ASTM F520-97(2004)
(Test Method)Standard Test Method for Environmental Resistance of Aerospace Transparencies
Standard Test Method for Environmental Resistance of Aerospace Transparencies
SIGNIFICANCE AND USE
This test method, when applied to aerospace transparencies of either monolithic glass/plastic or laminated combinations, is a measure of the ability of the transparency to withstand the effects of artificially induced environments. The test may be used on configurations employing electrically conductive coatings, and also to evaluate the integrity of noncoated materials.
The resistance of the transparent enclosure to environmental effects may vary appreciably depending on the size, geometry, material of construction, coating integrity, coating density, and other factors.
SCOPE
1.1 This test method covers determination of the effects of exposure to thermal shock, condensing humidity, and simulated weather on aerospace transparent enclosures.
1.2 This test method is not recommended for quality control nor is it intended to provide a correlation to actual service life.
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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:F520–97 (Reapproved 2004)
Standard Test Method for
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Environmental Resistance of Aerospace Transparencies
ThisstandardisissuedunderthefixeddesignationF520;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope condensing humidity, and artificial weathering. Edge sealing
may be used if representative of the design.
1.1 This test method covers determination of the effects of
3.1.1 Type A specimens are used to determine the effect of
exposure to thermal shock, condensing humidity, and simu-
environmental exposure on electrical and optical properties.
lated weather on aerospace transparent enclosures.
3.1.2 Type B specimens are used to determine the effect of
1.2 Thistestmethodisnotrecommendedforqualitycontrol
environmental exposure on bond integrity.
nor is it intended to provide a correlation to actual service life.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 This test method, when applied to aerospace transpar-
responsibility of the user of this standard to establish appro-
encies of either monolithic glass/plastic or laminated combi-
priate safety and health practices and determine the applica-
nations, is a measure of the ability of the transparency to
bility of regulatory limitations prior to use.
withstand the effects of artificially induced environments. The
2. Referenced Documents test may be used on configurations employing electrically
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conductive coatings, and also to evaluate the integrity of
2.1 ASTM Standards:
noncoated materials.
D1003 Test Method for Haze and Luminous Transmittance
4.2 The resistance of the transparent enclosure to environ-
of Transparent Plastics
mental effects may vary appreciably depending on the size,
F521 TestMethodsforBondIntegrityofTransparentLami-
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geometry, material of construction, coating integrity, coating
nates
density, and other factors.
G23 Practice for Operating Light-Exposure Apparatus
(Carbon-Arc Type) With and Without Water for Exposure
5. Test Specimens
43
of Nonmetallic Materials (Discontinued 2001)
5.1 Each Type A specimen shall be a 250 by 250-mm (9.8
G26 Practice for Operating Light-Exposure Apparatus
by 9.8-in.) cross section of the design and shall contain, as
(Xenon-Arc Type) With and Without Water for Exposure
43 applicable, surface coatings of operational, electrically con-
of Nonmetallic Materials (Discontinued 2001)
ducting coating systems complete with bus bars, braids, and
G53 Practice for Operating Light-and Water-Exposure Ap-
temperature sensors.
paratus(FluorescentUV-CondensationType)forExposure
4 5.1.1 Type A test specimens shall have a fully operational
of Nonmetallic Materials (Discontinued 2001)
coating system, when applicable, with an average resistivity
3. Summary of Test Method consistent with the average resistivity of the representative
design. Reproduction of multiphase electrical circuits is not
3.1 Two types of test specimens, duplicating the aerospace
required for these test specimens since this type of circuitry is
transparent enclosure design, are subjected to thermal shock,
only a design technique used to accommodate limited voltage
resources at installation.
5.2 Each Type B test specimen shall be 50 by 50 mm (2 by
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This test method is under the jurisdiction of ASTM Committee F07 on
2 in.) and shall be of a cross section consistent with the edge
Aerospace andAircraft and is the direct responsibility of Subcommittee F07.08 on
configuration of the representative design. Type B test speci-
Transparent Enclosures and Materials.
Current edition approved Oct. 1, 2004. Published October 2004. Originally
mens are not intended to be operational electrically, but they
approved in 1977. Last previous edition approved in 1997 as F520–97. DOI:
shall be representative of the average resistivity of the design.
10.1520/F0520-97R04.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Preparation of Test Specimens
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
6.1 Prepare a minimum of three TypeAspecimens for each
the ASTM website.
design configuration. If the design contains an electrically
3
Withdrawn.
4 activated coating, only one temperature sensor per specimen is
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org. required.
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