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BS EN ISO 22007-2:2022

BS EN ISO 22007-2:2022

$142.49

Plastics. Determination of thermal conductivity and thermal diffusivity – Transient plane heat source (hot disc) method

Published By Publication Date Number of Pages
BSI 2022 30
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This document specifies a method for the determination of the thermal conductivity and thermal diffusivity, and hence the specific heat capacity per unit volume of plastics. The experimental arrangement can be designed to match different specimen sizes. Measurements can be made in gaseous and vacuum environments at a range of temperatures and pressures. 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 < ? < 500 W?m?1?K?1, values of thermal diffusivity, ?, in the range 5 × 10?8 m2?s?1 < ? < 10?4 m2?s?1, and for temperatures, T, in the approximate range 50 K < T < 1 000 K. 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, ?, i.e. C = ?/?, and is in the approximate range 0,005 MJ?m?3?K?1 < C < 5 MJ?m?3?K?1. It is also referred to as the volumetric heat capacity. 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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principle
11 5 Apparatus
13 6 Test specimens
6.1 Bulk specimens
14 6.2 Anisotropic bulk specimens
6.3 Slab specimens
15 6.4 Thin-film specimens
7 Procedure
17 8 Calculation of thermal properties
8.1 Bulk specimens
20 8.2 Anisotropic bulk specimens
21 8.3 Slab specimens
22 8.4 Thin-film specimens
23 8.5 Low thermally conducting specimens
8.5.1 Introductory remarks
8.5.2 Low thermally conducting bulk specimens
24 8.5.3 Low thermally conducting anisotropic bulk specimens
25 8.5.4 Low thermally conducting thin–film specimen
9 Calibration and verification
9.1 Calibration of apparatus
9.2 Verification of apparatus
26 10 Precision and bias
27 11 Test report
28 Bibliography

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BS EN ISO 22007-2:2022
$142.49