ASTM-E1225:2009 Edition

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E1225-09 Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique

Published By	Publication Date	Number of Pages
ASTM	2009	9

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Categories: 17.200.10 - Heat. Calorimetry, ASTM

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Description

ASTM E1225-09

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, 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, λ_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 λ_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, λ_A.

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

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method
3	Significance and Use Requirements FIG. 2
4	TABLE 1 TABLE 2
5	FIG. 3
6	Sampling and Conditioning Test Specimens Calibration and Verification Procedure
7	Calculation Report FIG. 4
8	Precision and Bias REFERENCES

Additional information

Standard Title	E1225-09 Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique
Published Code	ASTM
Publication Date	2009
Pages Count	9
ICS Codes	17.200.10 - Heat. Calorimetry