(ASTM C 518) Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus - This test method covers the measurement of steady state thermal transmission through flat slab specimens using a heat flow meter apparatus.

(ASTM C 177) Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus - This test method covers the achievement and measurement of steady-state heat flux through flat-slab specimens using a guarded-hot-plate apparatus. The method encompasses both the single-sided and the double-sided mode of measurement. Both distributed and line source guarded heating plate designs are included, in principle, in this test method. The reader should consult the standard practices on the single-sided mode of operation and on the line source apparatus for further details on these variations of the method.

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