ASTM C481-99(2016)

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: C481 − 99 (Reapproved 2016)
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.
1. Scope 3. Significance and Use
1.1 This test method covers the determination of the resis- 3.1 Most sandwich panels are subjected to various tempera-
tance of sandwich panels to severe exposure conditions as ture and humidity environments. This laboratory aging test
measured by the change in selected properties of the material determines the selected panel property degradation under
after exposure. The exposure cycle to which the specimen is simulated conditions.
subjected is an arbitrary test having no correlation with natural
3.2 These test methods provide a standard method of
weathering conditions.
obtainingsimulatedenvironmentaldegradationdataforquality
1.2 The values stated in SI units are to be regarded as control, acceptance specification testing, and research and
standard. No other units of measurement are included in this development; however, these laboratory aging test procedures
standard. donothaveanycorrelationwithnaturalweatheringconditions.
1.2.1 Exception—The inch-pound units are provided for
4. Apparatus
information only.
4.1 Water tank, steam sprayer, oven, and freezer, all capable
1.3 This standard does not purport to address all of the
of maintaining the required environment.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.2 Test apparatus, shall conform to the appropriateASTM
priate safety and health practices and determine the applica-
Test Method listed in Section 2.
bility of regulatory limitations prior to use.
5. Test Specimens
2. Referenced Documents
5.1 The test specimens shall conform to the appropriate
2.1 ASTM Standards:
ASTM Test Method listed in Section 2.
C273Test Method for Shear Properties of Sandwich Core
Materials
6. Aging Test Procedures
C297/C297MTest Method for Flatwise Tensile Strength of
6.1 Subject each specimen to six complete cycles of labo-
Sandwich Constructions
ratory aging, using either Cycle A (more severe) or Cycle B
C363Test Method for NodeTensile Strength of Honeycomb
(milder). The time interval between cycles shall not exceed 30
Core Materials
min.
C364Test Method for Edgewise Compressive Strength of
6.2 Cycle A:
Sandwich Constructions
6.2.1 Totally immerse the specimen horizontally in water at
C365/C365MTest Method for Flatwise Compressive Prop-
50 6 2°C (120 6 3°F) for 1 h.
erties of Sandwich Cores
6.2.2 Spraywithsteamandwatervaporat95 63°C(200 6
C393Test Method for Core Shear Properties of Sandwich
5°F) for 3 h.
Constructions by Beam Flexure
6.2.3 Store at−12 6 3°C (10 6 5°F) for 20 h.
D1781Test Method for Climbing Drum Peel for Adhesives
6.2.4 Heat at 100 6 2°C (210 6 3°F) in dry air for 3 h.
6.2.5 Spray again with steam and water vapor at 95 6 3°C
(200 6 5°F) for 3 h.
This specification is under the jurisdiction of ASTM Committee D30 on
6.2.6 Heat in dry air at 100 6 2°C (210 6 3°F) for 18 h.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
6.3 Cycle B:
Current edition approved Sept. 15, 2016. Published October 2016. Originally
6.3.1 Totally immerse the specimen horizontally in water at
approved in 1961. Last previous edition approved in 2011 as C481–99 (2011).
DOI: 10.1520/C0481-99R16.
50 6 3°C (120 6 5°F) for 1 h.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3.2 Heat in dry air at 70 6 3°C (160 6 5°F) for 3 h.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3.3 Spray with hot water at 70 6 3°C (160 6 5°F) for 3
Standards volume information, refer to
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