Paul,
This is a specification issue between conductive/dissipative/insulation.
Conductive Material < 10 to 5th power ohms/square cm
Dissipative material > 10 to 5th to <10 to 12th ohms/square cm
Insulative material >10 to 12th ohms/square cm
So you see dissipate is in between and will hold a charge for some period.
Training and Ionization are important tools for proper ESD protection in
addition to conductive/dissipate plastics.
To learn how ionization works visit http://www.electrostatics.com to learn
more about ESD go to the site and visit the links page and follow the
extensive links to the professional societies.
At 11:47 AM 03/31/98 +1000, you wrote:
>Peter ,
>could you stress the difference between conductive/grounded and
>dissipative ;
>conductive regime being great in explosive manufacturing factories can
>be deadly in electronics , especially the power segments of assembly and
>test .
>Too often I've seen really and truly personnel grounded without
>slightest idea of principles and danger involved .
>
>Thanks paul
>
>>----------
>>From: Peter Mariani[SMTP:[log in to unmask]]
>>Sent: Tuesday, 31 March 1998 10:23
>>To: [log in to unmask]
>>Subject: Re: [TN] ESD
>>
>>I agree with Mr. Hamilton but it not always pratical to make everything
>>conductive due to availability, cost or design requirements. PCB boards and
>>laminate for example are by design not conductive in many areas or in most
>>stages of manufacture. Grounding does not work unless the grounded item is
>>conductive.
>>
>>Ionization is a pratical cost effective tool to add to to the ESD tool box
>>along with training of the operators. To learn more about ESD and
>>ionization visit http://www.electrostatics.com.
>>
>>
>>
>>At 04:58 PM 30-03-98 -0700, you wrote:
>>>Fred,
>>>
>>>I am not clear from your message and I don't think the importance was
>>>made strong enough in the answers I have seen so far.
>>>
>>>EVERYTHING MUST BE GROUNDED / CONDUCTIVE!! One loose cannon so to speak
>>>can do all the harm. The tube, person, bag, table top, pop rivet gun,
>>>rivet supply container, ......you get the picture, all of it must be
>>>addressed for ESD. And don't forget the air. Then, after mounting, don't
>>>forget the device is now part of a PWBA. How is the PWBA handled????
>>>etc., etc., etc.
>>>
>>>And speaking from experience, it is such fun to go after, because it can
>>>be so elusive. You can also get REALLY carried away in the protection
>>>arena. However, the product may need it, and eventually you may be able
>>>to back off the ESD activities once you better define each areas'
>>>vulnerability.
>>>
>>>It may be worth it to get a specialist in to help you out.
>>>
>>>Best of luck to you, and I hope I have helped more than I have scared
>>>you!
>>>
>>>Richard Hamilton
>>>Clemar Mfg. / Rain Bird
>>>[log in to unmask]
>>>
>>>> -----Original Message-----
>>>> From: Fred Pescitelli [SMTP:[log in to unmask]]
>>>> Sent: Monday, March 30, 1998 2:06 PM
>>>> To: [log in to unmask]
>>>> Subject: [TN] ESD
>>>>
>>>> All,
>>>> We are having ESD problems with a particular FET, and are trying to
>>>> track
>>>> the problem down in our process. What is the proper procedure for
>>>> transferring parts from a tube to an ESD bag? We are also using blind
>>>> rivets to hold them down to a heatsink, can we be causing a problem
>>>> there?
>>>>
>>>> Fred Pescitelli
>>>> Phoenix Designs
>>>> 1285 Turner Rd.
>>>> Lilburn, GA 30047
>>>>
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>>
>>
>>Peter Mariani
>>
>>Ph. 215-513-0850
>>Fx. 215-513-0855
>>mailto:[log in to unmask]
>>
>>Visit http://www.electrostatics.com
>>to learn more about static electricity
>>
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