I agree with Phil. A white cotton chemistry lab coat is just a effective in real life.
Dave Fish
Phil Bavaro wrote:
> More than I should divulge about ESD Smocks and testing...I'm sure I won't
> make any friends with the ESD garment industry with this post, but there
> are some things that you should be aware of.......
>
> I am assuming that you are not procurring the smocks with a quality clause
> for meeting the EOS/ESD test requirements for smocks after laundering. If
> you are not familiar with these requirements, then you should start there
> first. Go find the spec and read it carefully.
>
> If your coats are like ours, you will discover that the junctions of the
> separate pieces are not connected electrically (shoulder to arm, etc)
> because that costs more money to make.
>
> You indicate a rivet is used, but is it used for each junction and is it
> rusting out after laundering (I hope you aren't drycleaning them) etc. I'm
> not too familiar with how they terminate Carbon Suffused Nylon (CSN) to a
> metal rivet and still ensure conductivity long term, but yours might be ok
> if you were to perform the correct test on it.
>
> If you don't have it specified in your garment procurement contract to test
> the smocks after each washing, then you are getting what you are paying
> for, which isn't necessarily a bad thing.
>
> Also, I am not aware of a heel and wriststrap tester which is set up for
> testing smocks cuff to cuff either because there is no pressure applied by
> just connecting the snaps.
>
> In my opinion, smocks are generally a waste of time for ESD protection
> purposes, but we have always worn them because of the management aspect of
> having uniformity within the plant.
>
> We rely on our esd shoes for the dissipation of charges from the operators
> which has been shown to be superior or at least equal to any other method
> and always more cost effective.
>
> The strands of conductors that you may see (usually a criss-cross pattern
> of CSN) are indeed compensating for the raw garment materials which may or
> may not be dissipative by itself and the cuff snaps are intended for
> tightening up the sleeve opening at the wrist and not for connection to
> test apparatus.
>
> Of course, our operators wear mostly cotton clothing and no one wears
> nylons, polyesters and angora sweaters in San Diego. If they did, I might
> be a lot more concerned about the quality of the smocks, testing, and the
> level of protection that the smocks might provide.
>
> Also, if it helps, our smocks are not tested by contract and they would
> fail if tested per the EOS/ESD methods as well because they do not have the
> pieces interconnected.
>
> And yes, they are always yelling at me to close my smock as well.
>
> Phil
>
> At 12:22 PM 5/5/00 -0400, Lou Hart wrote:
> >Technetters, got a question about resistance (or surface resistivity) of
> >static dissipative lab coats.
> >
> >I've been pushing for people to keep their coats closed here, as suggested
> >by several technetters a few weeks back.
> >
> >Now one of the operators tells me, Those lab coats don't work, I tried to
> >measure the resistance and they are no good.
> >
> >
> >So I went to our wrist and heel strap checker and found I could not get my
> >cuff to cuff resistance to pass either wrist or heel check. It failed high.
> > When I checked the resistance between snaps on one cuff, using a
> >multimeter, I found 10-20 megohms. My coat is white with grey threads
> >through it, the conductive nylon filaments, I guess. It's made from 4 or 5
> >or more pieces of material, like a lot of coats. There is a metal rivet in
> >each sholder where 3 pieces of fabric come together, that looks like it's
> >supposed to connect the nylon from the various pieces.
> >
> >Can anyone comment on my experience?
> >
> >Lou Hart
> >
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