A bull market is hard to bear in the stock exchange.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Buetow
Sent: Tuesday, February 11, 2014 7:19 AM
To: [log in to unmask]
Subject: Re: [TN] Risks Associated with Calcium

This tangent on cow saliva got me wondering whether there's a Bizzaro TechNet where we all have bovine alter-egos.

E.g.:

Mike Buecow
Joyce Moo
Doug Paulstein
Dave Hillstein
Brahman Ellis


Anyway...

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Tuesday, February 11, 2014 9:11 AM
To: [log in to unmask]
Subject: Re: [TN] Risks Associated with Calcium

I have to print this one out and frame it.

I think Brian and I have stumbled across Plexus's secret cleaning process
- cows licking the electronics.  Low cost, the rough tongue represents mechanical removal.  Not sure what the surface tension of cow saliva is. I can just imagine the look on my co-ops face when I tell her to go research that......

Doug Pauls



From:   Brian Ellis <[log in to unmask]>
To:     TechNet E-Mail Forum <[log in to unmask]>,
[log in to unmask]
Date:   02/11/2014 07:43 AM
Subject:        Re: [TN] Risks Associated with Calcium



I bow to Doug's superior but cheesy knowledge (buttering him up!).
However, in dairy farming regions, the cow lick is a dangerous source of sodium contamination. A cow's tongue is like a rasp and she must liberate a fine lick powder when using one. In a high wind, this powder would travel at a good lick, onto everyone's PCBs. An ionic tester could cream off the salt deposits.

Brian

On 11.02.2014 15:17, Douglas Pauls wrote:
> Brian raises some excellent points, but I must disagree that the most 
> likely source of calcium is the tap water.
>
> Rich works up in Wisconsin (Up Nort).  Wisconsin is a dairy state and
cows
> are everywhere.  Using Brian's submicroscopic theory, your calcium is 
> coming from when cows walk by the plant.  Perfectly logical.  You have 
> a Holstein Crisis.
>
> Your second most likely source of calcium could either be from tap
water,
> or it could be coming from your solder mask.  Many masks have a 
> certain amount of calcium as a filler compound.  Elevated levels of 
> calcium in your extract solutions may mean the solder mask is not 
> fully cured or
that
> it is chemically degrading, allowing the filler material to leech out.
>
> Doug Pauls
>
>
>
> From:   Brian Ellis <[log in to unmask]>
> To:     <[log in to unmask]>
> Date:   02/11/2014 01:57 AM
> Subject:        Re: [TN] Risks Associated with Calcium
> Sent by:        TechNet <[log in to unmask]>
>
>
>
> Good point re CaCl2 used for deicing. As you probably know, in a 
> former life I made the Microcontaminometer. With the smallest tank, it 
> could measure down to picograms NaCl equivalent. I had some thoroughly 
> cleaned samples, 1" x 1" ceramic hybrid wafers, on my bench for testing.
> Suddenly, they showed ionic contamination levels much higher than they 
> should have, which puzzled me. I was pondering on this when I saw a 
> salt
> (NaCl) sprinkler going along the road and light dawned. The tyres of 
> cars passing kicked up an aerosol of slush and salt that presumably 
> evaporated leaving a suspension of submicroscopic salt crystals that 
> floated everywhere including into my lab, which was a good 20 m from 
> the road (and the windows were shut!). This hypothesis was confirmed 
> on a number of subsequent occasions.
>
> Similarly, I had a customer in Rennes at the foot of the Brittany 
> peninsula, about 50 km from the coast. He told me that his PCBs showed 
> consistently slightly higher ionic contamination readings when a 
> violent north-westerly Atlantic storm was raging.
>
> However, tap water is the most probable source of Ca.
>
> I'm afraid that 1 ppm is meaningless as such unless we know the area 
> from which the aliquot was derived. 1 ppm from a sample the size of an
> A4 paper sheet would be bugger all in terms of reliability but it may 
> be a different story if the sample was a small passive component.
>
> Brian
>
> On 11.02.2014 00:08, Richard Kraszewski wrote:
>> I am occasionally seeing irritating low levels of calcium in some
> assemblies that we test via ion chromatography.
>>
>> Some organizations required spec levels as low as <1 ppm.
>>
>> My questions to you techies is:
>>
>> #1 Besides wash water are there any other sources of calcium that 
>> come
> to  mind?
>>
>> #2 is there any real value in having Calcium specs down as low as 1
ppm?
>   (I suspect not and this spec was merely carried over from the 
> semiconductor industry where it may have more value)
>>
>> CH65 is of some help here in that is does speak much more of the 
>> evils
> of Na that Ca& Mg, but not as much as I had hoped.
>>
>> Thoughts??
>>
>> Rich  Kraszewski
>> Senior Process Engineer
>> Plexus Engineering Solutions
>>
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