The ESD Association has a new Packaging standard that is not quite
available, my understanding is it is off to the printer. It has been
through industry review, ESD S541 Packaging Material for ESD Sensitive
Items.
It includes: "Note: There is no correlation between resistance measurements
and the ability of a material to be low charging."
I was in a Packaging Working Group committee meeting, and said something
like, "well there is some correlation that if a material is
conductive/dissipative it will likely be less charging than an insulative
material. Right?" Similar to Eric's comment "The strips are black and
give the appearance of being made of a conductive material. But not so. I
have measured 100kV static..."
I was sternly told: There is no correlation between resistance measurements
and the ability of a material to be low charging.
Gene Felder
[log in to unmask]
-----Original Message-----
From: Eric Dawson [SMTP:[log in to unmask]]
Sent: Friday, April 25, 2003 12:52 AM
To: [log in to unmask]
Subject: Re: [TN] Velcro straps for matrix trays?
Hi Graham,
Having been responsible for starting the recent discussion on
abbreviations, I will be careful how I answer this query.
We receive matrix trays with Velcro strips securing them. The strips are
black and give the appearance of being made of a conductive material. But
not so. I have measured 100kV static when removing the strips quickly and
20kV when taking them off slowly. I prefer elastic bands, they generate a
little static but they are not in the same league as the Velcro.
Regards
Eric Dawson
> -----Original Message-----
> From: Collins Graham [SMTP:[log in to unmask]]
> Sent: Thursday, April 24, 2003 5:58 PM
> To: [log in to unmask]
> Subject: [TN] velcro straps for matrix trays?
>
> Good day Technet!
> A politically correct, abbreviation free question today. Nah, forget
> that! I don't have time to avoid acronyms.
>
> We have a problem with very expensive QFPs - they arrive on trays, and
> at some point either internally, or externally when we send them out for
> tinning, they are badly packaged. The matrix trays have in some cases
> has been held together less than firmly - elastic bands, for example.
>
> So - I'm looking for a source for velcro straps to put on matrix trays.
> A mundane question for such a highly technical body, but hopefully
> someone can shoot me the one liner "buy 'em from..."
>
> On a less serious note, how do we know that Jason and Steve Gregory are
> not the same person? Anyone ever seen them together? Maybe Jason
> Gregory is the good twin and Steve "Jaegermeister" Gregory is the bad
> one??? The answers "it depends", "to quote St. Doug, 'it depends'", or
> "they aren't the same, and we can't get broadband access for our
> commodore PET computers in Cypress" are not acceptable. If you run a
> Steve Gregory through a Westek Triton V inline cleaner, Strap an AutoSIR
> to him, and then check him in a Contaminometer, what results would you
> find?
>
> Have a good day all. TTFN!
>
>
> regards,
>
> Graham Collins
> Process Engineer,
> Northrop Grumman Canada Corporation
> Halifax
> (902) 873-2000 ext 6215
>
> ---------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
> Search the archives of previous posts at:
http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/html/forum.htm for
additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
> -----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
