Desmear processability (1) Desmear evaluation weight change method (2) Desmear evaluation condition Panasonic Corporation Industrial Devices Company Electronic Materials Business Unit Circuit Board Materials Division Rev 1.1 (1) Desmear evaluation by weight change method Procedure Procedure Weight change (1) – (2) = Desmear evaluation = Test specimen Initial weight (1) Unclad laminate (100X100mm) Drying (1) Initial weight measurement Drying Water rinse Water rinse Drying Swelling Desmearing (1) Initial weight measurement Swelling Desmearing Neutralization (2) Weight measurement Neutralization Drying (2) Weight measurement Desmear evaluation (Weight change) The evaluation is carried out under various temperature and treating time, depending on part # and manufacture of chemical SEM before Desmear （×1000） SEM after Desmear （×1000） (2) Desmear evaluation condition process Swelling Etching reagent type alkaline permanganate temp. (C) 65-85 70-85 time (min) 5-10 10-15 process Swelling Etching reagent type organic solvent permanganate temp. (C) 35-40 70-85 time (min) 6-10 10-15 NOTE : Desmear parameters should be adjusted depending on board thickness, stack count and stack thickness etc. Recommendations about the amount of desmear weigh loss for our material are described by individual part number in Process Guidelines.