ASTM C518

ASTM C518 is a standard test method for measuring the steady-state thermal transmission properties of insulation materials using a heat flow meter apparatus. This test method is used to determine the thermal conductivity and resistance of insulation materials, such as foams, fibers, and rigid boards, under steady-state conditions.

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Frequently Asked Questions

The ASTM C518 test provides valuable information about a material's thermal performance. The results obtained include Thermal conductivity, which indicates how effectively the material conducts heat, and thermal resistance, which signifies the material's ability to resist heat flow.

Specimens of ASTM C518 should have a parallel surface with a size of 150-300 mm2.

The method has been used at ambient conditions of 10 to 40°C with thicknesses up to approximately 250 mm and with plate temperatures from –195°C to 540°C at 25-mm thickness.

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