ASTM C1485-19
(Test Method)Standard Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using an Electric Radiant Heat Energy Source
Standard Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using an Electric Radiant Heat Energy Source
SIGNIFICANCE AND USE
5.1 This test method is designed to provide a basis for estimating one aspect of the fire exposure behavior of exposed insulation installed on the floor of an open attic. The test environment is intended to simulate attic floor exposure to radiant heat conditions. Radiant heat has been observed and defined in full-scale attic experiments.
SCOPE
1.1 This test method covers a procedure for measuring the critical radiant flux of exposed attic floor insulation subjected to a flaming ignition source in a graded radiant heat energy environment inside a test chamber. The test specimen can be any attic floor insulation. This test method is not applicable to those insulations that melt or shrink away when exposed to the radiant heat energy environment or the ignition source.
1.2 This test method measures the critical radiant flux at the farthest point to which the flame advances. It provides a means for relative classification of a fire test response standard for exposed attic floor insulation. The imposed radiant flux simulation levels of thermal radiation are likely to impinge on the surface of exposed attic insulation from roof assemblies heated by the sun and by heat or flames of an incidental fire which has the potential to involve an attic space. This test method is intended to simulate an important element of fire exposure that has the potential to develop in open attics, but is not intended for use in describing flame spread behavior of insulation installed other than on an attic floor.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the material, products, or assemblies under actual fire conditions.
1.5 Warning—Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.
1.6 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.
1.7 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.
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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: C1485 − 19
Standard Test Method for
Critical Radiant Flux of Exposed Attic Floor Insulation Using
1
an Electric Radiant Heat Energy Source
This standard is issued under the fixed designation C1485; 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 priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This test method covers a procedure for measuring the
1.7 This international standard was developed in accor-
critical radiant flux of exposed attic floor insulation subjected
dance with internationally recognized principles on standard-
to a flaming ignition source in a graded radiant heat energy
ization established in the Decision on Principles for the
environment inside a test chamber. The test specimen can be
Development of International Standards, Guides and Recom-
any attic floor insulation. This test method is not applicable to
mendations issued by the World Trade Organization Technical
those insulations that melt or shrink away when exposed to the
Barriers to Trade (TBT) Committee.
radiant heat energy environment or the ignition source.
1.2 This test method measures the critical radiant flux at the
2. Referenced Documents
farthestpointtowhichtheflameadvances.Itprovidesameans
2
2.1 ASTM Standards:
for relative classification of a fire test response standard for
C168Terminology Relating to Thermal Insulation
exposed attic floor insulation. The imposed radiant flux simu-
E691Practice for Conducting an Interlaboratory Study to
lation levels of thermal radiation are likely to impinge on the
Determine the Precision of a Test Method
surfaceofexposedatticinsulationfromroofassembliesheated
bythesunandbyheatorflamesofanincidentalfirewhichhas
2.2 ASTM Adjuncts:
3
the potential to involve an attic space. This test method is
CRF (Critical Radiant Flux) Calibration Form
intended to simulate an important element of fire exposure that
has the potential to develop in open attics, but is not intended
3. Terminology
for use in describing flame spread behavior of insulation
3.1 Definitions:
installed other than on an attic floor.
3.1.1 For definitions of terms used in this specification, see
1.3 The values stated in SI units are to be regarded as
Terminology C168.
standard. The values given in parentheses are for information
3.2 Definitions of Terms Specific to This Standard:
only.
3.2.1 critical radiant flux (CRF)—the level of incident
1.4 This standard is used to measure and describe the
radiant heat energy on the attic floor insulation system at the
responseofmaterials,products,orassembliestoheatandflame 2 2
most distant flame-out point in W/cm. (Btu/ft s).
under controlled conditions, but does not by itself incorporate
3.2.2 flux profile—the curve relating incident radiant heat
all factors required for fire hazard or fire risk assessment of the
energy on the specimen plane to distance from the point of
material, products, or assemblies under actual fire conditions.
initiation of flaming ignition, that is, 0.0 cm. (0.0 in.).
1.5 Warning—Fire testing is inherently hazardous. Ad-
3.2.3 graded radiant energy—the heating element is placed
equate safeguards for personnel and property shall be em-
on an angled plain.
ployed in conducting these tests.
3.2.4 total flux meter—the instrument used to measure the
1.6 This standard does not purport to address all of the
level of radiant heat energy incident on the specimen plane at
safety concerns, if any, associated with its use. It is the
a given point.
responsibility of the user of this standard to establish appro-
1 2
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal For referenced ASTM standards, visit the ASTM website, www.astm.org, or
InsulationandisthedirectresponsibilityofSubcommitteeC16.31onChemicaland contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Physical Properties. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2019. Published April 2019. Originally the ASTM website.
3
approved in 2001. Last previous edition approved in 2013 as C1485–13. DOI: Available from ASTM International Headquarters. Order Adjunct No.
10.1520/C1485-19. ADJC1485. Original adjunct produced in 2006.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
...
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: C1485 − 13 C1485 − 19
Standard Test Method for
Critical Radiant Flux of Exposed Attic Floor Insulation Using
1
an Electric Radiant Heat Energy Source
This standard is issued under the fixed designation C1485; 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 a procedure for measuring the critical radiant flux of exposed attic floor insulation subjected to a
flaming ignition source in a graded radiant heat energy environment inside a test chamber. The test specimen can be any attic floor
insulation. This test method is not applicable to those insulations that melt or shrink away when exposed to the radiant heat energy
environment or the ignition source.
1.2 This test method measures the critical radiant flux at the farthest point to which the flame advances. It provides a means
for relative classification of a fire test response standard for exposed attic floor insulation. The imposed radiant flux simulation
levels of thermal radiation are likely to impinge on the surface of exposed attic insulation from roof assemblies heated by the sun
and by heat or flames of an incidental fire which has the potential to involve an attic space. This test method is intended to simulate
an important element of fire exposure that has the potential to develop in open attics, but is not intended for use in describing flame
spread behavior of insulation installed other than on an attic floor.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under
controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the material,
products, or assemblies under actual fire conditions.
1.5 Warning—Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in
conducting these tests.
1.6 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C168 Terminology Relating to Thermal Insulation
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 ASTM Adjuncts:
3
CRF (Critical Radiant Flux) Calibration Form
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification, see Terminology C168.
1
This test method is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
Physical Properties.
Current edition approved March 1, 2013April 1, 2019. Published March 2013April 2019. Originally approved in 2001. Last previous edition approved in 20062013 as
C1485–06.C1485 – 13. DOI: 10.1520/C1485-13.10.1520/C1485-19.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from ASTM International Headquarters. Order Adjunct No. ADJC1485. Original adjunct produced in 2006.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1485 − 19
3.2 Definitions of Terms Specific to This Standard:
3.2.1 critical radiant flux (CRF)—the level of incident radiant heat energy on the attic floor insulation system at the most distant
2 2
flame-out point in W/cm. (Btu/ft s).
3.2.2 flux profile—the curve relating incident radiant heat energy on the specimen plane to distance from the point of initia
...
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