ASTM F520-16

Standard Test Method for Environmental Resistance of Aerospace Transparencies to Artificially Induced Exposures

SIGNIFICANCE AND USE
4.1 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 applies to on configurations employing electrically conductive coatings, and also to uncoated materials.  
4.2 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3.1 Exceptions—Certain inch-pound units are furnished in parentheses (not mandatory) and certain temperatures in Fahrenheit associated with other standards are also furnished.  
1.4 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

• Status: Historical
• Publication Date: 31-Mar-2016
• ICS: 49.045 - Structure and structure elements
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.08 - Transparent Enclosures and Materials

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −16
Standard Test Method for
Environmental Resistance of Aerospace Transparencies to
1
Artificially Induced Exposures
ThisstandardisissuedunderthefixeddesignationF520;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Lamp Apparatus for Exposure of Nonmetallic Materials
1.1 This test method covers determination of the effects of
3. Summary of Test Method
exposure to thermal shock, condensing humidity, and simu-
3.1 Two types of test specimens, duplicating the aerospace
lated weather on aerospace transparent enclosures.
transparent enclosure design, are subjected to thermal shock,
1.2 Thistestmethodisnotrecommendedforqualitycontrol
condensing humidity, and artificial weathering. Edge sealing
nor is it intended to provide a correlation to actual service life.
shall be used if representative of the design.
1.3 The values stated in SI units are to be regarded as
3.1.1 TypeAspecimensshallbeusedtodeterminetheeffect
standard. No other units of measurement are included in this
of environmental exposure on electrical and optical properties.
standard.
3.1.2 TypeBspecimensshallbeusedtodeterminetheeffect
1.3.1 Exceptions—Certaininch-poundunitsarefurnishedin
of environmental exposure on bond integrity.
parentheses (not mandatory) and certain temperatures in Fahr-
enheit associated with other standards are also furnished. 4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 This test method, when applied to aerospace transpar-
safety concerns, if any, associated with its use. It is the
encies of either monolithic glass/plastic or laminated
responsibility of the user of this standard to establish appro-
combinations,isameasureoftheabilityofthetransparencyto
priate safety and health practices and determine the applica-
withstand the effects of artificially induced environments. The
bility of regulatory limitations prior to use. test applies to on configurations employing electrically con-
ductive coatings, and also to uncoated materials.
2. Referenced Documents
4.2 The resistance of the transparent enclosure to environ-
2
2.1 ASTM Standards:
mental effects may vary appreciably depending on the size,
D1003Test Method for Haze and Luminous Transmittance
geometry, material of construction, coating integrity, coating
of Transparent Plastics
density, and other factors.
F319Practice for Polarized Light Detection of Flaws in
Aerospace Transparency Heating Elements
5. Test Specimens
F521Test Methods for Bond Integrity of Transparent Lami-
5.1 Each Type A specimen to be evaluated for external
nates
coating durability shall be a 250 by 250-mm (9.8 by 9.8-in.)
G53Practice for Operating Light-and Water-Exposure Ap-
cross section of the design and shall contain, as applicable,
paratus (Fluorescent UV-Condensation Type) for Expo-
surface coatings of operational, electrically conducting coating
3
sure of Nonmetallic Materials (Withdrawn 2000)
systems complete with bus bars, braids, and temperature
G154Practice for Operating Fluorescent Ultraviolet (UV)
sensors.
5.1.1 Type A test specimens shall have a fully operational
coating system, when applicable, with an average resistivity
1
This test method is under the jurisdiction of ASTM Committee F07 on
consistent with the average resistivity of the representative
Aerospace andAircraft and is the direct responsibility of Subcommittee F07.08 on
Transparent Enclosures and Materials.
design. Reproduction of multiphase electrical circuits is not
Current edition approved April 1, 2016. Published May 2016. Originally
required for these test specimens since this type of circuitry is
approved in 1977. Last previous edition approved in 2010 as F520–10. DOI:
only a design technique used to accommodate limited voltage
10.1520/F0520-16.
2
resources at installation.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.1.2 Type A specimen testing exposure of an external
Standards volume information, refer to the standard’s Document Summary page on
coating only, are independent of size but shall be of sufficient
the ASTM website.
3
size to produce representative coatings. When testing external
The last approved version of this historical standard is referenced on
www.astm.org. coatings the recommended specimen size is 250 by 250-mm
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F520−16
NOTE 1—Paragraphs 7.3 – 7.6 are applicable to systems using electri-
(9.8 by
...

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: F520 − 10 F520 − 16
Standard Test Method for
Environmental Resistance of Aerospace Transparencies to
1
Artificially Induced Exposures
This standard is issued under the fixed designation F520; 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.
1. 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exceptions—Certain inch-pound units are furnished in parentheses (not mandatory) and certain temperatures in Fahrenheit
associated with other standards are also furnished.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1003 Test Method for Haze and Luminous Transmittance of Transparent Plastics
D4329 Practice for Fluorescent Ultraviolet (UV) Lamp Apparatus Exposure of Plastics
F319 Practice for Polarized Light Detection of Flaws in Aerospace Transparency Heating Elements
F521 Test Methods for Bond Integrity of Transparent Laminates
F790 Guide for Testing Materials for Aerospace Plastic Transparent Enclosures
G53 Practice for Operating Light-and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of
3
Nonmetallic Materials (Withdrawn 2000)
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
3. Summary of Test Method
3.1 Two types of test specimens, duplicating the aerospace transparent enclosure design, are subjected to thermal shock,
condensing humidity, and artificial weathering. Edge sealing mayshall be used if representative of the design.
3.1.1 Type A specimens are shall be used to determine the effect of environmental exposure on electrical and optical properties.
3.1.2 Type B specimens are shall be used to determine the effect of environmental exposure on bond integrity.
4. Significance and Use
4.1 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
applies to on configurations employing electrically conductive coatings, and also to evaluate the integrity of noncoated uncoated
materials.
1
This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
Enclosures and Materials.
Current edition approved May 1, 2010April 1, 2016. Published June 2010May 2016. Originally approved in 1977. Last previous edition approved in 20042010 as
F520 – 97 (2004).F520 – 10. DOI: 10.1520/F0520-10.10.1520/F0520-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F520 − 16
4.2 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.
5. Test Specimens
5.1 Each Type A specimen to be evaluated for external coating durability shall be a 250 by 250-mm (9.8 by 9.8-in.) cross section
of the design and shall contain, as applica
...