Hi Patrick,
         I have done the same test before using 3M static event detector and
3M metal in shielding bags. I give this bag a charge of 1.5kV, they all
pass. What I want to know is are you using the metal in or metal out bags.
Strictly speaking, metal in bag is not reuseable. If you are using a metal
out bag, 3M has a bag checker which can check your bag. As for the metal in
bags, there is a checker call V-zap (not a 3M product) which can be used to
verify the bags. 

By right, if you pump in a voltage of 2kv, the bags are not suppose to fail.
Check if the bag is severely crumpled. Probably the metal layer is already
broken. 

Feel free to send e-mail to me if you want more info. Thanks



At 03:45 PM 9/15/97 -0400, you wrote:
>I'm sending this e-mail for a partner.
>
>I recently bought myself a 3M static event detector to evaluate my static
>shielding bags.
>What I do is insert this device into the bag and with a "ZAPPER", I give
>this bag an electrostatic discharge ranging from 2kV to 20kV.  If the LCD
>display from the device turns red, a static event as been recorded.  How
>strange?  Most of our bag failed this simple test.  My questions are:
>
>1) Is it possible that I'm using the wrong test to verify the shielding bag?
>2) Why the bag is called "static shielding" when a discharge can go through
>the bag and make    the display turn red (ESD event detected)?
>3) Is there another way to test the bag?
>4) If a static event was detected with the device inside the bag, is it
>possible that when this bag is manipulated by personel, a discharge may
>dammage the sensitive product inside the bag?
>
>Any comment or answer would be very appreciated.
>
>Thanks
>-------------------------------------------------
>Patrick Ducas
>Process Quality Engineer 
>Matrox Electronic Systems Ltd
>E-mail: [log in to unmask]
>Tél:(514)969-6000 ext.2971   Fax:(514)685-3415
>-------------------------------------------------
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