ASTM C481-99(2011)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C481 − 99(Reapproved 2011)
Standard Test Method for
Laboratory Aging of Sandwich Constructions
This standard is issued under the fixed designation C481; 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 D1781Test Method for Climbing Drum Peel for Adhesives
1.1 This test method covers the determination of the resis-
3. Significance and Use
tance of sandwich panels to severe exposure conditions as
3.1 Most sandwich panels are subjected to various tempera-
measured by the change in selected properties of the material
ture and humidity environments. This laboratory aging test
after exposure. The exposure cycle to which the specimen is
determines the selected panel property degradation under
subjected is an arbitrary test having no correlation with natural
simulated conditions.
weathering conditions.
3.2 These test methods provide a standard method of
1.2 The values stated in SI units are to be regarded as
obtainingsimulatedenvironmentaldegradationdataforquality
standard. No other units of measurement are included in this
control, acceptance specification testing, and research and
standard.
development; however, these laboratory aging test procedures
1.2.1 Exception—The inch-pound units are provided for
donothaveanycorrelationwithnaturalweatheringconditions.
information only.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
4.1 Water tank, steam sprayer, oven, and freezer, all capable
responsibility of the user of this standard to establish appro-
of maintaining the required environment.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4.2 Test apparatus, shall conform to the appropriateASTM
Test Method listed in Section 2.
2. Referenced Documents
2 5. Test Specimens
2.1 ASTM Standards:
C273Test Method for Shear Properties of Sandwich Core 5.1 The test specimens shall conform to the appropriate
Materials ASTM Test Method listed in Section 2.
C297/C297MTest Method for Flatwise Tensile Strength of
6. Aging Test Procedures
Sandwich Constructions
C363TestMethodforDelaminationStrengthofHoneycomb
6.1 Subject each specimen to six complete cycles of labo-
Core Materials
ratory aging, using either Cycle A (more severe) or Cycle B
C364Test Method for Edgewise Compressive Strength of
(milder). The time interval between cycles shall not exceed 30
Sandwich Constructions
min.
C365/C365MTest Method for Flatwise Compressive Prop-
6.2 Cycle A:
erties of Sandwich Cores
6.2.1 Totally immerse the specimen horizontally in water at
C393Test Method for Flexural Properties of Sandwich
50 6 2°C (120 6 3°F) for 1 h.
Constructions
6.2.2 Spraywithsteamandwatervaporat95 63°C(200 6
5°F) for 3 h.
6.2.3 Store at−12 6 3°C (10 6 5°F) for 20 h.
This specification is under the jurisdiction of ASTM Committee D30 on
6.2.4 Heat at 100 6 2°C (210 6 3°F) in dry air for 3 h.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
6.2.5 Spray again with steam and water vapor at 95 6 3°C
Current edition approved Aug. 1, 2011. Published December 2011. Originally
(200 6 5°F) for 3 h.
approved in 1961. Last previous edition approved in 2005 as C481–99 (2005).
6.2.6 Heat in dry air at 100 6 2°C (210 6 3°F) for 18 h.
DOI: 10.1520/C0481-99R11.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3 Cycle B:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3.1 Totally immerse the specimen horizontally in water at
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 50 6 3°C (120 6 5°F) for 1 h.
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