MaTestLab > Test Standards > ASTM C177 Steady-State Heat Flux Measurements and Thermal Transmission Properties
ASTM C177 Steady-State Heat Flux Measurements and Thermal Transmission Properties
ASTM C177 is a test method that determines the steady-heat flux measurements for materials having low thermal conductivity through the guarded hot plate apparatus. The specimen geometry with a large ratio of area to thickness is considered an acceptable measurement.
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Introduction to ASTM C177
ASTM C177 is a standard test method designed to measure the steady-state heat transfer properties of materials. This method is commonly used to determine the thermal conductivity and thermal resistance of various insulation materials. ASTM C177 is essential for quality control and specification purposes in industries such as construction, aerospace, automotive, and manufacturing.
ASTM C177 test method involves exposing a flat or curved specimen to a steady-state heat flux while measuring the temperature difference across the specimen. The thermal conductivity is then calculated using the heat flux, temperature difference, and specimen thickness.
ASTM C177 Test Method
The ASTM C177 test method involves using a steady-state heat flux apparatus, which consists of a heating plate, a cooling plate, and a specimen holder. The apparatus is designed to maintain a constant temperature difference across the specimen while measuring the heat flux and temperature difference.
Determination of Temperature Difference and Heat Flux
The test specimen is first prepared by cutting it to a uniform thickness and size. Two specimens with appropriate thicknesses, areas, and densities are taken. One of the specimens is then placed between the heating and cooling plates, and the heat flux is applied to the heating plate. The temperature difference across the specimen is measured using thermocouples or other temperature sensors, and the heat flux is measured using heat flux sensors.
Calculating Thermal Conductivity
The test is run until the temperature difference across the specimen reaches a steady-state condition. The thermal conductivity is then calculated using the heat flux, temperature difference, and specimen thickness. Since heat flux and its uncertainty are dependent on environmental and apparatus test conditions including the intrinsic properties of the specimen therefore a report including a proper description of the specimen and test conditions is prepared.
ASTM C177 Specimens
Specimen Details
The specimen size and shape vary depending on the material being tested. ASTM C177 allows for flat and curved specimens.
Specimen dimensions
The acceptable specimen thickness for ASTM C177 is uniform and between 3 mm and 50 mm.
Specimen preparation
The specimen is prepared carefully to ensure that it has a uniform thickness and is free of any surface irregularities that could affect the test results. The surface of the specimen is also ensured to be clean and free of contaminants.
ASTM C177 Results
This test method measures steady-heat flux and thermal transmission properties by using guarded hot plate apparatus. It also evaluates the thermal resistance of materials with low thermal conductivity. The thermal conductivity is measured in watts per meter-kelvin (W/mK), while the thermal resistance is measured in square meters per watt (m²/W).
Tests related to ASTM C177
ASTM C177 is a crucial test method for determining the steady-state heat transfer properties of materials. It provides critical information for quality control and specification purposes in various industries. Proper specimen preparation and testing procedures are essential to ensure accurate and reliable results. ASTM C518 is a similar test method that measures the steady-state thermal transmission properties of materials. ASTM C518 is used to determine the thermal resistance and thermal conductivity of building insulation materials.
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