\section{Module mass and Young's modulus}
\subsection{Module mass}
To verify that the specifications concerning the material budget can be met detector prototypes and components have been weighted and if possible compared to specifications. The components are
\begin{itemize}
\item panels of 2.5m x 0.13m produced by AD-CO. 
\item panels of 2.5m x 0.13m produced by FACC.
\item an uncasted fibre mat produced by Aachen.
\item a casted fibre mat produced by Dortmund and casted in Heidelberg.
\item a dummy detector module of 2m x 0.53m by FACC. The sub-modules not available at the time of construction is mimiced by the use of 1mm thick polystrol panels.
\end{itemize}
The result of the measurements is shown in table \ref{table:massMeasurements}. 
\begin{table}[h]
\begin{tabular}{llll}
                                                                                               &                                                                            &                                                                                    &                                                                                                                                                                                                                             \\ \cline{2-4} 
\multicolumn{1}{l|}{}                                                                          & \multicolumn{1}{l|}{Producer}                                              & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}Measured\\ {[}g/m$^2${]}\end{tabular}} & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}Expected acc.\\ to specification\\ {[}g/m$^2${]}\end{tabular}}                                                                                                                  \\ \hline
\multicolumn{1}{|l|}{Panels}                                                                   & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}FACC\\ AD-CO\end{tabular}}  & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}1800 \\ 2400\end{tabular}}          & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}1880 \\ not specified\end{tabular}}                                                                                                                                          \\ \hline
\multicolumn{1}{|l|}{\begin{tabular}[c]{@{}l@{}}Fibremat\\ uncasted\end{tabular}}              & \multicolumn{1}{l|}{Ac}                                                    & \multicolumn{1}{l|}{1223}                                                          & \multicolumn{1}{l|}{1250}                                                                                                                                                                                                   \\ \hline
\multicolumn{1}{|l|}{\begin{tabular}[c]{@{}l@{}}Fibremat\\ casted\end{tabular}}                & \multicolumn{1}{l|}{Do + Hd}                                               & \multicolumn{1}{l|}{1512}                                                          & \multicolumn{1}{l|}{1500}                                                                                                                                                                                                   \\ \hline
\multicolumn{1}{|l|}{\begin{tabular}[c]{@{}l@{}}Dummy module\\ (after correction\end{tabular}} & \multicolumn{1}{l|}{FACC}                                                  & \multicolumn{1}{l|}{3640}                                                          & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}3580\\ (assuming a casted fibre mat\\  of 1512g/m2 as measured. \\  It includes also 2x100g/m2\\  of glue to bond sub-module to \\  CFRP, as specified by FACC\end{tabular}} \\ \hline
\multicolumn{1}{|l|}{\begin{tabular}[c]{@{}l@{}}Testbeam-like\\ module\end{tabular}}           & \multicolumn{1}{l|}{\begin{tabular}[c]{@{}l@{}}AD-CO + \\ Hd\end{tabular}} & \multicolumn{1}{l|}{to be measured}                                                & \multicolumn{1}{l|}{not specified}                                                                                                                                                                                          \\ \hline
\end{tabular}
\end{table}
\subsection{Young's modulus}
Young's modulus has been measured for the 2m x 0.53m FACC dummy module described above, as well as for a testbeam module made from FACC panels and a sub-module produced in Heidelberg from a mat produced in Dortmund. The module assembly has been performed in Heidelberg. The measurement of Young's modulus for the AD-CO testbeam-like module will be added soon. For comparison Young's modulus measured for a short (2.5m x 0.34m) detector module of the Outer Tracker is given, too. The results are:
\begin{itemize}
\item FACC dummy module (5m x 0.53m): 1.73GPa
\item FACC test-beam module (2.5m x 0.13m): 1.49GPa
\item AD-CO test-beam like module (2.5m x 0.13m):  to be measured
\item OT detector module (2.5m x 0.34m): 1.24GPa
\end{itemize}