ASTM F1645/F1645M-07

Standard Test Method for Water Migration in Honeycomb Core Materials

SIGNIFICANCE AND USE
Water permeability is a fundamental physical property that can be used in conjunction with other properties to characterize honeycomb sandwich core materials. Migration testing can be used to characterize and compare the relative permeability of honeycomb core materials to water.
This test method provides a standard method of characterizing the rate of water migration within honeycomb sandwich core materials for design properties, material specifications, research and development applications, and quality assurance.
Factors that influence water migration rate characteristics of honeycomb sandwich core materials and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (cell size), core thickness, core thickness uniformity, cell wall thickness, specimen geometry, specimen preparation, specimen conditioning, facing material, facing permeability, adhesive permeability, adhesive thickness, and methods of mass, volume, and water column height measurement.
SCOPE
1.1 This test method covers the determination of water migration in honeycomb core materials.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 91.100.99 - Other construction materials
• Technical Committee: D30 - Composite Materials
• Drafting Committee: D30.09 - Sandwich Construction

Relations

• Replaces: ASTM F1645-00(2005) - Standard Test Method for Water Migration in Honeycomb Core Materials
• Effective Date: 01-Oct-2005
• Replaced By: ASTM F1645/F1645M-12 - Standard Test Method for Water Migration in Honeycomb Core Materials
• Effective Date: 01-Apr-2012
• Referred By: ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
• Effective Date: 01-Oct-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1645/F1645M–07
Standard Test Method for
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Water Migration in Honeycomb Core Materials
ThisstandardisissuedunderthefixeddesignationF1645/F1645M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 E1434 Guide for Recording Mechanical Test Data of Fiber-
Reinforced Composite Materials in Databases
1.1 This test method covers the determination of water
migration in honeycomb core materials.
3. Terminology
1.2 The values stated in either SI units or inch-pound units
3.1 Definitions—Terminology D3878 defines terms relating
are to be regarded separately as standard. Within the text the
to high-modulus fibers and their composites. Terminology
inch-pound units are shown in brackets. The values stated in
C274 defines terms relating to structural sandwich construc-
each system are not exact equivalents; therefore, each system
tions. Terminology D883 defines terms relating to plastics.
must be used independently of the other. Combining values
Terminology E456 and Practice E177 define terms relating to
from the two systems may result in nonconformance with the
statistics.Intheeventofaconflictbetweenterms,Terminology
standard.
D3878 shall have precedence over the other terminologies.
1.3 This standard does not purport to address all of the
3.2 Symbols:
safety concerns, if any, associated with its use. It is the
CV = coefficient of variation statistic of a sample population
responsibility of the user of this standard to establish appro-
for a given property (in percent)
priate safety and health practices and determine the applica-
S = standard deviation statistic of a sample population for
n-1
bility of regulatory limitations prior to use.
a given property
2. Referenced Documents x = test result for an individual specimen from the sample
1
2
population for a given property
2.1 ASTM Standards:
x = mean or average (estimate of mean) of a sample
C271/C271M Test Method for Density of Sandwich Core
population for a given property
Materials
V = volume of water necessary to fill one core cell
c
C274 Terminology of Structural Sandwich Constructions
V = volume of water transfused
D883 Terminology Relating to Plastics f
W = mass of specimen after filling the primary cell with
c
D3878 Terminology for Composite Materials
water
D5229/D5229M Test Method for Moisture Absorption
W = mass of specimen after water transfusion
f
Properties and Equilibrium Conditioning of Polymer Ma-
W = mass of specimen after conditioning, prior to water
trix Composite Materials i
introduction
E122 Practice for Calculating Sample Size to Estimate,
With Specified Precision, the Average for a Characteristic
4. Summary of Test Method
of a Lot or Process
4.1 This test method consists of bonding a honeycomb core
E177 Practice for Use of the Terms Precision and Bias in
materialtotransparentfacingsusingawater-resistantadhesive,
ASTM Test Methods
drilling an access hole through one facing to an individual core
E456 Terminology Relating to Quality and Statistics
cell, filling the cell with water, subjecting the filled cell to a
E1309 Guide for Identification of Fiber-Reinforced
constant hydrostatic pressure by maintaining a specified water
Polymer-Matrix Composite Materials in Databases
column height, then measuring the amount of water transferred
into the honeycomb core specimen (primarily due to diffusion
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This test method is under the jurisdiction of ASTM Committee D30 on
through the cell walls) within a 24-h period. The amount of
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
water transferred is presented as an approximate number of
Sandwich Construction.
honeycomb core cells filled with water.
Current edition approved May 1, 2007. Published June 2007. Originally
approved in 1995. Last previous edition approved in 2005 as F1645 – 00 (2005).
5. Significance and Use
DOI: 10.1520/F1645_F1645M-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Water permeability is a fundamental physical property
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
that can be used in conjunction with other properties to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. characterize honeycomb sandwich core materials. Migration
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F1645/F1645M–07
testing can be used to characterize and compare the relative 7.3 Syringe—If the amount of water transferred into the
permeability of ho
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