Plyform sidewalls thickness A.Brez INFN Pisa The sidewall –X were made by Plyform with 12 plies of K13D2U-CE3-116/33 and 2 layers of SF-YS90A-75/CE3, 75GSM, 40%RC. The nominal thickness of the k13D ply is 116/.67/1.75=99mm (assuming r=1.75 gcm-3) The nominal thickness of the YS90 tissue is 75/.60/1.75=71mm (assuming r=1.75 gcm-3) The totale laminate thickness is: 12X0.099+2X0.071=1.33mm

-X +X Plyform has laminated 2 sidewalls and 2 mini-sidewalls together. Tray 1 Tray 19 Plyform has laminated 2 sidewalls and 2 mini-sidewalls together. The thickness of the sidewall –X has been measured along the blue dashed lines.

Conclusions The sidewalls thickness in the center of the laminate is close to the nominal one (1.37mm vs 1.33mm). There is a ~7cm frame all around in which the laminate thickness decreases (minimum thickness 1.26mm on the top left corner). This thickness decrease is due to a resin loss. The amount of resin loss can be optimized: A top Al plate, 6mm thick, has been used. This plate could have increased the resin loss area. Optimization of the vacuum valves positions has to be implemented. The resin loss is the reason of the Plyform tests discrepancies: they laminate small areas to do the prepreg tests.