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  • ASTM
    E1225-04 Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique
    Edition: 2004
    $103.58
    Unlimited Users per year

Description of ASTM-E1225 2004

ASTM E1225-04

Historical Standard: Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique




ASTM E1225

Scope

1.1 This test method describes a steady state technique for the determination of the thermal conductivity, , of homogeneous-opaque solids (see Note 1 and Note 2). This test method is for materials with effective thermal conductivities in the approximate range 0.2 200 W/(mK) over the approximate temperature range between 90 and 1300 K. It can be used outside these ranges with decreased accuracy. Note 0For purposes of this technique, a system is homogeneous if the apparent thermal conductivity of the specimen, A, does not vary with changes of thickness or cross-sectional area by more than 5 %. For composites or heterogeneous systems consisting of slabs or plates bonded together, the specimen should be more than 20 units wide and 20 units thick, respectively, where a unit is the thickness of the thickest slab or plate, so that diameter or length changes of one-half unit will affect the apparent A by less than 5 %. For systems that are non-opaque or partially transparent in the infrared, the combined error due to inhomogeneity and photon transmission should be less than 5 %. Measurements on highly transparent solids must be accompanied with infrared absorption coefficient information, or the results must be reported as apparent thermal conductivity, A.

Note 2

This test method may also be used to evaluate the contact thermal conductance/resistance of materials.

1.2 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.


Keywords


ICS Code

ICS Number Code 17.200.10 (Heat. Calorimetry)


DOI: 10.1520/E1225-04

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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