ASTM C481-99

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Designation:C481–99
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 (e) 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 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 the control, acceptance specification testing, and research and
standard. The inch-pound units given may be approximate. development; however, these laboratory aging test procedures
1.3 This standard does not purport to address all of the donothaveanycorrelationwithnaturalweatheringconditions.
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Water tank, steam sprayer, oven, and freezer,allcapable
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. of maintaining the required environment.
4.2 Test apparatus, shall conform to the appropriateASTM
2. Referenced Documents
Test Method listed in Section 2.
2.1 ASTM Standards:
5. Test Specimens
C273 TestMethodforShearPropertiesinFlatwisePlaneof
Flat Sandwich Constructions or Sandwich Cores 5.1 The test specimens shall conform to the appropriate
C297 Test Method for Tensile Strength of Flat Sandwich ASTM Test Method listed in Section 2.
Constructions in Flatwise Plane
6. Aging Test Procedures
C363 Test Method for Delamination Strength of Honey-
6.1 Subject each specimen to six complete cycles of labo-
comb Type Core Material
ratory aging, using either Cycle A (more severe) or Cycle B
C364 Test Method for Edgewise Compressive Strength of
(milder). The time interval between cycles shall not exceed 30
Flat Sandwich Constructions
min.
C365 Test Methods for Flatwise Compressive Strength of
6.2 Cycle A:
Sandwich Cores
6.2.1 Totally immerse the specimen horizontally in water at
C393 Test Method of Flexural Properties of Flat Sandwich
50 6 2°C (120 6 3°F) for 1 h.
Constructions
6.2.2 Spraywithsteamandwatervaporat95 63°C(200 6
D1781 Test Method for Climbing Drum Peel Test for
5°F) for 3 h.
Adhesives
6.2.3 Store at−12 6 3°C (10 6 5°F) for 20 h.
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
This specification is under the jurisdiction of ASTM Committee D-30 on
(200 6 5°F) for 3 h.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
6.2.6 Heat in dry air at 100 6 2°C (210 6 3°F) for 18 h.
Current edition approved Oct. 10, 1999. Published February 2000. Originally
6.3 Cycle B:
published as C481–61T. Last previous edition C481–62 (1999).
2 6.3.1 Totally immerse the specimen horizontally in water at
Annual Book of ASTM Standards, Vol 15.03.
Annual Book of ASTM Standards, Vol 15.06. 50 6 3°C (120 6 5°F) for 1 h.
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