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June 2011

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From:
Robert Kondner <[log in to unmask]>
Reply To:
Date:
Mon, 20 Jun 2011 16:21:59 -0400
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Paul,

 I wonder how that compares to reaching in to the fridge and turning the
tubes or jars once a week. Probably takes 30 seconds?

 During 6 months I probably rotate that tube dozens of times just be using a
little paste here and there.

Bob K.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Monday, June 20, 2011 3:55 PM
To: [log in to unmask]
Subject: Re: [TN] Solderpaste Storage and Use

For low-use or specially formulated material in cartridges used a "bottle
roller" in the frig with o-ring on the cartridges...

http://www.labotal.co.il/products/1349/1756/1855.aspx

Never had a separation problem...

Doesn't work well with jars though...

If you can afford it, this is great for all your cartridges...

Paul

Paul Edwards
Process/Quality Engineering
Surface Art Engineering


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Mack
Sent: Monday, June 20, 2011 12:49 PM
To: [log in to unmask]
Subject: Re: [TN] Solderpaste Storage and Use

We have often seen flux separating and pooling in the tubes if they are kept
much longer than shelf life, both in or out of the fridge (usually
engineering samples that are left over). One of the advantages of tubes is
that operators can't whip it up and shear thin the paste before using and
cause separation at any time. I have not seen any poor solderability when we
have experimented with expired paste, but have not specifically tested for
this reason. The separation will occur before the solderability is affected
and will be an issue when printing. It is hard enough to control a printing
process, so make sure you have good paste controls. 

Best to organize regular monthly shipments of paste, and manage usage, and
don't treat it like sour cream (best before, good after). You should not
have to scrap much paste and still be able to work within the shelf life. 



Roger Mack  P.Eng. 
Manufacturing Specialist
Parker Hannifin Canada
Electronic Controls Division
1305 Clarence Avenue
Winnipeg, MB  R3T 1T4 Canada
direct 204 453 3339 x373
[log in to unmask]
www.parker.com/ecd







From:
"Robert Kondner" <[log in to unmask]>
To:
"'TechNet E-Mail Forum'" <[log in to unmask]>, <[log in to unmask]>
Date:
06-20-2011 14:25
Subject:
RE: [TN] Solderpaste Storage and Use



Hi,

 I do wonder where all these shelf live ideas comes from. Seems to me that
particle  size and flux type will make a BIG difference, like a power of 
10
or so.

A no clean type 3 paste with low levels of activity would seem (at least 
to
me) to last MUCH longer than say type 5 in an active OA flux. 

 Has anyone ever done reflow studies for different types of old paste? I
don't think a paste manufacturer would do such a test, I expect to get
blasted for even suggesting the idea.

But, Look at this link:

   http://www.endtimesreport.com/Prescription_longevity.html


Bob K.


 Hmmm, I have a bucket of ancient paste tubes. I should give them a try.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Mack
Sent: Monday, June 20, 2011 3:12 PM
To: [log in to unmask]
Subject: Re: [TN] Solderpaste Storage and Use

Most pastes have a refrigeration spec. which gives it  a shelf life of 6
months. If you are using 600g tubes most datasheets will require 8 hours 
to
acclimatise. Once out of the fridge we don't return it either, but always
sign initials, date and time on each tube. Create an out of fridge "on 
deck"
storage for 3 or 4 tubes, or a daily amount for a line. We use a fixture
that fills from the top and you pull tubes from the bottom like a canned
drink dispenser. If you take one, add a new one to the top from the 
fridge.
You will never run into trouble with your acclimitizing time, or pull too
much. Your paste likely has a shelf life for room temperature, so set a
spec. that discards all open tubes when pulled, for say, two weeks or a
month.  If you are using jars and storing working paste, sign and date it 
as
well and control the out of fridge time for that as well.



Roger Mack  P.Eng. 
Manufacturing Specialist
Parker Hannifin Canada
Electronic Controls Division
1305 Clarence Avenue
Winnipeg, MB  R3T 1T4 Canada
direct 204 453 3339 x373
[log in to unmask]
www.parker.com/ecd







From:
Amol Kane <[log in to unmask]>
To:
<[log in to unmask]>
Date:
06-20-2011 13:27
Subject:
[TN] Solderpaste Storage and Use
Sent by:
TechNet <[log in to unmask]>



I am re-writing our solderpaste use and storage procedures for water 
soluble and no clean fluxes (SnPb and Lead-free) to say, in essence the 
following:

"To be stored per the manufacturer's recommendations (usually upto 10C), 
must be at room temperature before it is dispensed on the stencil (at 
least an hour thawing is required). Maximum use period to be 8 hours. 
Re-refrigeration and use beyond 8 hours not permitted"

The pushback is to the prohibition of re-refrigeration (for use the next 
day) after it is thawed and use beyond 8 hours requirement. These 
requirements are due to concerns with moisture absorption by the 
solderpaste once thawed (affecting slump) and flux activity (due to 
ageing)

What criteria are all the learned folks on technet using for solderpaste 
management? Is there any literature available that looks at solderpaste 
use limits on time and temperature?

A logical solution would be to do a DOE to look at these parameters, but I 

am being asked to come up with something ASAP:).   love how these things 
work!




Thanks in advance


Amol


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