IACS
International Annealed Copper Standard
IACS – International Annealed Copper Standard is a unit of electrical conductivity used in various electromagnetic testing methods, including eddy current testing. For day-to-day testing, it is more commonly used than the standard international scientific unit of siemens per metre (S/m) because its values are more manageable to use and remember. This IACS scale compares how good of a conductor a material is compared to annealed copper. For example, aluminium has a conductivity of 29,000,000 S/m or 50% IACS, ie half the conductivity of annealed copper.
For more information on IACS, see:
www.nde-ed.org/Physics/Materials/Physical_Chemical/ThermalExpansion.xhtml
WHAT THE HEC?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
For more information on IACS, see:
www.nde-ed.org/Physics/Materials/Physical_Chemical/ThermalExpansion.xhtml
WHAT THE HEC?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
| Material | Example conductivity (subject to temperature, alloy composition, heat treatment, ageing, stress, etc) | ||
| Siemens per metre (S/m) | % IACS | ||
| Annealed copper | 58,000,000 | 100 | Very good conductor |
| Aluminium | 29,000,000 | 50 | _ |
| Mild carbon steel | 6,990,000 | 12 | _ |
| Titanium | 561,800 | 1 | Very poor conductor |
