The ISO standard DIN EN ISO 22007-2
The ISO standard DIN EN ISO 22007-2
Hot Disk measurement technology is described in detail in this standard – find out what matters hereThe official title of this standard is “Plastics – Determination of thermal and electrical conductivity – Part 2: Transient surface source method (hot-disk method) (ISO 22007-2:2015); German version EN ISO 22007-2:2015” – it can be purchased from Beuth Verlag via
the following link (subject to a fee)
www.beuth.de/de/norm/din-en-iso-22007-2/229451565
Product Description
The standard specifies a method for determining the thermal conductivity and thermal diffusivity and thus the specific heat capacity per unit volume of plastics.
The experimental set-up can be designed in such a way that measurements can be carried out on test specimens of different sizes. The measurements can be carried out in gaseous environments and under vacuum at different temperatures and pressures. This method is suitable for testing homogeneous and isotropic materials as well as anisotropic materials with a uniaxial structure. (Excerpt from the Beuth introductory article)
The method is also known as the transient area source method or hot disc method.
What requirements are placed on the measuring device and sensors to ensure that this standard is 100% fulfilled?
The essential “building blocks” of ISO-compliant measurement technology are
– the special sensor geometry in the form of a bifilar spiral made of nickel in a circular shape
– a special electrical measuring bridge arrangement to realise the highly sensitive measurement of a transient curve depending on the smallest resistance changes in the sensor and
– the necessary electronic components such as a precision potentiometer and constant current source with minimal measurement inaccuracies
Due to the high demands on the above-mentioned measuring electronics and the necessary high-priced components installed, only the following hot disc measuring devices fully comply with DIN EN ISO 22007-2:2015:
– Hot Disk TPS 1000
The following hot disc measuring devices only work similarly to the DIN EN ISO 22007-2:2015 standard, but do not fully meet the requirements of the standard.
Operators of hot disc devices should take this information into account, e.g. when creating data sheets or publications in the sense of “good laboratory practice” in the information on the measurement technology used.
If you would like to take a closer look at the basics of DIN EN ISO 22007-2 – this is based on the following references:
- “Transient plane source techniques for thermal conductivity and thermal diffusivity measurements of solid materials”; Silas E. Gustafsson; Rev. Sci. Instrum., 62 (3), 797-804 (1991).
- “Thermal conductivity, thermal diffusivity, and specific heat of thin samples from transient measurements with Hot Disk sensors”; Mattias Gustavsson, Ernest Karawacki and Silas E. Gustafsson; Rev. Sci. Instrum. 65 (12), 3856 (1994).
- “On the Use of Transient Plane Source Sensors for Studying Materials with Direction Dependent Properties”; Mattias Karl Gustavsson and Silas E. Gustafsson; Proceedings of the 26th International Thermal Conductivity Conference, Massachusetts, Cambridge, 6-8 August 2005, edited by R. Dinwiddie (Oak Ridge National Laboratory, Oak Ridge, Tennessee, 2004), p. 367-377.
- “On the Use of the Hot Disk Thermal Constants Analyser for Measuring the Thermal Conductivity of Thin Samples of Electrically Insulating Materials”; J.S. Gustavsson, Mattias Karl Gustavsson and Silas E. Gustafsson; Thermal Conductivity 24, Eds. P.S. Gaal, D. E. Apostolescu (Lancaster, MA: Technomic), p. 116-122 (1997).
The standard itself is available for a fee from Beuth Verlag at
https://www.beuth.de/de/norm/din-en-iso-22007-2/229451565
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