ASTM F1645/F1645M-22

Standard Test Method for Water Migration in Honeycomb Core Materials

SIGNIFICANCE AND USE
5.1 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.  
5.2 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.  
5.3 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 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.2.1 Within the text, the inch-pound units are shown in brackets.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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.

General Information

• Status: Published
• Publication Date: 30-Apr-2022
• ICS: 91.100.99 - Other construction materials
• Technical Committee: D30 - Composite Materials
• Drafting Committee: D30.09 - Sandwich Construction

Relations

• Refers: ASTM D5229/D5229M-20 - Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
• Effective Date: 01-Mar-2020

Standards Content (Sample)

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.
Designation: F1645/F1645M − 22
Standard Test Method for
1
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 Specified Precision, the Average for a Characteristic of a
Lot or Process
1.1 This test method covers the determination of water
E177 Practice for Use of the Terms Precision and Bias in
migration in honeycomb core materials.
ASTM Test Methods
1.2 Units—The values stated in either SI units or inch-
E456 Terminology Relating to Quality and Statistics
pound units are to be regarded separately as standard. The
values stated in each system are not necessarily exact equiva-
3. Terminology
lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values
3.1 Definitions—Terminology D3878 defines terms relating
from the two systems shall not be combined. to high-modulus fibers and their composites, as well as terms
1.2.1 Within the text, the inch-pound units are shown in
relating to structural sandwich constructions. Terminology
brackets.
D883 defines terms relating to plastics. Terminology E456 and
Practice E177 define terms relating to statistics. In the event of
1.3 This standard does not purport to address all of the
a conflict between terms, Terminology D3878 shall have
safety concerns, if any, associated with its use. It is the
precedence over the other terminologies.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3.2 Symbols:
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
CV = coefficientofvariationstatisticofasamplepopulation
dance with internationally recognized principles on standard-
for a given property (in percent),
ization established in the Decision on Principles for the S = standard deviation statistic of a sample population for
n-1
Development of International Standards, Guides and Recom-
a given property,
x = test result for an individual specimen from the sample
mendations issued by the World Trade Organization Technical
1
Barriers to Trade (TBT) Committee. population for a given property,
x¯ = mean or average (estimate of mean) of a sample
2. Referenced Documents population for a given property,
2 V = volume of water necessary to fill one core cell,
c
2.1 ASTM Standards:
V = volume of water transfused,
f
C271/C271M Test Method for Density of Sandwich Core
W = mass of specimen after filling the primary cell with
c
Materials
water,
D883 Terminology Relating to Plastics
W = mass of specimen after water transfusion, and
f
D3878 Terminology for Composite Materials
W = mass of specimen after conditioning, prior to water
i
D5229/D5229M TestMethodforMoistureAbsorptionProp-
introduction.
erties and Equilibrium Conditioning of Polymer Matrix
Composite Materials
4. Summary of Test Method
E122 Practice for Calculating Sample Size to Estimate,With
4.1 This test method consists of bonding a honeycomb core
material to transparent face sheets using a water-resistant
1
adhesive, drilling an access hole through one facing to an
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
individual core cell, filling the cell with water, subjecting the
Sandwich Construction.
filled cell to a constant hydrostatic pressure by maintaining a
Current edition approved May 1, 2022. Published May 2022. Originally
specified water column height, then measuring the amount of
approved in 1995. Last previous edition approved in 2016 as F1645/F1645M – 16.
DOI: 10.1520/F1645_F1645M-22.
watertransferredintothehoneycombcorespecimen(primarily
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
due to diffusion through the cell walls) within a 24 h period.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Theamountofwatertransferredispresentedasanapproximate
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. number of honeycomb core cells filled with water.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F1645/F1645M − 22
5. Significance and Use measurement, whereas an ins
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F1645/F1645M − 16 F1645/F1645M − 22
Standard Test Method for
1
Water Migration in Honeycomb Core Materials
This standard is issued under the fixed designation F1645/F1645M; 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
1.1 This test method covers the determination of water migration in honeycomb core materials.
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in
each system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.2.1 Within the text, the inch-pound units are shown in brackets.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C271/C271M Test Method for Density of Sandwich Core Materials
D883 Terminology Relating to Plastics
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
Materials
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Process
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to high-modulus fibers and their composites, as well as terms relating
1
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.09 on Sandwich
Construction.
Current edition approved April 1, 2016May 1, 2022. Published May 2016May 2022. Originally approved in 1995. Last previous edition approved in 20122016 as
F1645 – 12.F1645/F1645M – 16. DOI: 10.1520/F1645_F1645M-16. 10.1520/F1645_F1645M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F1645/F1645M − 22
to structural sandwich constructions. Terminology D883 defines terms relating to plastics. Terminology E456 and Practice E177
define terms relating to statistics. In the event of a conflict between terms, Terminology D3878 shall have precedence over the other
terminologies.
3.2 Symbols:
CV = coefficient of variation statistic of a sample population for a given property (in percent),
S = standard deviation statistic of a sample population for a given property,
n-1
x = test result for an individual specimen from the sample population for a given property,
1
x¯ = mean or average (estimate of mean) of a sample population for a given property,
V = volume of water necessary to fill one core cell,
c
V = volume of water transfused,
f
W = mass of specimen after filling the primary cell with water,
c
W = mass of specimen after water transfusion, and
f
W = mass of specimen after conditioning, prior to water introduction.
i
4. Summary of Test Method
4.1 This test method consists of bonding a honeycomb core material to transparent facings face sheets using a water-resistant
adhesive, drilling an access hole through one facing to an individual core cell, filling the cell with water, subjecting the filled cell
to a constant hydrostatic pressure by maintaining a specified water column he
...