These compounds have a resistivity

These compounds have a resistivity in the region of lO^'-lO^^ ^/sq and are
designed for use where slow and controlled dissipation of static charges is
required. EMI shielding compounds, for protection of electronic components
from electrostatic discharge, offer a surface resistivity of lower than 10^' ^/sq,
with volume resistivity of lower than 1 Q cm and up to 5 5 dB attenuation.
Compounds dissipate a surface charge and can be processed by normal
thermoplastic methods. Typical applications are boxes and in-plant handling
containers for electronic components or chemicals where there is a risk of
explosion from a spark. Medical products also increasingly have ESD
specification, especially for use in an operating theatre. Packaging products such
as flexible films also require some form of anti-static treatment, either by means
of an additive, or by using external field generators.
11.4 EMI