Question is what type of the flux you are using?
        What is the activation temperature and what is required soaking time
for the flux that you are using?
        The flux's that I am working with activates at 190 but not to exceed
210F(88-99C) and 210 not to exceed 230F (99-110C). My soaking goal is
minimum 10 seconds.
        As much I am able to see from your description, it appears to me
that you are overheating assembly and burning off flux before your board
hits the wave's.

        Thank you,
        Igor . . .
                -----Original Message-----
                From:   Michael Bell [SMTP:[log in to unmask]]
                Sent:   Wednesday, November 28, 2001 12:00 PM
                To:     [log in to unmask]
                Subject:        [TN] Organic Silver PCB's

                Hi there Technetters,

                I have now exhausted my efforts of improving the
solderability (T/H) of some
                RF Organic Silver PCB's we are currently making.  Every
attempt to improve
                the solderability has had no impact.  The soldered PCB's
show very poor
                wetting, partial joints and in some areas there is no
evidence of solder.
                The PCB is curretly being pre-heated to around 160 deg. C
topside and a bath
                temperature of 256 deg. C.  Is there something I am over
looking with the
                Organic Silver?  Is there any special method/ or profile for
Organic SIlver
                finished PCB's???  Any feedback would be appreciated.

                Cheers

                Mike


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