ASTM C272/C272M-12
(Test Method)Standard Test Method for Water Absorption of Core Materials for Sandwich Constructions
Standard Test Method for Water Absorption of Core Materials for Sandwich Constructions
SIGNIFICANCE AND USE
Absorbed water affects the characteristic properties of sandwich core materials, such as electrical properties (for example, dielectric constant, loss tangent, and electrical resistance) and mechanical properties (for example, strength and modulus). The mass of absorbed water may also affect the behavior of sandwich structures. It should be noted that in a sandwich panel the presence of facings bonded on two sides of the core may affect the amount of water absorbed by the core.
This test method provides a standard method of obtaining sandwich core moisture absorption data for design properties, material specifications, research and development applications, and quality assurance.
Factors that influence the water absorption and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (honeycomb cell size, honeycomb cell wall thickness, foam pore size, etc.), specimen geometry, specimen preparation, methods of mass and dimensional measurement, specimen conditioning, and moisture content during mass and dimensional measurements.
SCOPE
1.1 This test method covers the determination of the relative amount of water absorption by various types of sandwich construction core materials when immersed in water, or when subjected to a high relative humidity environment. Permissible core material forms include those with continuous bonding surfaces (such as balsa wood and foams) as well as those with discontinuous bonding surfaces (such as honeycomb).
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C272/C272M − 12
StandardTest Method for
Water Absorption of Core Materials for Sandwich
1
Constructions
This standard is issued under the fixed designation C272/C272M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope E122PracticeforCalculatingSampleSizetoEstimate,With
Specified Precision, the Average for a Characteristic of a
1.1 Thistestmethodcoversthedeterminationoftherelative
Lot or Process
amount of water absorption by various types of sandwich
E177Practice for Use of the Terms Precision and Bias in
construction core materials when immersed in water, or when
ASTM Test Methods
subjected to a high relative humidity environment. Permissible
E456Terminology Relating to Quality and Statistics
core material forms include those with continuous bonding
surfaces (such as balsa wood and foams) as well as those with
3. Terminology
discontinuous bonding surfaces (such as honeycomb).
D3878 defines terms relating
3.1 Definitions—Terminology
1.2 The values stated in either SI units or inch-pound units
to high-modulus fibers and their composites. Terminology
are to be regarded separately as standard. The values stated in
C274 defines terms relating to structural sandwich construc-
each system may not be exact equivalents; therefore, each
tions. Terminology D883 defines terms relating to plastics.
system shall be used independently of the other. Combining
Terminology E456 and Practice E177 define terms relating to
values from the two systems may result in non-conformance
statistics.Intheeventofaconflictbetweenterms,Terminology
with the standard.
D3878 shall have precedence over the other terminologies.
1.2.1 Within the text the inch-pound units are shown in
3.2 Symbols:
brackets.
3.2.1 CV—coefficient of variation statistic of a sample
1.3 This standard does not purport to address all of the
population for a given property (in percent).
safety concerns, if any, associated with its use. It is the
3.2.2 D—pre-immersion mass of a test specimen.
responsibility of the user of this standard to establish appro-
3.2.3 h—height of a test specimen.
priate safety and health practices and determine the applica-
3.2.4 l—length of a test specimen.
bility of regulatory limitations prior to use.
3.2.5 S —standard deviation statistic of a sample popula-
n–1
2. Referenced Documents
tion for a given property.
2
2.1 ASTM Standards:
3.2.6 x —test result for an individual specimen from the
1
C274Terminology of Structural Sandwich Constructions
sample population for a given property.
D883Terminology Relating to Plastics
3.2.7 x—mean or average (estimate of mean) of a sample
D1193Specification for Reagent Water
population for a given property.
D3878Terminology for Composite Materials
3.2.8 V—volume of a test specimen.
D5229/D5229MTestMethodforMoistureAbsorptionProp-
3.2.9 w—width of a test specimen.
erties and Equilibrium Conditioning of Polymer Matrix
Composite Materials 3.2.10 W—mass of a test specimen.
4. Summary of Test Method
1
This test method is under the jurisdiction of ASTM Committee D30 on
4.1 This test method consists of exposing sandwich core
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
specimen to a defined moisture condition, and determining the
Sandwich Construction.
amount of water absorbed by measuring the mass increase in
Current edition approved April 1, 2012. Published May 2012. Originally
approved in 1951. Last previous edition approved in 2007 as C272–01 (2007).
the specimen.
DOI: 10.1520/C0272_C0272M-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5. Significance and Use
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 Absorbed water affects the characteristic properties of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sandwich core materials, such as electrical properties (for
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C272/C272M − 12
example, dielectric constant, loss tangent, and electrical resis- 7.5 The water used in this test method shall be distilled
tance) and mechanical properties (for example, strength and water (Specification D1193, Type IV reagent water) or deion-
modulus). The mass of absorbed water may also affect the ized water.
behavior of sandwich structures. It should be noted that in a
8. Sampling and Test Specimens
sandwichpanelthepr
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:C272–01(Reapproved2007) Designation:C272/C272M–12
Standard Test Method for
Water Absorption of Core Materials for Structural Sandwich
1
Constructions
This standard is issued under the fixed designation C272/C272M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1This test method covers the determination of the relative amount of water absorption by various types of structural core
materials when immersed or in a high relative humidity environment. This test method is intended to apply to only structural core
materials; honeycomb, foam, and balsa wood.
1.2The values stated in SI units are to be regarded as the standard. The inch-pound units given may be approximate.
1.1 This test method covers the determination of the relative amount of water absorption by various types of sandwich
construction core materials when immersed in water, or when subjected to a high relative humidity environment. Permissible core
materialformsincludethosewithcontinuousbondingsurfaces(suchasbalsawoodandfoams)aswellasthosewithdiscontinuous
bonding surfaces (such as honeycomb).
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
2
C271/C271MTest Method for Density of Sandwich Core Materials ASTM Standards:
C274 Terminology of Structural Sandwich Constructions
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water Specification for Reagent Water
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for MoistureAbsorption 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 —Terminology D3878 defines terms relating to high-modulus fibers and their composites.
Terminology C274 defines terms relating to sandwich constructions. defines terms relating 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.
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 Jan. 1, 2007. Published January 2007. Originally approved in 1951. Last previous edition approved in 2001 as C272–01. DOI:
10.1520/C0272-01R07.
Current edition approved April 1, 2012. Published May 2012. Originally approved in 1951. Last previous edition approved in 2007 as C272 – 01 (2007). DOI:
10.1520/C0272_C0272M-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. 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 ----------------------
C272/C272M–12
3.2 Symbols:
3.2.1 CV—coefficient of variation statistic of a sample population for a given property (in percent).
3.2.2 D—pre-immersion mass of a test specimen.
3.2.3 h—height of a test specimen.
3.2.4 l—length of a test specimen.
3.2.5 S —standard deviation statistic of a sample population for a given prope
...
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