ASTM E2089-00(2006)
(Practice)Standard Practices for Ground Laboratory Atomic Oxygen Interaction Evaluation of Materials for Space Applications
Standard Practices for Ground Laboratory Atomic Oxygen Interaction Evaluation of Materials for Space Applications
SIGNIFICANCE AND USE
These practices enable the following information to be available:
3.1.1 Material atomic oxygen erosion characteristics.
3.1.2 An atomic oxygen erosion comparison of four well-characterized polymers.
The resulting data are useful to:
3.2.1 Compare the atomic oxygen durability of spacecraft materials exposed to the low Earth orbital environment.
3.2.2 Compare the atomic oxygen erosion behavior between various ground laboratory facilities.
3.2.3 Compare the atomic oxygen erosion behavior between ground laboratory facilities and in-space exposure.
3.2.4 Screen materials being considered for low Earth orbital spacecraft application. However, caution should be exercised in attempting to predict in-space behavior based on ground laboratory testing because of differences in exposure environment and synergistic effects.
SCOPE
1.1 The intent of these practices is to define atomic oxygen exposure procedures that are intended to minimize variability in results within any specific atomic oxygen exposure facility as well as contribute to the understanding of the differences in the response of materials when tested in different facilities.
1.2 These practices are not intended to specify any particular type of atomic oxygen exposure facility but simply specify procedures that can be applied to a wide variety of facilities.
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.
1.3 The values stated in SI units are to be regarded as the standard.
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Designation: E2089 − 00(Reapproved 2006)
Standard Practices for
Ground Laboratory Atomic Oxygen Interaction Evaluation of
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Materials for Space Applications
This standard is issued under the fixed designation E2089; 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 2.1.6 witness materials or samples—materials or samples
used to measure the effective atomic oxygen flux or fluence.
1.1 The intent of these practices is to define atomic oxygen
exposure procedures that are intended to minimize variability 2.2 Symbols:
in results within any specific atomic oxygen exposure facility
2
A = exposed area of the witness sample, cm
k
as well as contribute to the understanding of the differences in
2
A = exposed area of the test sample, cm
s
the response of materials when tested in different facilities.
3
E = in-space erosion yield of the witness material, cm /
k
1.2 These practices are not intended to specify any particu-
atom
3
lar type of atomic oxygen exposure facility but simply specify
E = erosion yield of the test material, cm /atom
s
2
procedures that can be applied to a wide variety of facilities.
f = effective flux, atoms/cm /s
k
2
F = effective fluence, total atoms/cm
k
1.3 The values stated in SI units are to be regarded as the
∆M = mass loss of the witness coupon, g
k
standard.
1.4 This standard does not purport to address all of the 3. Significance and Use
safety concerns, if any, associated with its use. It is the
3.1 These practices enable the following information to be
responsibility of the user of this standard to establish appro-
available:
priate safety and health practices and determine the applica-
3.1.1 Material atomic oxygen erosion characteristics.
bility of regulatory limitations prior to use.
3.1.2 An atomic oxygen erosion comparison of four well-
characterized polymers.
2. Terminology
3.2 The resulting data are useful to:
2.1 Definitions:
3.2.1 Compare the atomic oxygen durability of spacecraft
2.1.1 atomic oxygen erosion yield—thevolumeofamaterial
materials exposed to the low Earth orbital environment.
that is eroded by atomic oxygen per incident oxygen atom
3.2.2 Comparetheatomicoxygenerosionbehaviorbetween
3
reported in cm /atom.
various ground laboratory facilities.
2.1.2 atomic oxygen fluence—the arrival of atomic oxygen
3.2.3 Comparetheatomicoxygenerosionbehaviorbetween
2
to a surface reported in atoms/cm
ground laboratory facilities and in-space exposure.
2.1.3 atomic oxygen flux—the arrival rate of atomic oxygen 3.2.4 Screen materials being considered for low Earth
−2 −1
to a surface reported in atoms·cm ·s .
orbital spacecraft application. However, caution should be
exercised in attempting to predict in-space behavior based on
2.1.4 effective atomic oxygen fluence—the total arrival of
2
ground laboratory testing because of differences in exposure
atomic oxygen to a surface reported in atoms/cm , which
environment and synergistic effects.
would cause the observed amount of erosion if the sample was
exposed in low Earth orbit.
4. Test Specimen
2.1.5 effective atomic oxygen flux—thearrivalrateofatomic
4.1 In addition to the material to be evaluated for atomic
−2 −1
oxygen to a surface reported in atoms·cm ·s , which would
oxygen interaction, the following four standard witness mate-
cause the observed amount of erosion if the sample was
rials should be exposed in the same facility using the same
exposed in low Earth orbit.
operating conditions and duration exposure within a factor of
3, as the test material: Kapton polyimide H or HN, TFE-
1
fluorocarbon fluorinated ethylene propylene (FEP), low-
These practices are under the jurisdiction of ASTM Committee E21 on Space
Simulation and Applications of Space Technology and are the direct responsibility
density polyethylene (PE), and pyrolytic graphite (PG). The
of Subcommittee E21.04 on Space Simulation Test Methods. −2 −1
atomic oxygen effective flux (in atoms·cm ·s ) and effective
Current edition approved April 1, 2006. Published April 2006. Originally
2
fluence (in atoms/cm ) for polyimide Kapton H or HN should
approved in 2000. Last previous edition approved in 2000 as E2089–00. DOI:
10.1520/E2089-00R06. be reported along with the mass or thickness loss relative to
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E2089 − 00 (2006)
polyimide Kapton H or HN for the test material, TFE- atomic oxygen source, it is likely that electromagnetic interac-
fluorocarbon FEP, PE, and PG. For atomic oxygen interaction tions coul
...
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