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October 2002

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Subject:
From:
Charles Caswell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 4 Oct 2002 07:10:50 -0500
Content-Type:
text/plain
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text/plain (270 lines)
NOT WHERE I WORK! YUCK

-----Original Message-----
From: Hogg, Blair K. [mailto:[log in to unmask]]
Sent: Thursday, October 03, 2002 2:11 PM
To: [log in to unmask]
Subject: Re: [TN] ESD ISSUE - bare skin with static straps


Are you advocating a naked work force?



-----Original Message-----
From: Gene Felder [mailto:[log in to unmask]]
Sent: Thursday, October 03, 2002 1:30 PM
To: [log in to unmask]
Subject: Re: [TN] ESD ISSUE - bare skin with static straps


Typically natural fibers are low charging.  Synthetic fabrics are very high
charging.  Eliminating clothing would be good for ESD control.

The ESD Smock shields (creating a type of Faraday Cage) the employees
clothing from ESD sensitive items.  Via the person's sweat layer, charges
are removed from the person using wrist straps (or ESD footwear & ESD
flooring).

Some information from the ESD Handbook TR 20.20:

ESD Handbook TR 20.20 paragraph 5.3.13.1 Introduction and Purpose/ General
Information
"While a person may be grounded using a wrist strap or other grounding
methods, that does not mean that insulative clothing fabrics can dissipate
a charge to that person's skin and then to ground. Clothing usually is
electrically separate or isolated from the body."

Per ESD Handbook TR 20.20 paragraph 5.3.13.3.1.3 Garment Construction "The
electrical integrity of the seams is critical and should be verified by
electrical continuity measurements between all panels of the garment (ESD
STM 2. 1)."

ESD Handbook TR 20.20 paragraph 5.3.13.2.6 Proper Use
"After verifying that the garment has electrical conductivity through all
panels, the garment should be electrically bonded to the grounding system
of the wearer so as not to act as a floating.
This can be accomplished by several means:
1. Ground the garment to the body through a wrist strap-direct connection
with an adapter
2. Ground the garment through a conductive wrist cuff in direct contact
with the skin of a grounded operator
3. Ground the garment through a typical separate ground cord, directly
attached to an identified groundable point on the garment
4. Garments should be worn with the front properly snapped or buttoned to
avoid exposure of possible charges on personal clothing worn under the
garment"

Per ESD Handbook TR 20.20 paragraph 5.3.13.6 Other Considerations "For
personnel safety, static control garments should not be worn in situations
where there is exposure to high voltage."

Gene Felder
[log in to unmask]


-----Original Message-----
From:   Genny Gibbard [SMTP:[log in to unmask]]
Sent:   Thursday, October 03, 2002 7:54 AM
To:     [log in to unmask]
Subject:        Re: [TN] ESD ISSUE

 << File: ATT00010.html >> I was just wondering about really hot
conditions.  Maybe my real question
is: Is a smock better protection than bare skin with static straps?  Just
curious.
And I plead the fifth on the K-Mart question.  Or am I allowed to plead the
fifth in Canada?  Don't answer that...

-----Original Message-----
From: Randy Bock Sr. [mailto:[log in to unmask]]
Sent: October 3, 2002 6:50 AM
To: TechNet E-Mail Forum.; Genny Gibbard
Subject: Re: [TN] ESD ISSUE


ESD is as big deal.  To protect the equipment  you have to take what ever
precautions are necessary, including smocks.  If you  have ever worked in a
clean room and have had to wear a bunny suit with hood and foot boots over
your shoes, and white gloves you will then discover the real meaning of the
word  uncomfortable.

A smock, any day.

Randy Bock Sr.
Quality Manager
Bryce
[log in to unmask] <mailto:[log in to unmask]>
203 729-5370 Ext 239



----- Original Message -----
From: Genny Gibbard <mailto:[log in to unmask]>
To: [log in to unmask] <mailto:[log in to unmask]>
Sent: Wednesday, October 02, 2002 4:30 PM
Subject: Re: [TN] ESD ISSUE

Is it as much a hazard as it is being portrayed?  If the conditions are hot
enough that people are uncomfortable wearing smocks, they probably won't be
wearing long sleeve shirts that can dangle in what you're working on.  In
fact, they are probably wearing the least they can get away with at their
place of employment - tank tops and shorts if allowed.  If they wear a
static strap, and heel strap, are they really in that much ESD risk?  They
might be at more risk for safety issues - solder splashes, cuts, etc., than
ESD issues.

-----Original Message-----
From: Gregg Klawson [mailto:[log in to unmask]]
Sent: October 2, 2002 11:51 AM
To: [log in to unmask]
Subject: Re: [TN] ESD ISSUE


Jim,

Higher humidity can lower the ESD risk but have them wear the smocks to be
safe.

Besides the humidity levels, it depends on what your operators are wearing.
Cotton, polyester or nylon have different triboelectric properties so build
up charge at different rates and amounts.  Think about how much static
builds up on your polyester socks versus your cotton socks in your clothes
dryer at home.

-- Gregg

At 08:00 AM 10/2/2002, you wrote:


Good day Technetters:

I need some opinions (this may be asking for trouble!).  Located in the
north east, temperature/humidity levels can change on a daily basis.  It
has
been our policy that, during summer months when the humidity is high, the
operators do not have to wear ESD smocks in areas that are not air
conditioned.  There is no hard fast rule as to what the conditions shall
be,
except that a decision is made (by yours truly) that smocks are optional
when conditions are uncomfortable.  I'm trying to select a specific
humidity
level to use as a criteria for the mandatory wearing of smocks.  I
understand that not wearing ESD smocks poses a risk, but the risk is
minimized during high humidity conditions.  What do you think of this
policy?  Any recommendations on a humidity level?

Thanks,
Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] < mailto:[log in to unmask]
<mailto:[log in to unmask]> >
631-595-5879

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