The ASTM C1371-04a standard, developed by the American Society for Testing and Materials (ASTM), defines a test method for determining the emissivity of typical materials using a portable differential thermopile emission meter. The purpose of this test method is to provide a comparative method for measuring the dispersion of opaque, high thermal conductivity materials near room temperature as a parameter for evaluating temperatures, heat fluxes, and derived thermal resistance of materials.
The test method described in the ASTM C1371-04a standard does not replace the test method defined in the ASTM C835 standard, which is an absolute method for determining the total hemispherical emission, or the test method defined in the ASTM E408 standard, which includes two comparative methods for determining the total normal emission. The portable emission meter can be calibrated to measure the total hemisphere emission.
If the surface of a material has a low emission, thermal radiation heat transfer is reduced. It is important to note that a low emission will also change a material's surface temperature, as the controlling factor in the use of insulation is sometimes condensation control or personnel protection. Consideration should be given to the effect of aging on surface emission in the selection of these materials. If the initial low surface spread of a material is not maintained during service, the long-term value of the material is reduced.
The test method described provides a tool for comparative periodic testing of low-emission surfaces in the field. In this way, the effects of aging on the reflection properties are monitored. This test method is used to measure total hemispherical emissions with an accuracy of better than plus/minus 0.02 units. The emissions of the calibration standards must have been derived from accurate and independent measurements of the total hemispherical emissions. This test method is not used for samples that are highly anisotropic or transparent to infrared radiation. This test method is also not used for samples with significant thermal resistance.
Briefly, this standard provides a test method for heat or cold climate thermal paint.
Among the numerous test, measurement, analysis and evaluation studies that our organization provides for businesses in various sectors, with its trained and expert staff and advanced technological equipment, standard testing services for determining the spread of materials close to room temperature using portable emissometers within the scope of ASTM C1371-04a standard. gives.
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