Hi Phil,
We've got a 10-micron cartridge filter before the carbon bed, so that
should catch everything.
But just so I clearly understand why certain masks are bad for DI beds,
if you read the MSDS for Wondermask W (the light blue stuff) and look in
the ingredients:
http://www.techspray.com/download-msds-document.php?pId=67&mId=64
Is it the ionics of the 45-55% (by Wt.) of sodium salt of polymeric
carboxylic acid that kills the beds, and the 3-6% (by Wt.) of
diatomaceous earth/attapulgite clay that clogs the carbon?
Just trying to be able to give a good explanation of why we can't use
the mask with a closed-loop system...
Steve Gregory
-----Original Message-----
From: Nutting, Phil [mailto:[log in to unmask]]
Sent: Friday, May 17, 2013 2:06 PM
To: TechNet E-Mail Forum; Steve Gregory
Subject: RE: [TN] Water soluble masks compatible with closed-loop water
treatment systems
Steve,
With our closed loop system I found that I needed to add a fine mesh
filter on the Carbon bed inlet because it was not lasting long enough
due to clogging from crap (dust, leads, solder, solder mask) off the
boards. Clean the replaceable mesh regularly and I doubled by carbon
bed life. I also added a flow meter on the outlet to flag the operators
when the flow was dropping due to the crap in the mesh.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, May 17, 2013 3:22 PM
To: [log in to unmask]
Subject: Re: [TN] Water soluble masks compatible with closed-loop water
treatment systems
Hi Lloyd,
Yeah it does, but things get a little more complicated when you have a
closed-loop cleaner.
TechSpray claims that their Wondermask WSOL 2004 is safe on ion beds &
filters in closed-loop cleaning systems:
http://www.techspray.com/product-info.php?pId=66&cId=22
I called them to ask specifically what happens to the mask in a
closed-loop system, does it get filtered out in the carbon bed? Or does
it require some sort of pre-filter?
I was told that it would not be harmful to the ion beds, but I might
start seeing my water starting to turn pink from the red dye in the
mask. I was assured: "but it's not harmful..."
Well, that concerns me. I tend to agree with what Brian said in his
reply:
>>Good evening, all!
>>I personally would be very skeptical, indeed, of ANY w/s mask in a
closed loop system. It is asking for
>>reduced lifetime of carbon and/or DI columns.
>>I would suggest open loop pre-cleaning and use the closed loop just to
polish off. Alternatively,
>>a membrane micro-filter before the first column, but this will require
frequent backwash de-clogging.
>>Brian
I did find something that was written on one of Separation Technologists
web pages of a water soluble mask that they offer that is not harmful in
closed-loop systems:
http://www.separationtech.com/temporary_water.php
I called and talked with John Russo, and the first question he asked me
was how much was my usage? I couldn't answer him. But he said that
anything water soluble will affect
your beds in a closed-loop system. He said that he feels that his
material will affect the beds less than others. He's sending me a sample
to check out.
I'm beginning to think that if I want to protect my DI beds and the
water in a closed-loop system, I will have to think about kapton tape
and dots, or peelable masking...which I
know that my production manager won't be too excited about.
Just wondering if anybody has ever used any of the water soluble masks
in a closed-loop system that claim to be "safe"?
Steve Gregory
From: lduso - Diamond-MT.com [mailto:[log in to unmask]]
Sent: Friday, May 17, 2013 10:39 AM
To: Steve Gregory
Subject: Re: [TN] Water soluble masks compatible with closed-loop water
treatment systems
Ahhhh, now that it works great for!!
Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com
On Fri, May 17, 2013 at 10:28 AM, Steve Gregory <[log in to unmask]>
wrote:
Hi Lloyd,
I'm sorry I didn't make it clear. I'm referring to water soluble masks
before wave solder, not conformal coating....
Steve Gregory
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso -
Diamond-MT.com
Sent: Friday, May 17, 2013 7:25 AM
To: [log in to unmask]
Subject: Re: [TN] Water soluble masks compatible with closed-loop water
treatment systems
Tough to put into practice. With masking you want to get the masking
material off before the coating has completely cured to minimize lifting
and peeling. The washing machine could damage that uncured coating. Plus
the coating is covering the masking so the water will not touch the
masking to dissolve it until the coating is removed from it first. I
tried it with parylene and we had to pick holes in the film so the water
could access the masking then go back and trim off the excess after the
masking dissolved and we were left with a "tent" of film
Re-usable boots are ideal but could be costly when you have many
different style/sizes of connectors.
Like we tell all our customers, cheapest way to coat something is leave
off all the connectors!!
Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com
On Fri, May 17, 2013 at 9:08 AM, Steve Gregory <
[log in to unmask]> wrote:
> Morning all,
>
> Continuing on with the masking thread, I know Techspray has a water
> soluble mask that is supposed to be compatible with closed-loop water
> treatment systems, are there any others out there?
>
> Any pros/cons of using them?
>
> As always, thanks in advance!
>
> Steve
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud
service.
> For more information please contact helpdesk at x2960 or
> [log in to unmask]
> ______________________________________________________________________
>
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud
service.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud
service.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
|
