ASTM F1645-00(2005)
(Test Method)Standard Test Method for Water Migration in Honeycomb Core Materials
Standard Test Method for Water Migration in Honeycomb Core Materials
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1.1 This test method covers the determination of water migration in honeycomb core materials.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given may be approximate.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F1645–00 (Reapproved 2005)
Standard Test Method for
Water Migration in Honeycomb Core Materials
This standard is issued under the fixed designation F 1645; 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 6. Conditioning
1.1 This test method covers the determination of water 6.1 It is recommended that the tests be conducted at 23 6
migration in honeycomb core materials. 3°C (73 6 5°F), 50 6 5 % relative humidity, and the
1.2 The values stated in SI units are to be regarded as the specimens be conditioned to constant weight (61 %) under
standard. The inch-pound units given may be approximate. those conditions before testing.
1.3 This standard does not purport to address all of the
7. Procedure
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 7.1 Determine the density of each specimen per Test
Method C 271, if required.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 7.2 Bond the facings to the core. Clear plastic facings are
recommended as this will make it possible to drill a hole in the
2. Referenced Documents
upper facing over a single cell and observe where the water
2.1 ASTM Standards: migrated. The adhesive shall be applied so that fairly heavy
C 271 Test Method for Density of Sandwich Core Materials fillets form between the core cell walls and the facings, thus
assuring a watertight joint between the facings and core. A
3. Significance and Use
clear adhesive is recommended.
3.1 This test method determines the rate of water migration 7.3 Ahole shall be drilled through the upper facing over one
between honeycomb core cells.
centrally located core cell. The hole must lead into only one
cell.
4. Apparatus
7.4 A suitable connection shall be provided, such as a tube
4.1 Micrometer, Gage, or Caliper, capable of measuring
bonded over the hole, for the application of hydrostatic
accurately to 0.025 mm (0.001 in.).
pressure (see Fig. 1).
4.2 Weighing Scale, capable of measuring accurately to
60.5 %.
4.3 Water Migration Setup, buret, rubber hose, clamps,
stand.
5. Test Specimens
5.1 The test specimens may be any convenient size of core
material as agreed upon by the purchaser and the seller. The
minimum specimen size recommended is 76- by 76-mm (3- by
3-in.) cross section and 12.7 mm (0.5 in.) thick. The facings
shall be of impervious, transparent material to permit visual
observation into the core cells by illumination, and they shall
be bonded to the core with a water-resistant adhesive.
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
FIG. 1 Water Migration Specimen
Sandwich Construction.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
approved in 1995. Last previous edition approved in 2000 as F 1645 – 00.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.5 The primary cell shall be filled with distilled or deion-
contact ASTM Customer Service at serv
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1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
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1.3.2 The procedures used to specify how data are collected/recorded or calculated in this practice are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be measured. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce the significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this practice to consider significant digits used in the analytical methods for engineering design.
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1.2.1 Within the text, the inch-pound units are shown in brackets.
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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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