MaTestLab > Test Standards > ASTM C518 Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
ASTM C518 Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
ASTM C518 is a standard test method used to determine the steady-state thermal transmission properties of building materials, insulation products, and composite structures. This test is conducted by measuring the heat flow through a test specimen under controlled temperature conditions.
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Introduction to ASTM C518
ASTM C518 is a widely accepted standard test method for measuring the thermal transmission properties of building materials, insulation products, and composite structures. The test method involves placing a test specimen between two plates of known temperature and measuring the steady-state heat flow through the specimen. The results obtained through this test method are used to determine the thermal resistance and thermal conductivity of the materials. The results obtained through this method are especially used for quality control, reliability check, performance evaluation, and specification purposes.
ASTM C518 test method is generally applicable to fully processed types of materials including building materials, insulation products, and composite structures. The desirable thermal conductivity and resistance characteristics are developed during processing. The final values of the procedure are stated in standard units of SI.
ASTM C518 Test Method
The test method ASTM C518 involves the use of a heat flow meter apparatus to measure the steady-state heat flow through a test specimen. The test specimen is placed between two plates of known temperature and the heat flow is measured under controlled temperature conditions. The thermal conductivity and thermal resistance of the test specimen can then be calculated based on the heat flow data.
The ASTM C518 test procedure involves the following steps:
Conditioning and mounting the test specimen
The test specimen is conditioned to the appropriate temperature and humidity levels. The test specimen is then mounted between two plates of the heat flow meter apparatus.
Applying temperature difference
A temperature difference is applied across the specimen by controlling the temperatures of the two plates. The heat flow through the specimen is measured and recorded until steady-state conditions are achieved.
Calculating thermal conductivity and resistance
The thermal conductivity and thermal resistance of the specimen are calculated based on the heat flow data.
ASTM C518 Specimens
Specimen details
ASTM C518 test method is applicable to a wide range of materials including building materials, insulation products, and composite structures.
Specimen dimensions
The acceptable specimen dimensions for ASTM C518 are at least 150 mm x 150 mm (6 in. x 6 in.) with a thickness of at least 25 mm (1 in.).
Specimen preparation
The test specimens are prepared in accordance with the manufacturer’s instructions and conditioned to the appropriate temperature and humidity levels prior to testing.
ASTM C518 Results
The ASTM C518 test method provides valuable data for determining the thermal transmission properties of building materials, insulation products, and composite structures. The thermal conductivity and thermal resistance data obtained through this test method can be used for material selection, design, and performance evaluation.
Tests related to ASTM C518 ASTM C177 is a standard test method for steady-state heat flux measurements and thermal transmission properties by means of the guarded-hot-plate apparatus. This test method is similar to ASTM C518 but involves different apparatus and test conditions.
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