ASTM C1058-97
(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
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 may be determined as a function of temperature by standard test methods. (Test Methods C177, C201, C236, C335, C518, C745, C976, C1114, 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 temperature 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 building and industrial insulations.
1.5 The mean test temperatures to measure thermal properties for the two applications shall be selected from those listed in Table 1. It is recommended that thermal properties be reported at mean temperatures that span at least 80% of the intended end-use temperature range. 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 an apparatus. Temperature differences or relevant temperature conditions required by ASTM material specifications shall take parecedence over those recommended in this practice.
1.5.1 Standard temperatures are presented for conditions where both surfaces are exposed to fixed ambient temperatures that are typical for testing building constructions, both insulated and uninsulated (Table 2).
1.5.2 Standard temperatures are presented for conditions where the temperatures of the two surfaces are fixed and surface coefficients are not considered (Table 2 or Table 3).
1.5.3 For conditions where the temperature of only one surface is fixed with the other exposed to fixed ambient temperature, use the mean temperatures of Table 1.
1.6 The values given in SI units are to be regarded as the standard. Approximate inch-pound units are provided in the tables.
1.7 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.
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Standards Content (Sample)
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Designation: C 1058 – 97
Standard Practice for
Selecting Temperatures for Evaluating and Reporting
Thermal Properties of Thermal Insulation
This standard is issued under the fixed designation C 1058; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.5.2 Standard conditions are presented where the tempera-
tures of the two surfaces are fixed and surface coefficients are
1.1 This practice covers standard mean temperatures for
not considered (Table 2 or Table 3).
reporting thermal properties of thermal insulations, products,
1.5.3 For conditions where the temperature of only one
and materials, and of related systems and components, both
surface is fixed with the other exposed to fixed ambient
insulated and uninsulated.
temperature, use the mean temperatures of Table 1.
1.2 Thermal properties may be determined as a function of
1.6 The values stated in SI units are to be regarded as the
temperature by standard test methods. (Test Methods C 177,
standard. The values given in parentheses are for information
C 201, C 236, C 335, C 518, C 745, C 976, C 1114, Guide
only. Approximate inch-pound units are provided in the tables.
C 653, and Practice C 687, all in combination with Practice
1.7 This standard does not purport to address all of the
C 1045.)
safety concerns, if any, associated with its use. It is the
NOTE 1—Standard referenced materials are needed to span the tem-
responsibility of the user of this standard to establish appro-
perature range of the tests.
priate safety and health practices and determine the applica-
1.3 This practice recommends standard conditions for use in
bility of regulatory limitations prior to use.
testing and evaluating thermal properties as a function of
2. Referenced Documents
temperature by standard test methods.
1.4 General applications of thermal insulations include:
2.1 ASTM Standards:
1.4.1 Building envelopes,
C 168 Terminology Relating to Thermal Insulating Mate-
1.4.2 Mechanical systems or processes, and
rials
1.4.3 Building and industrial insulations.
C 177 Test Method for Steady-State Heat Flux Measure-
1.5 The mean test temperatures to measure thermal proper-
ments and Thermal Transmission Properties by Means of
ties shall be selected from those listed in Table 1. It is
the Guarded-Hot-Plate Apparatus
recommended that thermal properties of insulation materials be
C 201 Test Method for Thermal Conductivity of Refracto-
evaluated over a mean temperature range that represents the
ries
intended end use. For this situation, the lowest and greatest
C 236 Test Method for Steady-State Thermal Performance
mean temperatures should be within 10°C of the maximum and
of Building Assemblies by Means of a Guarded Hot Box
minimum mean temperature of interest. The temperature dif-
C 335 Test Method for Steady-State Heat Transfer Proper-
ferences for any chosen mean temperature will depend upon
ties of Horizontal Pipe Insulation
both the thermal insulation application (see appropriate mate-
C 518 Test Method for Steady-State Heat Flux Measure-
rials specification), the method of evaluation, and the limita-
ments and Thermal Transmission Properties by Means of
tions of the apparatus. Temperature differences or relevant
the Heat Flow Meter Apparatus
temperatue conditions required by ASTM material specifica-
C 653 Guide for Determination of the Thermal Resistance
tions shall take precedence over those recommended in this
of Low-Density Blanket-Type Mineral Fiber Insulation
practice.
C 687 Practice for Determination of the Thermal Resistance
1.5.1 Standard conditions are presented where both surfaces
of Loose-Fill Building Insulation
are exposed to fixed ambient temperatures that are typical for
C 745 Test Method for Heat Flux Through Evacuated Insu-
testing building constructions, both insulated and uninsulated
lations Using a Guarded Flat Plate Boiloff Calorimeter
(Table 2).
C 976 Test Method for Thermal Performance of Building
Assemblies by Means of a Calibrated Hot Box
C 1045 Practice for Calculating Thermal Transmission
This practice is under the jurisdiction of ASTM Committee C-16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurements.
Current edition approved May 10, 1997. Published August 1997. Originally Annual Book of ASTM Standards, Vol 04.06.
published as C 1058 – 86. Last previous edition C 1058 – 92. Annual Book of ASTM Standards, Vol 15.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C1058–97
TABLE 1 Mean Test Temperatures for Reporting and Evaluation
temperature for thermal insulating materials. Thermal insula-
of Thermal Properties of Thermal Insulations
tions exhibiting inflection points due to the change of state of
Mean Test Temperature
insulating gases (see Note 2), must be tested at sufficiently
Insulation Classification
A
°C °F small temperature differences between (1) the hot and cold
sides and (2) between mean temperatures. The test temperature
Building Envelopes −4 25
differences used depend on the vapor pressure versus tempera-
10 50
ture relationship of the gases involved and the ability of the test
24 75
apparatus to provide accurate measurements of low tempera-
38 100
43 110
ture differences.
Mechanical Systems or Processes and Building −200 −300
NOTE 2—Certain closed-cell cellular plastic insulations are of this type.
and Industrial Insulations: Use those listed in this
table above and the following:
5. Procedure
−100 −200
−75 −100
5.1 Since there are distinctly different needs or uses for
−50 −50
thermal performance information, the test conditions selected
−25 0
must be appropriate to the need or use.
100 200
150 300
5.2 Determine the use classification described in 5.3 and
200 400
choose the appropriate temperature conditions from the tables.
250 500
300 600 5.2.1 If the tables do not contain the appropriate temperature
350 700
conditions, specifically report exceptions.
400 800
5.3 Thermal insulation classifications are:
500 1000
600 1200 5.3.1 Building Envelopes—Typically, building assemblies
700 1400
or constructions, both insulated and uninsulated, are tested with
800 1600
both surfaces exposed to fixed ambient temperatures as pre-
1000 1800
1100 2000
scribed in Table 2. Normally, Test Methods C 236 and C 976
A
are used for evaluation of building assemblies. For building
The values in degrees Fahrenheit given in this table are not intended to be
exact conversions of those values in degrees Celsius.
envelopes in moderate climates
...
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