ASTM C1058/C1058M-10(2023)
(Practice)Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation
Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation
SIGNIFICANCE AND USE
4.1 The various methods for measuring and calculating thermal properties provide data and information for manufacturer's published information, for comparison of related products, and for designers and users to evaluate insulation products for particular applications. For these purposes it is advisable to provide basic data and information produced under standard temperature conditions.
4.2 It is possible that thermal properties of a specimen will change with mean temperature, with temperature difference across the specimens, and with high temperature exposure. Data and information at standard temperatures are necessary for valid comparison of thermal properties.
4.3 The mean test temperatures to measure thermal properties shall be selected from those listed in Table 1. It is recommended that thermal properties of insulation materials be evaluated over a mean temperature range that represents the intended end use. For this situation, the lowest and greatest mean temperatures need to be within 10°C of the maximum and minimum mean temperature of interest. The temperature differences for any chosen mean temperature will depend upon both the thermal insulation application (see appropriate materials specification), the method of evaluation, and the limitations of the apparatus. Temperature differences or relevant temperature conditions required by ASTM material specifications shall take precedence over those recommended in this practice. (A) The values in degrees Fahrenheit given in this table are not intended to be exact conversions of those values in degrees Celsius.
4.3.1 Standard conditions are presented where both surfaces are exposed to fixed ambient temperatures that are typical for testing building constructions, both insulated and uninsulated (Table 2). (A) Thermal transmission properties of panels of various building constructions are thermal transmittance (U), and thermal conductance (C).(B) Celsius temperatures are standard. The values in degrees Fa...
SCOPE
1.1 This practice covers standard mean temperatures for reporting thermal properties of thermal insulations, products, and materials, and of related systems and components, both insulated and uninsulated.
1.2 Thermal properties shall be determined as a function of temperature by standard test methods. (Test Methods C177, C201, C335/C335M, C518, C745, C1114, C1363, Guide C653, and Practice C687, all in combination with Practice C1045.)
Note 1: Standard referenced materials are needed to span the temperature range of the tests.
1.3 This practice recommends standard conditions for use in testing and evaluating thermal properties as a function of temperature by standard test methods.
1.4 General applications of thermal insulations include:
1.4.1 Building envelopes,
1.4.2 Mechanical systems or processes, and
1.4.3 Building and industrial insulations.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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.
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: C1058/C1058M − 10 (Reapproved 2023)
Standard Practice for
Selecting Temperatures for Evaluating and Reporting
Thermal Properties of Thermal Insulation
This standard is issued under the fixed designation C1058/C1058M; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This practice covers standard mean temperatures for
reporting thermal properties of thermal insulations, products,
2. Referenced Documents
and materials, and of related systems and components, both
2.1 ASTM Standards:
insulated and uninsulated.
C168 Terminology Relating to Thermal Insulation
1.2 Thermal properties shall be determined as a function of
C177 Test Method for Steady-State Heat Flux Measure-
temperature by standard test methods. (Test Methods C177,
ments and Thermal Transmission Properties by Means of
C201, C335/C335M, C518, C745, C1114, C1363, Guide C653,
the Guarded-Hot-Plate Apparatus
and Practice C687, all in combination with Practice C1045.)
C201 Test Method for Thermal Conductivity of Refractories
C335/C335M Test Method for Steady-State Heat Transfer
NOTE 1—Standard referenced materials are needed to span the tem-
Properties of Pipe Insulation
perature range of the tests.
C518 Test Method for Steady-State Thermal Transmission
1.3 This practice recommends standard conditions for use in
Properties by Means of the Heat Flow Meter Apparatus
testing and evaluating thermal properties as a function of
C653 Guide for Determination of the Thermal Resistance of
temperature by standard test methods.
Low-Density Blanket-Type Mineral Fiber Insulation
1.4 General applications of thermal insulations include:
C687 Practice for Determination of Thermal Resistance of
1.4.1 Building envelopes,
Loose-Fill Building Insulation
1.4.2 Mechanical systems or processes, and
C745 Test Method for Heat Flux Through Evacuated Insu-
1.4.3 Building and industrial insulations.
lations Using a Guarded Flat Plate Boiloff Calorimeter
(Withdrawn 2008)
1.5 The values stated in either SI units or inch-pound units
C1045 Practice for Calculating Thermal Transmission Prop-
are to be regarded separately as standard. The values stated in
erties Under Steady-State Conditions
each system may not be exact equivalents; therefore, each
C1114 Test Method for Steady-State Thermal Transmission
system shall be used independently of the other. Combining
Properties by Means of the Thin-Heater Apparatus
values from the two systems may result in non-conformance
C1363 Test Method for Thermal Performance of Building
with the standard.
Materials and Envelope Assemblies by Means of a Hot
1.6 This standard does not purport to address all of the
Box Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3. Terminology
priate safety, health, and environmental practices and deter-
3.1 Definitions—For definitions of terms and symbols used
mine the applicability of regulatory limitations prior to use.
in this practice, refer to Terminology C168.
1.7 This international standard was developed in accor-
4. Significance and Use
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.1 The various methods for measuring and calculating
Development of International Standards, Guides and Recom-
thermal properties provide data and information for manufac-
turer’s published information, for comparison of related
1 2
This practice is under the jurisdiction of ASTM Committee C16 on Thermal For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Measurement. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved March 1, 2023. Published April 2023. Originally the ASTM website.
approved in 1986. Last previous edition approved in 2015 as C1058/C1058M – 10 The last approved version of this historical standard is referenced on
(2015). DOI: 10.1520/C1058_C1058M-10R23. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1058/C1058M − 10 (2023)
products, and for designers and users to evaluate insulation 4.3.3 For conditions where the temperature of only one
products for particular applications. For these purposes it is surface is fixed with the other exposed to fixed ambient
advisable to provide basic data and information produced temperature, use the mean temperatures of Table 1.
under standard temperature conditions.
4.4 These conditions must be stated to describe accurately
4.2 It is possible that thermal properties of a specimen will thermal properties such as thermal conductivity versus mean
change with mean temperature, with temperature difference temperature for thermal insulating materials. Thermal insula-
across the specimens, and with high temperature exposure. tions exhibiting inflection points due to the change of state of
Data and information at standard temperatures are necessary insulating gases (see Note 2), must be tested at sufficiently
for valid comparison of thermal properties. small temperature differences between (1) the hot and cold
sides and (2) between mean temperatures. The test temperature
4.3 The mean test temperatures to measure thermal proper-
differences used depend on the vapor pressure versus tempera-
ties shall be selected from those listed in Table 1. It is
ture relationship of the gases involved and the ability of the test
recommended that thermal properties of insulation materials be
apparatus to provide accurate measurements of low tempera-
evaluated over a mean temperature range that represents the
ture differences.
intended end use. For this situation, the lowest and greatest
mean temperatures need to be within 10°C of the maximum
NOTE 2—Certain closed-cell cellular plastic insulations are of this type.
and minimum mean temperature of interest. The temperature
5. Procedure
differences for any chosen mean temperature will depend upon
both the thermal insulation application (see appropriate mate-
5.1 Since there are distinctly different needs or uses for
rials specification), the method of evaluation, and the limita- thermal performance information, the test conditions selected
tions of the apparatus. Temperature differences or relevant
must be appropriate to the need or use.
temperature conditions required by ASTM material specifica-
5.2 Determine the use classification described in 5.3 and
tions shall take precedence over those recommended in this
choose the appropriate temperature conditions from the tables.
practice.
NOTE 3—These mean temperatures result from test temperatures for the
4.3.1 Standard conditions are presented where both surfaces
hot and cold surfaces. Report the hot and cold surface temperatures that
are exposed to fixed ambient temperatures that are typical for
are u
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