Can the material demron protect against concentrated microwave 
or emf surges or reduce effects of same?

Newspaper story:
http://news.bbc.co.uk/2/hi/science/nature/2478465.stm


Patent application for Demron
http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1
&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220020043631%22.PGNR.&O
S=DN/20020043631&RS=DN/20020043631


Claim
DemronTM  suits are constructed from a unique nanotechnology that far
surpasses the effectiveness (or ineffectiveness) of current
nuclear-biological-chemical (NBC) suits that only protect against radioactive
particulate sources.
http://www.radshield.com/

Conclusion:

There are no measurment to support the claims.

The terms and sxpression in claims and publicity articles sounds like a
pseudo-science, for example

"radioactive particulate sources" 

I would not spend money on it.

Any material will 'reduce the effects'.  Issue is : 

Is the ratio od density to protection any better for this material
then for any other.

By density we mean the mass per volume. Lead has high density.

Any metal will shield microwave or emf and will be more effective (per
unit od mass) then  polymer (which Demron claims to be).

Hedgie

Didn't just give a link. Gave a contrarian 
opinion to the hype. I will look for other views.
Hey, the guy gave me something to go on.

Actually, there *are* published (if you accept conference proceedings
as "published") measurements to support at least some of the claims
made for Demron.

Both Batelle Pacific Northwest National Labpratory and Lawrence
Livermore National Laboratory (LLNL) have made measurements of the
attenuation of photons (x-rays and gamma rays), as well as electrons
(beta particles) of Demron and compared these results to other
standard radiation shielding materials.  These reports are available
at the manufacturer's website at
http://www.radshield.com/research_results.cfm.  The LLNL report formed
the basis for a conference paper and presentation at the 2003 American
Nuclear Society meeting in San Diego (paper also available at the
above URL, and also at the LLNL on-line library at
http://www.llnl.gov/tid/lof/documents/pdf/246495.pdf).

The bottom line is that the radiation-attenuation characteristics of
Demron are very similar to those of the element tantalum.  Plots of
the mass attenuation coefficients as a function of energy for these
two materials are very similar.

...continuation of previous comment

All that having been said, the your question asked about shielding
microwave radiation and the electric fields associated with an EMP. 
Unless Demron is a good electrical conductor (and it doesn't seem like
this is the case), it will not be particularly effective at shielding
these types of sources.  Attenuation of microwave radiation in
materials occurs by very different mechanisms than does attenuation of
higher energy photons and electrons.