This standard specifies the method for measuring the heat transfer properties such as thermal resistance and thermal conductivity in a steady state of flat thermal insulation materials using the protected hot plate method (GHP method). This measurement method measures steady-state temperature, heating power (heat flow rate), and thickness to determine heat transfer characteristics such as thermal resistance and thermal conductivity. It is a measurement method. This method is applicable to test specimens with a thermal resistance greater than 0,1 m·K/W within the thickness range according to 1.6.4. It is possible to measure thermal resistance up to about 0.02 m K/W, but the accuracy of the measurement is limited. Reference: The term "Guarded hot plate" is used for the entire device. For this reason, it is called the hogo hot plate method or GHP method measuring device. Since thermal conductivity can be measured directly in the pot as an absolute measurement method, it is sometimes called the "flat plate direct method." .
JIS A 1412-1:1999 history
2016JIS A 1412-1:2016 Test method for thermal resistance and related properties of thermal insulations -- Part 1: Guarded hot plate apparatus
1999JIS A 1412-1:1999 Test method for thermal resistance and related properties of thermal insulations -- Part 1: Guarded hot plate apparatus
1994JIS A 1412:1994 Test methods for thermal transmission properties of thermal insulations