Posted by culverpratt on
URL: https://www.es-forum.com/shielding-a-computer-keyboard-mouse-tp1543473p1543542.html

Dear Emil, just getting a small chance to skim the manifold details
of the lessemf.com website -- it is PACKED with information which I
hope to get the opportunity to read soon. In particular all the links
in the "EMF Safety News and Information" section.

Meanwhile, I am trying to understand the fabric pages immediately (so
I can order some). Therefore I have some questions.

Considering that I want to make a little tent-like garment to sit
inside, with gloves sewn on (and maybe with a faceplate or eye-slit
of as transparent a shielding material as possible), and that what I
am trying to shield against here is Electric fields, could you tell
me:

1. Do I need to be concerned about Conductivity/Resistivity ratings?
If Yes, then:
? Do I want a fabric that is conductive? (I don't understand this
issue)
? What is resistivity, and how does that relate to conductivity? (I
assume less resistivity is best?)

2. dB:
? the shielding is rated in dB. This dB is often shown in relation to
something in MHz and GHz. Does this have to do with what sort of
field is being shielded? What would the electric field be, if so?

3. Electric field shielding:
? Are there some listed fabrics that do NOT shield the electric field?


-- I am chemically sensitive, so would want to stay away from
anything that offgasses or is not nice to skin. It looks to me like
these 3 are left after filtering for these issues:

- NaturaShield -- 20-35 dB
- Ex-Static Fabric -- cheapest, but what is its dB rating?
- Zelt Fabric -- 80 dB

? Are there others that would be appropriate that I have missed?
? Should I get enough that the fabric closes under my feet at the
bottom?
? I assume it needs a grounding wire?

thank you so much.
--Soula


--- In [hidden email], "culverpratt" <culverpratt@...> wrote:
>
> thanks for writing, Emil! Trying to squeeze in some time here at
> work, where the computer is "safe" ...
>
> Yes, the high field from computer and anything plugged into it
> (headphones, mouse, etc.) still occurs as long as the computer is
> plugged in, whether it is on or off. It is the old-house wiring
that
> is the problem; the grounding is non-functional (in spite of the
> little circuit-testers' evidence to the contrary! -- some
receptacles
> show OK and others do not, but plugging into none of them produces
a
> grounded computer).
>
> I am getting desperate and so am very interested in the shielding
> material idea. There are so many choices at the lessemf.com
website.
> Can someone share what material would be best (cheaper is definelty
a
> factor right now) -- I picture myself in a shroud sitting before my
> computer, wearing special gloves and poking at the keyboard.
>
> But it all has to be grounded as well? How would I achieve that, I
> wonder? With a grounding cord going out the window to an 8-foot rod
> in the ground? Fortunately I am on the first floor, but still such
a problem.
> >
> > If you need to shield electric field from a mouse or keyboard,
> lessemf.com
> > has several shielding fabrics (see high performance mesh and
> veilshield)
> > that can be used to cover a keyboard and/or mouse. They also have
> shielded
> > gloves. Make sure you use a ground cord with electric field
shields.
> >
> > Emil
> > www.lessemf.com
> >
> >
>