## 3 Preparation of the Samples  
A sheet tested was made from the reinforcement and a resin/hardener mixture (using infusion as a lamination technique). The lamination process started by applying a layer of release agent to the mould to avoid possible sticking of the sheets. LOCTITE FREKOTE 770-NC (Henkel, Dusseldorf, Germany) was used as the release agent. It was applied according to the manufacturer's specifications in six coats. In a further step, an appropriate number of layers of reinforcement were laid \"dry\". This was followed by the application of the remaining layers enclosing the mould: a delamination to facilitate the removal of the vacuum system from the sheet after curing, an infusion mesh to allow even distribution of the resin/hardener mixture throughout the sheet, and a felt mat to absorb excess resin. A vacuum system was applied to the part thus constructed. The spiral tubes through which the resin will flow into the laminated sheet were laid out, as well as the infusion valve and vacuum valve. The vacuum bag was placed on the assembly, pressing it against the butyl tape sealing the assembly and pushing the pins of the vacuum valve and infusion valve through it. The vacuum system was connected, allowing a vacuum between the bag and the glass sealed with butyl tape. Once the vacuum was switched on, the system was checked for leaks, and any leaks were sealed with additional butyl tape. The resulting pressure differential allowed the resin mixed with the hardener to be drawn in and impregnate the constructed part, as shown in Figure 2. The laminated part was left under vacuum for a period of 8 h to ensure that the resin was properly distributed and cured. The curing schedule of the laminates was provided by the material supplier.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter** & **Value** & \\ \hline Surface mass & 200 g/m\({}^{2}\) \\ Weave & Twill 2/2 \\ Material used in the thread & Toray 3K 200 tex \\ Material used in the matrix & Toray 3K 200 tex \\ Thickness & 0.32 \(\pm\) 0.03 mm \\ Density & 1.76 g/cm\({}^{3}\) \\ \hline \hline \end{tabular} \({}^{*}\)—data made available by the producer.  
\end{table}
Table 1: Technical characteristics of carbon fabric CC 200 T-120 [*].  
Figure 1: CC 200 T-120 carbon fabric.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Parameter**} & \multicolumn{4}{c}{**Value**} \\ \cline{2-4}  & **F80 Resin** & **Hardener FH60** & **Unit** \\ \hline Viscosity (at 25 \({}^{\circ}\)C) & 530 & \textless{}20 & mPa\textgreater{}s \\ \hline Density (at 25 \({}^{\circ}\)C) & 1.11 & 0.95 & mPa\textgreater{}s \\ \hline \hline \end{tabular} \({}^{*}\)—data made available by the producer.  
\end{table}
Table 2: Properties of F80 resin and FH60 hardener [*].  
Specimens of standardised dimensions were cut by a laser cutter from the laminated sheets after seasoning for a period of 14 days at ambient temperature. Examples of test specimens are shown in Figure 3. The specimens were cut in one direction due to the use of a 2/2 twill fabric, which is characterised by a repetitive diagonal pattern, using the same number (2) of warp and weft threads in both directions. The composite samples had non-standardised thicknesses, averaging 1.1 mm for a three-ply sheet.