One more thing...
We shake off the excess water then air dry in warm air (100F) ovens.
Bob Landman
H&L Instruments, LLC
On Sep 8, 2010, at 3:41 PM, Bob Landman wrote:
> We use water-soluble solder flux washed with hot water-softener treated tap water on sensitive analog fiberoptics
> receiver circuits. We have never seen any leakage problems (signals as low as 1 x10-9 amps).
>
> What concerns me is any flux residue - concerned that humidity (our fiberoptic products are used outside in climates like
> Florida) so leakage from residues could cause problems.
>
> Bob Landman
> H&L Instruments, LLC
>
> On Sep 7, 2010, at 8:22 AM, Robert Kondner wrote:
>
>> Doug,
>>
>>
>>
>> I did forget to mention to blow the water off the board with an air gun, a
>> very important step.
>>
>>
>>
>> Tap water limits are about 500mg per L, at least that is my quick check on
>> the web. Sounds like a lot compared to what I see here but lets use that
>> number.
>>
>>
>>
>> Lets assume I have a 1mm drop (1/2 sphere) per square inch of PCB, that is
>> about 1/2 mm cubed. (Drops are very small after the air gun.
>>
>>
>>
>> 1 L = 10**6 mm cubed.
>>
>>
>>
>> So, on my board I can expect .250g/10**6 = .25ug / in squared. Wow, sounds
>> low, did I miss a few magnitudes of 10 somewhere?
>>
>>
>>
>> So how bad is tap water again?
>>
>>
>>
>> I saw some specs allowing 10ug/in**2 so I guess that means I can have 40
>> drops of tap water per in **2.
>>
>>
>>
>> Thanks
>>
>> Bob Kondner
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
>> Sent: Tuesday, September 07, 2010 9:14 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Hand Soldering
>>
>>
>>
>> Ohhhh, I beg to differ. Water soluble fluxes are more active and will
>>
>> probably do OK for soldering, but they also represent a danger if you do
>>
>> not totally remove them or if some of it flows into places and does not
>>
>> get rinsed out. What really makes me nervous about your approach is your
>>
>> choice of equipment and cleaners. Tap water sucks as a cleaner and hot tap
>>
>> water only slightly better. You might be able to remove the visible
>>
>> residues, but will still have invisible residues that will cause problems.
>>
>> In some cases, you are putting on more contaminants with the tap water
>>
>> than you are removing.
>>
>>
>>
>> We use low residue fluxes here on class three product and have a number of
>>
>> cases where the the residues are left in place. It is simply a matter of
>>
>> finding a flux and cleaning combination that works well together, and
>>
>> limiting the amount of additional flux you add. A skilled operator can do
>>
>> soldering with no more flux than is in the core of the wire. You may need
>>
>> a slightly larger core.
>>
>>
>>
>> Ken, I would suggest this short list to you. Use either Kester 245 low
>>
>> residue flux (P3 core) or Alpha Telecore Plus (also P3 core). Both are
>>
>> standards here and work well for soldering. For topical cleaning
>>
>> solutions, try Kyzen's Cybersolv 141b or Chemtronics Flux-Off Heavy Duty.
>>
>> Both these cleaning agents work well with the fluxes I named.
>>
>>
>>
>> Doug Pauls
>>
>> Rockwell Collins
>>
>>
>>
>>
>>
>>
>>
>> Robert Kondner <[log in to unmask]>
>>
>> Sent by: TechNet <[log in to unmask]>
>>
>> 09/06/2010 01:27 PM
>>
>> Please respond to
>>
>> [log in to unmask]
>>
>>
>>
>>
>>
>> To
>>
>> [log in to unmask]
>>
>> cc
>>
>>
>>
>> Subject
>>
>> Re: [TN] Hand Soldering
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Ken,
>>
>>
>>
>> In my mind there is absolutely no question, hand assemble using Water
>>
>> Soluble flux. A good spray under hot water cleans well.
>>
>>
>>
>> During final assembly or rework I might use a no clean at spots. The only
>>
>> problem is the no clean is VERY DIFFICULT to remove so don't try. It
>>
>> detracts from board appearance.
>>
>>
>>
>> It the spot being reworked is a sensitive analog circuit they rework
>>
>> using
>>
>> Water Soluble. For anything close to fine pitch SMT you should be applying
>>
>> liberal quantities of Water Soluble flux, only way to rework.
>>
>>
>>
>> You can get a little "Water Pick" real cheap. Load it with hot water and
>>
>> you can you can really get down into the nooks and crannies.
>>
>>
>>
>> Bob Kondner
>>
>>
>>
>> -----Original Message-----
>>
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
>>
>> Sent: Monday, September 06, 2010 8:30 AM
>>
>> To: [log in to unmask]
>>
>> Subject: [TN] Hand Soldering
>>
>>
>>
>> Hi all.
>>
>> What is the best setup for hand soldering as far as solder / cleaner?
>>
>> Rosin core? Water soluble? No-Clean?
>>
>> What cleaner too?
>>
>>
>>
>> I've been using rosin core with various cleaners but I have a hard time
>>
>> with
>>
>> the white residue the cleaners leave.
>>
>>
>>
>> Thanks
>>
>> Ken
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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