ASTM E285-08(2020)
(Test Method)Standard Test Method for Oxyacetylene Ablation Testing of Thermal Insulation Materials
Standard Test Method for Oxyacetylene Ablation Testing of Thermal Insulation Materials
SIGNIFICANCE AND USE
4.1 This test method is intended to screen the most obvious poor materials from further consideration. Since the combustion gases more closely resemble the environment generated in rocket motors, this test method is more applicable to screening materials for nozzles and motor liners than for aerodynamic heating.
4.2 The environment for any specific high-temperature thermal protection problem is peculiar to that particular application. The conditions generated by the oxyacetylene heat source in this test method represent only one set of conditions; they do not simulate any specific application. Thus, the test results cannot be used to predict directly the behavior of materials for specific environments, nor can they be used for design purposes. However, over a number of years, the test has been useful in determining the relative merit of materials, particularly in weeding out obviously poor materials from more advanced data-generation programs. It has also been considered for use as a production quality-control test for rocket insulation materials.
4.3 The tester is cautioned to use prudence in extending the usefulness of the test method beyond its original intent, namely, screening. For situations having environments widely different from those of the test, the user is urged to modify the oxyacetylene burner conditions to suit his requirements or perhaps change to a different heat-generating device that provides better simulation.
SCOPE
1.1 This test method covers the screening of ablative materials to determine the relative thermal insulation effectiveness when tested as a flat panel in an environment of a steady flow of hot gas provided by an oxyacetylene burner.
1.2 This test method should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard of materials, products, or assemblies under actual fire conditions. However, results of this test method may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.
1.3 The values stated in SI units are to be regarded as the standard.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
General Information
Standards Content (Sample)
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: E285 − 08 (Reapproved 2020)
Standard Test Method for
Oxyacetylene Ablation Testing of Thermal Insulation
1
Materials
This standard is issued under the fixed designation E285; 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.
3
1. Scope 2.2 Federal Standards:
BB-A-106CAcetylene, Technical, Dissolved
1.1 This test method covers the screening of ablative mate-
BB-O-925AOxygen, Technical, Gas and Liquid
rials to determine the relative thermal insulation effectiveness
when tested as a flat panel in an environment of a steady flow
3. Summary of Test Method
of hot gas provided by an oxyacetylene burner.
3.1 Hot combustion gases are directed along the normal to
1.2 Thistestmethodshouldbeusedtomeasureanddescribe
the specimen until burn-through is achieved. The erosion rate
the properties of materials, products, or assemblies in response
ofthematerialisdeterminedbydividingtheoriginalthickness
to heat and flame under controlled laboratory conditions and
by the time to burn-through. The insulating effectiveness is
should not be used to describe or appraise the fire hazard of
determined from back-face temperature measurements. Insula-
materials, products, or assemblies under actual fire conditions.
tion index numbers are computed by dividing the times for
However, results of this test method may be used as elements
temperature changes of 80, 180, and 380°C, from the initial
of a fire risk assessment which takes into account all of the
ambient temperature, by the original thickness.The insulation-
factors which are pertinent to an assessment of the fire hazard
to-density performance is computed by dividing the insulation
of a particular end use.
index by the density of the panel.
1.3 The values stated in SI units are to be regarded as the
3.2 The general characteristics of the oxyacetylene heat
standard.
source are:
2
1.4 This standard does not purport to address all of the
3.2.1 Heat Flux—835 W/cm (cold-wall calorimeter).
safety concerns, if any, associated with its use. It is the
3.2.2 Velocity—210 m/s (cold, unreacted gases).
responsibility of the user of this standard to establish appro-
3.2.3 Neutral flame conditions.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Significance and Use
1.5 This international standard was developed in accor-
4.1 This test method is intended to screen the most obvious
dance with internationally recognized principles on standard-
poor materials from further consideration. Since the combus-
ization established in the Decision on Principles for the
tiongasesmorecloselyresembletheenvironmentgeneratedin
Development of International Standards, Guides and Recom-
rocket motors, this test method is more applicable to screening
mendations issued by the World Trade Organization Technical
materials for nozzles and motor liners than for aerodynamic
Barriers to Trade (TBT) Committee.
heating.
2. Referenced Documents
4.2 Theenvironmentforanyspecifichigh-temperaturether-
2
mal protection problem is peculiar to that particular applica-
2.1 ASTM Standards:
tion.Theconditionsgeneratedbytheoxyacetyleneheatsource
D792Test Methods for Density and Specific Gravity (Rela-
inthistestmethodrepresentonlyonesetofconditions;theydo
tive Density) of Plastics by Displacement
not simulate any specific application. Thus, the test results
cannot be used to predict directly the behavior of materials for
1
This test method is under the jurisdiction of ASTM Committee E21 on Space
specific environments, nor can they be used for design pur-
Simulation andApplications of SpaceTechnology and is the direct responsibility of
poses. However, over a number of years, the test has been
Subcommittee E21.08 on Thermal Protection.
Current edition approved Nov. 1, 2020. Published December 2020. Originally useful in determining the relative merit of materials, particu-
approvedin1965.Lastpreviouseditionapprovedin2015asE285–08(2015).DOI:
larly in weeding out obviously poor materials from more
10.1520/E0285-08R20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.
Copyright © ASTM Internat
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.