lb) to an accuracy
of 60.5N(60.1125 lb).
3.1 Test surfaces and coatings are immersed in the marine
environment according to Method D 3623. When barnacles are
7. Procedure
observed to have settled on the surface, the strength of
7.1 Test and control surfaces are immersed in the marine
adhesion of individuals is measured. Barnacle adhesive shear
environment according to Method D 3623. Control surfaces
strength is calculated by dividing the shear force required to
should include polytetrafluoroethylene and MIL-P-24441
remove the barnacle by the surface area of the barnacle base
primer epoxy.
plate. This test method is most suited to small barnacles
7.2 Barnacles between 5 to 20 mm in diameter are selected
(generally with base diameters between 5 to 20 mm).
for testing and identified with regard to species and condition.
3.2 The diameter of the barnacle base is measured and an
Test only barnacles that are at least 20 mm from the edges of
increasing shear force is applied to the base of the barnacle
the test panel and not in direct contact with other barnacles.
until it is removed from the surface.
7.3 The barnacle base area is estimated from an average
4. Significance and Use base diameter, d . This is obtained by measuring the barnacle
a
base with calipers in four directions (0, 45, 90, 135°). The
4.1 This test method is designed a
...