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November 2001

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Subject:
From:
"<Peter George Duncan>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 12 Nov 2001 10:49:22 +0800
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Genny,

If you're hunting for info on the Net, the Hot Oil levelling process used
also to be known as "Hydro-Squeegee". It did indeed produce a fairly flat
finish ( often better than some HASL finishes I've seen), but as the name
suggests, it's messier than an air knife.

If dim and distant memory serves at all well, Hot Oil Reflow did just that
- it reflowed the solder on the board with no attempt to level it in any
way, whereas the Hot Oil Solder Levelling or Hyrosqueegee method did level
solder. My previous Company used to use it recover boards from which the
components had been salvaged, or on which the HASL finish was too thick to
start with. This process originated in the days of "conventional"
technology (plated through-hole), and I haven't so far heard of it being
used for SMT boards. Not to say it couldn't be used for SMT, but HASL is
possible more accurate and less contaminating.

Peter Duncan




                    Genny Gibbard
                    <Genny.Gibbard@W        To:     [log in to unmask]
                    AVECOM.CA>              cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    Sent by: TechNet        Aero/ST Group)
                    <[log in to unmask]        Subject:     [TN] Hot Oil
                    >


                    11/10/01 01:27
                    AM
                    Please respond
                    to "TechNet
                    E-Mail Forum."






You learn something new (or new to you) every day.
I was just told of a board finishing process called Hot Oil Solder
Levelling.  It was portrayed as a very flat, nice finish.  I was also told
that it is old technology, which may be why I am not familiar with it.  It
is only within the last year that I have really gotten involved with
specifying board finishes.  I've been searching on the internet to learn
more and am a bit confused.
My questions:
Is Hot Oil Reflow and Hot Oil Surface Levelling the same thing?  If not,
what is the difference?
What are advantages/disadvantages to this over HASL, or any of the newer
so-called 'flat' finishes needed for fine pitch?

Thanks.

Genny Gibbard (mailto:[log in to unmask])

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