Inge,
Ethylene is a vapor at -100C.  Could it be ethyl alcohol (Ethanol) or
isopropyl alcohol (2-propanol) used to clean the PWBs.  Both would be
compatible with the Acetone rinse afterwards as you indicated.

mark

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Saturday, September 13, 2008 2:08 PM
To: [log in to unmask]
Subject: Re: [TN] qualification of manual bench cleaning processes

Seven times!! What heaven of flux or soldering process do you use?
Something 
must be very wrong!
We run our boards, independent of if they are SnPb solderd or Leadfree 
soldered, independent on what flux is used and independent on what
boards 
are used, through a tunnel washer with Vigon 200 as agent. We have done
that 
for years without  seeing any  residues.  Yes, there are some parts that
are 
not allowed to go through that process, e.g. hybrids. They are  hand
cleaned 
in tanks filled with 60 Centigrades warm etylene, warm Aceton and
finally 
rinsed in DI. Three step with other words.
Inge


----- Original Message ----- 
From: "Gervascio, Thomas" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, September 13, 2008 12:14 PM
Subject: [TN] qualification of manual bench cleaning processes


We have in the past abandoned manual defluxing after hand soldering
(ROL0 and ROM0) rosin fluxes with in line saponified washes. Well in
some cases we have to run boards seven times through the in line wash
resulting in degraded anodized finish, part marking removal , etc. I am
trying to gather the experiences and methodoloy to select the best type
of manual defluxing processes and qualify to make sure that the process
is adequate and any residues would be benign. Would start with the
J-STD-001 cleaning process qualification testing on materials and
residues but was trying to see what other folks are using out there
rather than being bombarded with sales pitches.

Any experiences and information would be appreciated.
Tom

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