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ASTM E1225-13 + Redline
Standard Test Method for Thermal Conductivity of Solids Using the Guarded-Comparative-Longitudinal Heat Flow TechniqueMore info
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 applicable to materials with effective thermal conductivities in the range 0.2 < λ < 200 W/(m·K) over the 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 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.
| Author | ASTM |
|---|---|
| Editor | ASTM |
| Document type | Standard |
| Format | File |
| ICS | 17.200.10 : Heat. Calorimetry |
| Number of pages | 10 |
| Replace | ASTM E1225-09 + Redline |
| Set | ASTMVOL1405 |
| Year | 2013 |
| Document history | ASTM E1225-09 + Redline |
| Country | USA |
| Keyword | ASTM 1225;ASTM E1225;ASTM E1225;10.1520/E1225-13 |