ASTM D7309-21b
(Test Method)Standard Test Method for Determining Flammability Characteristics of Plastics and Other Solid Materials Using Microscale Combustion Calorimetry
Standard Test Method for Determining Flammability Characteristics of Plastics and Other Solid Materials Using Microscale Combustion Calorimetry
SIGNIFICANCE AND USE
5.1 This laboratory test method measures thermal combustion properties of materials (1-9).4
5.2 The test uses controlled thermal and thermal-oxidative decomposition of specimens and thermal oxidation of the specimen gases as they are released from the specimen to simulate the condensed and gas phase processes of flaming combustion, respectively, in a small-scale laboratory test (1-9).
5.3 The thermal combustion properties measured in the test are related to flammability characteristics of the material (4-9).
5.4 The amount of heat released in flaming combustion per unit mass of material is the fire load and the potential fire load (complete combustion) is estimated in Method A as hc.
5.5 The net calorific value of the material (see Test Method D5865) is determined directly using Method B as hco without the need to know the atomic composition of the specimen to correct for the latent heat of evaporation of the water produced by combustion, or to perform titrations to correct for the heat of solution of acid gases. See Table X1.2 for comparison of Microscale Combustion Calorimetry (MCC) data with Test Method D5865.
5.6 The temperature T5 % of Method A measured at a heating rate β = 1K/s approximates the surface temperature at piloted ignition in accordance with Ref. (8 and 9) for purposes of fire modeling (see Guide E1591).
5.7 The heat release capacity ηc (J/g-K) is a flammability parameter measured in Method A that is unique to this test method.
5.8 The fire growth capacity FGC (J/g-K) is a flammability parameter measured in Method A at heating rate β = 1K/s that is unique to this test method.
SCOPE
1.1 This test method, which is similar to thermal analysis techniques, establishes a procedure for determining flammability characteristics of combustible materials such as plastics.
1.2 The test is conducted in a laboratory environment using controlled heating of milligram specimens and complete thermal oxidation of the specimen gases.
1.3 Specimens of known mass are thermally decomposed in an oxygen-free (anaerobic) or oxidizing (aerobic) environment at a constant heating rate between 0.2 and 2 K/s.
1.4 The heat released by the specimen is determined from the mass of oxygen consumed to completely oxidize (combust) the specimen gases.
1.5 The rate of heat released by combustion of the specimen gases produced during controlled thermal or thermoxidative decomposition of the specimen is computed from the rate of oxygen consumption.
1.6 The specimen temperatures over which combustion heat is released are measured.
1.7 The mass of specimen remaining after the test is measured and used to compute the residual mass fraction.
1.8 The specimen shall be a material or composite material in any form (fiber, film, powder, pellet, droplet). This test method has been developed to facilitate material development and research.
1.9 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 materials, products, or assemblies under actual fire conditions.
1.10 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.
Note 1: There is no known ISO equivalent to this test method.
1.11 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
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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: D7309 − 21b
Standard Test Method for
Determining Flammability Characteristics of Plastics and
Other Solid Materials Using Microscale Combustion
1
Calorimetry
This standard is issued under the fixed designation D7309; 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* responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 This test method, which is similar to thermal analysis
mine the applicability of regulatory limitations prior to use.
techniques, establishes a procedure for determining flamma-
bility characteristics of combustible materials such as plastics.
NOTE 1—There is no known ISO equivalent to this test method.
1.11 This international standard was developed in accor-
1.2 The test is conducted in a laboratory environment using
dance with internationally recognized principles on standard-
controlled heating of milligram specimens and complete ther-
ization established in the Decision on Principles for the
mal oxidation of the specimen gases.
Development of International Standards, Guides and Recom-
1.3 Specimens of known mass are thermally decomposed in
mendations issued by the World Trade Organization Technical
an oxygen-free (anaerobic) or oxidizing (aerobic) environment
Barriers to Trade (TBT) Committee.
at a constant heating rate between 0.2 and 2 K/s.
1.4 The heat released by the specimen is determined from
2. Referenced Documents
themassofoxygenconsumedtocompletelyoxidize(combust)
2
2.1 ASTM Standards:
the specimen gases.
D883 Terminology Relating to Plastics
1.5 Therateofheatreleasedbycombustionofthespecimen
D5865 Test Method for Gross Calorific Value of Coal and
gases produced during controlled thermal or thermoxidative
Coke
decomposition of the specimen is computed from the rate of
E176 Terminology of Fire Standards
oxygen consumption.
E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.6 Thespecimentemperaturesoverwhichcombustionheat
E456 Terminology Relating to Quality and Statistics
is released are measured.
E691 Practice for Conducting an Interlaboratory Study to
1.7 The mass of specimen remaining after the test is
Determine the Precision of a Test Method
measured and used to compute the residual mass fraction.
E967 Test Method for Temperature Calibration of Differen-
1.8 The specimen shall be a material or composite material
tial Scanning Calorimeters and Differential ThermalAna-
in any form (fiber, film, powder, pellet, droplet). This test
lyzers
method has been developed to facilitate material development
E1591 Guide for Obtaining Data for Fire Growth Models
and research.
E2935 Practice for Evaluating Equivalence of Two Testing
Processes
1.9 This standard is used to measure and describe the
response of materials, products, or assemblies to heat and
2.2 ISO Standard:
3
flame under controlled conditions, but does not by itself ISO 13943 Fire Safety—Vocabulary
incorporate all factors required for fire hazard or fire risk
assessment of the materials, products, or assemblies under 3. Terminology
actual fire conditions.
3.1 Definitions:
1.10 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and is the direct responsibility of Subcommittee D20.30 on Thermal Properties. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Oct. 1, 2021. Published October 2021. Originally the ASTM website.
3
approved in 2007. Last previous edition approved in 2021 as D7309 – 21a. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D7309-21B. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7309 − 21b
3.1.1 Terms used in this standard are defined in accordance 3.2.17 specimen gases, n—the volatile chemical species
with Terminology D883, unless otherwise specified. For terms liberated during controlled thermal (oxidative) decomposi
...
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: D7309 − 21a D7309 − 21b
Standard Test Method for
Determining Flammability Characteristics of Plastics and
Other Solid Materials Using Microscale Combustion
1
Calorimetry
This standard is issued under the fixed designation D7309; 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, which is similar to thermal analysis techniques, establishes a procedure for determining flammability
characteristics of combustible materials such as plastics.
1.2 The test is conducted in a laboratory environment using controlled heating of milligram specimens and complete thermal
oxidation of the specimen gases.
1.3 Specimens of known mass are thermally decomposed in an oxygen-free (anaerobic) or oxidizing (aerobic) environment at a
constant heating rate between 0.2 and 2 K/s.
1.4 The heat released by the specimen is determined from the mass of oxygen consumed to completely oxidize (combust) the
specimen gases.
1.5 The rate of heat released by combustion of the specimen gases produced during controlled thermal or thermoxidative
decomposition of the specimen is computed from the rate of oxygen consumption.
1.6 The specimen temperatures over which combustion heat is released are measured.
1.7 The mass of specimen remaining after the test is measured and used to compute the residual mass fraction.
1.8 The specimen shall be a material or composite material in any form (fiber, film, powder, pellet, droplet). This test method has
been developed to facilitate material development and research.
1.9 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 materials,
products, or assemblies under actual fire conditions.
1.10 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
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.30 on Thermal Properties.
Current edition approved May 1, 2021Oct. 1, 2021. Published May 2021October 2021. Originally approved in 2007. Last previous edition approved in 2021 as
D7309 – 21.D7309 – 21a. DOI: 10.1520/D7309-21A.10.1520/D7309-21B.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7309 − 21b
NOTE 1—There is no known ISO equivalent to this test method.
1.11 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:
D883 Terminology Relating to Plastics
D5865 Test Method for Gross Calorific Value of Coal and Coke
E176 Terminology of Fire Standards
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E967 Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
E1591 Guide for Obtaining Data for Fire Growth Models
E2935 Practice for Evaluating Equivalence of Two Testing Processes
2.2 ISO Standard:
3
ISO 13943 Fire Safety—Vocabulary
3. Terminology
3.1 Definitions:
3.1.1 Terms used in this standard are defined in accordance with Terminology D883, unless otherwise specified. For terms relating
to precision and bias and associated issues, the terms used in this standard are defined in accordance with Terminology E456. For
terms relating to fire, the terms in this standard are defined in accordance with Terminology E176 and ISO 13943. In case of
conflict, the definitions given in Termi
...
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