_____________________________________________________________________________________________ DIFFERENTIAL SCANNING CALORIMETRY STUDIES ON EUTECTIC (Sn63/Pb37) SOLDER PASTE & POWDER (DRAFT) TANG A.C.T. et al _____________________________________________________________________________________________ 1 DIFFERENTIAL SCANNING CALORIMETRY STUDIES ON EUTECTIC (Sn63/Pb37) SOLDER PASTE AND POWDER A.C.T.TANG Ph.D. & P.M.SARGENT Ph.D. CAMBRIDGE UNIVERSITY ENGINEERING DEPARTMENT TRUMPINGTON ST., CAMBRIDGE CB2 1PZ CUED/C-MATS./TR.188 JULY 1991 ABSTRACT In this work, the properties of eutectic solder paste (Sn63/Pb37) in a RMA flux and solder powder supplied by Alpha Metals have been investigated using Differential Scanning Calorimetry (DSC). The results show that i) the melting point for both the paste and powder samples occurs at 182˚C and ii) the effects of super-cooling occurs for both the paste and the powder samples in the scanning temperature range of between 50˚C to 190˚C with the scanning rate set at 5˚C per minute. The latent heat of solidification and melting have been measured for both sets of samples and it is also observed that there was no significant weight loss of the samples after the experiments.