Hello, d014w8:
I have found a website which contains a FAQ about antistatic shoes
ANTISTATIC SHOES
HOW THEY WORK, MATERIALS, LIMITS, DRAWBACKS.
http://www.pidigi.com/club/pidigi042001/pagina3_42001%20ingl.htm
"What are the advantages you can expect from antistatic footwear?
In several cases these shoes can dissipate on the ground the
electrostatic tension accumulated inside the body, avoiding in this
way the unpleasant occurring of shocks and sparks. In some working
environments, for instance where there is the risk of explosions, the
need to have such dissipation becomes vital, therefore conductive
shoes are used instead of those simply antistatic."
"How do you define the antistaticity of shoes?
The presence and the level of antistaticity are defined through the
electrical resistance, expressed in ? or k? or M? (Ohm, Kilo-Ohm,
Mega-Ohm) of the entire construction of the bottom, including all the
layers it is made of. This is logic, because the dissipation of the
electrostatic tension must take place between the foot and the ground,
through all the layers separating these “poles”. In order to guarantee
only the “antistatic” effect, i.e. the dissipation of the
electrostatic load, it should be enough to establish a maximum limit
of resistance, which could be for instance of 100 or 200 M? ; in fact
such a limit gets applied as recommendation for civil footwear.
Instead, for safety shoes, the regulation EN344 rules a maximum limit
of 1000 M? and also a minimum limit of 100 K? (0,1 M?). Such minimum
resistance, which would have nothing to do with the real requirements
connected with antistaticity, can be explained with an additional
purpose to foresee at the same time also a certain safety against
fulmination due to a contact with at least “normal” tensions of the
house, i.e. of 220 or 360 V. Therefore the antistatic sphere defined
by the regulation EN344 for safety shoes ranges from 0,1 to 1000 M?."
I hope it helps, if you want something more specific, please, don't
hesitate to ask for a clarification.
Regards.
Search terms used:
"Antistatic shoes" technology
://www.google.com/search?hl=en&ie=ISO-8859-1&q=%22Antistatic+shoes%22+technology&btnG=B%FAsqueda+en+Google&lr= |
Clarification of Answer by
joseleon-ga
on
25 Jul 2002 02:57 PDT
Hello, d014w8:
Don't forget we are here to help you and you are paying us for the
answers, so you can ask for any clarification you want ;-)
I have searched antistatic shoes looking for the soles material, and
here is my result:
Antistatic shoes
http://www.sirus-microtech.com/productlist.htm#S
Here you can see a model of antistatic shoes, and the sole is made
with Nitrile Rubber
And here
http://www.tut.fi/plastics/kumi-instituutti/kumikartoitus/alueet/a00-00.html#09
"Antistatic shoe sole - polyurethane outer side, rubber insert;
discharging static electricity along path of least resistance
A shoe sole comprising: a polyurethane outer sole having an electrical
resistance of approximately 40 MOhms in a standard wet/dry test and an
electrical resistance of approximately 20 MOhms in a standard wet/wet
test conducted according to British Standard 2050, and a rubber sole
insert having an electrical resistance of approximately 1 MOhm
positioned adjacent the outer sole such that static electricity in the
sole insert is capable of discharging from the sole insert along a
path of least resistance through the outer sole."
And here
http://www.calzaturificiochiaramonte.it/inglese/sicurezza_ing.htm
you can find several antistatic shoes, which soles are mainly made of
nitrile rubber
I also found this web which manufactures it's own material, T47 and
T48, but you must ask for its antistatic properties to them.
http://www.texon.com/product_guide_insole(1).htm
All I have found is about nitrile rubber and polyurethane, I hope this
is what you were looking for.
Regards.
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