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2. Resistivity
2.1 Definitions
Since dielectric polymers are mainly used as insulators, they must have good resistivity. It is therefore important to understand the conductivity mechanisms that may be involved, and to predict the effects of various factors such as temperature variations or the presence of impurities.
A distinction is made between the transverse resistivity ρ, which is defined by the relationship :
ρ = R S/e
with :
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Resistivity
Dielectric strength
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Standard Test Method for Relative Permittivity (Dielectric Constant) and Dissipation Factor of Polymer-Based Microwave Circuit Substrates http://www.astm.org/Standards/D3380.htm
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