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Static control for shelving

#25420

Static control for shelving | 8 August, 2003

Hello all,

I'm working at a CM with less then ideal material storage shelving when it comes to ESD protection. I've got ordinary painted shelving units that I need make ESD safe. I'm considering dissipative mats or spray coatings for each shelf, then daisy chaining the shelves to ground. Any experiences with this or suggestions would be much appreciated.

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kenBliss

#25421

Static control for shelving | 8 August, 2003

Hi Bman

At the risk of coming off as a �sales type�, you appear to be looking for a solution provider and probably opinions on your ideas. Regarding your method mentioned, This is not the most efficient way to run a stockroom but will work and will certainly be the least expensive method rather than replace shelving. You then can put your ESD bins on top of the mats and everything will be properly grounded and will pass as ESD audit. We've done this before for customers.

The much more efficient way is to use shelving designed to store what your storing that is easily adjustable to save floor space and allow visually control of your inventory. Flat shelves and bins only allow a place to put stuff.

We sell what you need to do any of the ways you appear to be trying to do it. We sell matting by the roll or cut to size, we can all install snaps in the mats to connect them together and offer cabling to hook to the snaps. We also offer reel shelving designed specifically to store SMT reels, Chip tubes, JEDEC trays and loose parts. http://www.blissindustries.com/products/smtreelstorage/reelstorage.htm

Happy to help in anyway, give us a call. Ken Bliss Bliss Industries 510-490-8401

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#25422

Static control for shelving | 8 August, 2003

Antistat sprays are a waste of time and money. These sprays just soaps disolved in water that absorb moisture from the air.

Your minimum requirements: Conductive floor mats and wrist straps that are properly grounded.

From there, consider using a field to meter to assess alternate mixes of: * Ground the shelving with ESD protective mats * Ground the shelving with carbon paper or cardboard * Nothing on the sheving * Various types of containers to srore parts * Protective smocks * etc

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ScottM

#25423

Static control for shelving | 8 August, 2003

> Hello all, > > I'm working at a CM with less then > ideal material storage shelving when it comes to > ESD protection. I've got ordinary painted > shelving units that I need make ESD safe. I'm > considering dissipative mats or spray coatings > for each shelf, then daisy chaining the shelves > to ground. Any experiences with this or > suggestions would be much appreciated.

Is this for the Stockroom or for production? Everything in the stockroom that is ESD sensitive should be in protective sealed faraday containers, ours are. We have steel painted shelving here sitting on bare cement. A Static meter didn't yield any readings from our shelving at all. Couldn't justify why additional grounding mats, etc., should be on the shelves. All production shelving is grounded wire racks. Scott

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#25430

Static control for shelving | 11 August, 2003

Tkanks to every one for their suggetions. Right now, I think that Scott's method is the best one for us.

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Steven

#25443

Static control for shelving | 13 August, 2003

Lets try this again, Every shelf system should be grounded individually. Every six feet per EOS/ESD requirements. Do not daisy chain anything. Secondly, Depending on the depth of paint,style of pain that your shelving system has. A static charge would,should discharge through the paint and into the metal and off to ground. However the rate of dissipation will depend on the thickness and type of paint. The cement floor if it is not sealed will dissipate any charge from the shelving rapidly. If it is sealed then the dissipation rate will be less rapid. Choices are, you could paint the shelving with esd paint. You can use esd matting on every shelf and make sure the shelf is grounded with a resistor in the ground wire. These are proper methods of static protection. The faraday cage suggestion is essential. good luck

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#25468

Static control for shelving | 14 August, 2003

An idea I just heard today would be to run a strip of copper tape across each shelf, then screw the tape into the shelf to ensure metal to metal contact. Considering the shelves seem to all have a path to ground through the supports, I don't see why this wouldn't work.

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