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Description of ASTM-E1225 2009ASTM E1225-09Historical Standard: Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow TechniqueASTM E1225Scope 1.1 This test method describes a steady state technique for the determination of the thermal conductivity, λ, of homogeneous-opaque solids (see Notes 1 and 2). This test method is for materials with effective thermal conductivities in the approximate range 0.2 < λ < 200 W/(m·K) over the approximate temperature range between 90 and 1300 K. It can be used outside these ranges with decreased accuracy.
Note 1—For purposes of this technique, a system is homogeneous if the apparent thermal conductivity of the specimen, λA, 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 λA 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, λA. Note 2—This test method may also be used to evaluate the contact thermal conductance/resistance of materials. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 Copper alloy; Glass; Graphite; Guarded heat flow technique; Heat flow; Heating tests--chemicals/materials; Insulation; Iron; Longitudinal profile; Metals and metallic materials; Meter bar materials; Polymers; Refractories (general); Sensors; Silica content; Solid phase materials; Thermal conductance/conductivity; Thermal insulating materials; Thermal transmission properties; Tungsten; Alloys; Austenitic steel; Carbon; Ceramic materials/applications; Comparison techniques; Copper ICS Code ICS Number Code 17.200.10 (Heat. Calorimetry) DOI: 10.1520/E1225-09 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM 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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