I sort of agree with Richard on the issue. I used to be a more zealous
advocate of gloves before I had to regularly deal with production floor
issues. Now I am less of an advocate.
Yes, cotton gloves are more comfortable. They give visiting customers a
nice warm and fuzzy because everyone equate clean with white gloves.
Watching too many English butlers I suspect. Maybe Graham was visiting.
As said before, the cotton usually contains chlorine from bleach, they tend
to absorb any hand oils and transmit to the exterior surface
When I am doing cleanliness evaluations here, I usually wear a powder free
vinyl glove by Oak Industries. If I am dealing with surfaces that may have
more aggressive chemicals, I use the purple nitrile gloves. I find both to
be comfortable.
The problem that I have with gloves in a production environment is that the
exterior of the glove is easily contaminated. If you get paranoid about
it, every time you scratch your nose or move your hair out of your eyes
(sadly not a problem for me either), the glove surface has been
compromised. You can go through a ton of gloves real fast. The question
always comes up on how paranoid people should be. How often should gloves
be replaced?
In our work here, our operators are taught to handle the boards by the
edges only. Does not always happen on the shop floor, but most of our
operators are very good about washing hands frequently. Then again, since
we have a good aqueous cleaning prior to conformal coating, we don't need
to be that paranoid about handling residues.
Doug Pauls
"Stadem, Richard"
<Richard.Stadem@G
D-AIS.COM> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
09/08/2005 01:52 Re: [TN] Clean before cleaning
PM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
"Stadem, Richard"
<Richard.Stadem@G
D-AIS.COM>
I happen to think that the blue nitrile gloves are best for handling
pwb's and components.
I do not know if they present any outgassing or chlorinating issues.
I do know they will not snag on lead protrusions and other hardware,
inadvertently causing dropped assemblies. White cotton gloves snag like
crazy.
However, the blue nitrile gloves cannot be used on boards that are hot.
They have no insulative properties.
They tend to not absorb fluxes and chemicals, but they do get dirty and
need to be thrown and replaced periodically.
The blue nitrile gloves protect the operator's hands from chemical
exposure. White cotton gloves retain chemicals and prevent evaporation
from the operator's skin.
The blue nitrile gloves are available in ESD-safe type. I don't think
the white gloves are.
For these reasons I prefer the blue nitrile gloves. But the operators
prefer the white cotton gloves, as they are more comfortable than the
blue nitrile, especially if you have hairy hands like mine. Too bad more
of it does not grow on the top of my head.
But then maybe thats why I don't come up with all of those hair-brained
ideas like others I work with!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Thursday, September 08, 2005 1:38 PM
To: [log in to unmask]
Subject: [TN] Clean before cleaning
Technos,
the question is whether to wear or not to wear gloves on assemblies that
will be washed. I am fully aware of the solderability problems that can
occur without gloves, so let's stick strictly to the post-wash
contamination.
And in the same key, Doug was talking about not using white gloves that
have chlorines due to bleaching. Which are the gloves to wear?
Thank you,
Ioan
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