ASTM C272/C272M-18
(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
5.1 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.
5.2 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.
5.3 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, 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.
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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: C272/C272M − 18
Standard Test 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 U.S. Department of Defense.
1. Scope D1193Specification for Reagent Water
D3878Terminology for Composite Materials
1.1 Thistestmethodcoversthedeterminationoftherelative
E122PracticeforCalculatingSampleSizetoEstimate,With
amount of water absorption by various types of sandwich
Specified Precision, the Average for a Characteristic of a
construction core materials when immersed in water, or when
Lot or Process
subjected to a high relative humidity environment. Permissible
E177Practice for Use of the Terms Precision and Bias in
core material forms include those with continuous bonding
ASTM Test Methods
surfaces (such as balsa wood and foams) as well as those with
E456Terminology Relating to Quality and Statistics
discontinuous bonding surfaces (such as honeycomb).
1.2 The values stated in either SI units or inch-pound units
3. Terminology
are to be regarded separately as standard. The values stated in
3.1 Definitions—Terminology D3878 defines terms relating
each system may not be exact equivalents; therefore, each
to high-modulus fibers and their composites, as well as terms
system shall be used independently of the other. Combining
relating to sandwich constructions. Terminology D883 defines
values from the two systems may result in non-conformance
termsrelatingtoplastics.TerminologyE456andPracticeE177
with the standard.
define terms relating to statistics. In the event of a conflict
1.2.1 Within the text the inch-pound units are shown in
between terms, Terminology D3878 shall have precedence
brackets.
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
3.2.1 CV—coefficient of variation statistic of a sample
responsibility of the user of this standard to establish appro-
population for a given property (in percent).
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.2.2 D—pre-immersion mass of a test specimen.
1.4 This international standard was developed in accor-
3.2.3 h—height of a test specimen.
dance with internationally recognized principles on standard-
3.2.4 l—length of a test specimen.
ization established in the Decision on Principles for the
3.2.5 S —standard deviation statistic of a sample popula-
Development of International Standards, Guides and Recom-
n–1
tion for a given property.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.2.6 x —test result for an individual specimen from the
1
sample population for a given property.
2. Referenced Documents
3.2.7 x—mean or average (estimate of mean) of a sample
2
2.1 ASTM Standards:
population for a given property.
D883Terminology Relating to Plastics
3.2.8 V—volume of a test specimen.
3.2.9 w—width of a test specimen.
1
This test method is under the jurisdiction of ASTM Committee D30 on
3.2.10 W—mass of a test specimen.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
Current edition approved Aug. 1, 2018. Published August 2018. Originally
4. Summary of Test Method
approved in 1951. Last previous edition approved in 2016 as C272–16. DOI:
10.1520/C0272_C0272M-18.
4.1 This test method consists of exposing sandwich core
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specimen to a defined moisture condition, and determining the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
amount of water absorbed by measuring the mass increase in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the specimen.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C272/C272M − 18
5. Significance and Use with an accuracy of 65 % and a uniform temperature with an
accuracy of 63°C [65°F].
5.1 Absorbed water affects the characteristic properties of
sandwich core materials, such as electrical properties (for 7.5 The water used in this test method
...
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: C272/C272M − 16 C272/C272M − 18
Standard Test 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. 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 U.S. Department of Defense.
1. 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 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:
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water
D3878 Terminology for 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 to 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:
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.
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, 2016Aug. 1, 2018. Published April 2016August 2018. Originally approved in 1951. Last previous edition approved in 20122016 as
C272 – 12.C272 – 16. DOI: 10.1520/C0272_C0272M-16.10.1520/C0272_C0272M-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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 − 18
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 property.
n–1
3.2.6 x —test result for an individual specimen from the sample population for a given property.
1
3.2.7 x—mean or average (estimate of mean) of a sample population for a given property.
3.2.8 V—volume of a test specimen.
3.2.9 w—width of a test specimen.
3.2.10 W—mass of a test specimen.
4. Summary of Test Method
4.1 This test method consists of exposing sandwich core specimen to a defined moisture condition, and determining the amount
of water absorbed by measuring the mass increase in the specimen.
5. Significance and Use
5.1 Absor
...
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