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question.gif  FR4 material density in Mokka (HCAL) [message #1315] Tue, 27 November 2007 03:19
lucaci
Messages: 14
Registered: November 2007
Hello,
it was brought to my attention that there is an inconsistency in the PCB FR4 material density.

In the code of TBhcal05.cc it is stated that the densities are taken from
http://pcba10.ba.infn.it/temp/ddd/ma/materials/list.html
and the FR4 density is set to 1.025g/cm3.

However, in the above mentioned list, there are 3 materials with 'FR4' in the name: NEMA_FR4, M_NEMA FR4 and T_FR4.
Although they all have the same composition, their density differs: 1.025 g/cm3 for the first case, and 1.7 g/cm3 for the last two cases.

Does anybody know an explanation for this?

Regards,
Angela.
 
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