Desmear processability Rev1.10

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.
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