ISO 22007-2:2022
Plastics — Determination of thermal conductivity and thermal diffusivity — Part 2: Transient plane heat source (hot disc) method
Product Details
This method gives guidelines for testing homogeneous and isotropic materials, as well as anisotropic materials with a uniaxial structure. The homogeneity of the material extends throughout the specimen and no thermal barriers (except those next to the probe) are present within a range defined by the probing depth(s) (see 3.1).
The method is suitable for materials having values of thermal conductivity, ?, in the approximate range 0,010 W·m-1·K-1 NOTE 1 The specific heat capacity per unit volume, C, C = ? · cp, where ? is the density and cp is the specific heat per unit mass and at constant pressure, can be obtained by dividing the thermal conductivity, ?, by the thermal diffusivity, a, i.e. C = ?/a, and is in the approximate range 0,005 MJ·m-3·K-1 NOTE 2 If the intention is to determine the thermal resistance or the apparent thermal conductivity in the through-thickness direction of an inhomogeneous product (for instance a fabricated panel) or an inhomogeneous slab of a material, reference is made to ISO 8301, ISO 8302 and ISO 472.
The thermal-transport properties of liquids can also be determined, provided care is taken to minimize thermal convection.