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


----------------------------------------------------------------------------
-----
        Technet Mail List provided as a free service by IPC using LISTSERV
1.8d
        To unsubscribe, send a message to [log in to unmask] with following
text in
        the BODY (NOT the subject field): SIGNOFF Technet
        To temporarily halt delivery of Technet send the following message:
SET Technet NOMAIL
        Search previous postings at: www.ipc.org > On-Line Resources &
Databases > E-mail Archives
        Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
        information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315

----------------------------------------------------------------------------
-----

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------