ASTM D7340-07(2023)
(Practice)Standard Practice for Thermal Conductivity of Leather
Standard Practice for Thermal Conductivity of Leather
SIGNIFICANCE AND USE
5.1 Part of the function of a shoe is to assist the foot in maintaining body temperature and to guard against large heat changes. The insulating property of a material used in shoe construction is dependent on porosity or the amount of air spaces present. A good insulating material has a low thermal conductivity value, k. The thermal conductivity value increases with an increase in moisture content since the k value for water is high, 0.0014 cal/s cm · °C (0.59 W/m·K).
SCOPE
1.1 This practice is intended to determine the thermal conductivity of a sheet material. This practice is not limited to leather, but may be used for any poorly conductive material such as rubber, textile and cork associated with the construction of shoes.
1.2 A constant heat source is sandwiched between two identical metal cylinders which are mounted with their axes vertical. A test specimen is placed on the top surface of the upper cylinder and a third identical metal cylinder is placed on top of the test specimen so that all the cylinders and the test specimen are concentrically aligned (see Fig. 1). The heat source is switched on and the temperatures of the three blocks allowed to reach equilibrium. The thermal conductivity of the test specimen is then determined from the steady-state temperatures of the three blocks, the exposed surface areas of the blocks and test specimen and the thickness of the test specimen.
FIG. 1 SATRA Lees' Disc Thermal Conductivity Apparatus
1.3 This practice does not apply to wet blue.
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
Relations
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: D7340 − 07 (Reapproved 2023)
Standard Practice for
1
Thermal Conductivity of Leather
This standard is issued under the fixed designation D7340; 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 D1610 Practice for Conditioning Leather and Leather Prod-
ucts for Testing
1.1 This practice is intended to determine the thermal
D1813 Test Method for Measuring Thickness of Leather
conductivity of a sheet material. This practice is not limited to
Test Specimens
leather, but may be used for any poorly conductive material
2.2 Other Standard:
such as rubber, textile and cork associated with the construc-
SATRA TM 146 Thermal Conductivity
tion of shoes.
1.2 A constant heat source is sandwiched between two 3. Terminology
identical metal cylinders which are mounted with their axes
3.1 Definitions:
vertical. A test specimen is placed on the top surface of the
3.2 thermal conductivity, n—the quantity of heat conducted
upper cylinder and a third identical metal cylinder is placed on
per unit time through unit area of a slab of unit thickness
top of the test specimen so that all the cylinders and the test
having unit temperature difference between its faces.
specimen are concentrically aligned (see Fig. 1). The heat
source is switched on and the temperatures of the three blocks
4. Summary of Practice
allowed to reach equilibrium. The thermal conductivity of the
4.1 A conditioned specimen of leather (see Practice D1610)
test specimen is then determined from the steady-state tem-
is placed between two plates at different temperatures. The
peratures of the three blocks, the exposed surface areas of the
upper plate is at a constant temperature while the temperature
blocks and test specimen and the thickness of the test speci-
of the lower plate is slowly changing. The temperature differ-
men.
ence is measured by thermocouples. The rate of flow of heat
1.3 This practice does not apply to wet blue.
through the specimen is proportional to the area and the
1.4 This standard does not purport to address all of the temperature difference of the faces of the specimen, and
inversely proportional to the thickness. Assuming no heat loss,
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- the amount of heat flowing through the specimen per unit time
priate safety, health, and environmental practices and deter- is equal to the amount of heat received by the lower plate
mine the applicability of regulatory limitations prior to use. (copper block receiver) per unit time.
1.5 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 5.1 Part of the function of a shoe is to assist the foot in
Development of International Standards, Guides and Recom- maintaining body temperature and to guard against large heat
mendations issued by the World Trade Organization Technical changes. The insulating property of a material used in shoe
Barriers to Trade (TBT) Committee. construction is dependent on porosity or the amount of air
spaces present. A good insulating material has a low thermal
2. Referenced Documents conductivity value, k. The thermal conductivity value increases
2 with an increase in moisture content since the k value for water
2.1 ASTM Standards:
is high, 0.0014 cal/s cm · °C (0.59 W/m·K).
6. Apparatus and Materials
1
This practice is under the jurisdiction of ASTM Committee D31 on Leather and
6.1 A “Lees’ disc” apparatus, see Fig. 1, consisting of:
is the direct responsibility of Subcommittee D31.03 on Footwear.
6.1.1 A metal, see 11.1.2, cylindrical block, which will
Current edition approved Dec. 1, 2023. Published January 2024. Originally
ɛ1
subsequently be referred to as block B1, with:
approved in 2007. Last previous edition approved in 2018 as D7340 – 07 (2018) .
DOI: 10.1520/D7340-23.
6.1.1.1 A diameter of (D), in millimetres, which is known to
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
an accuracy of 0.2 mm (see 11.1.1).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.1.2 A height of (H), in millimetres, which is known to an
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. accuracy of 0.2 mm (see 11.2).
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