As a follow-up, the wiki article on microphones has a confused description of "permanently embedded static electric charge (which, due to the high resistance and chemical stability of the material,..." But then they talk about dipolar alignment, which is not the same thing as a static charge. The decay of dipolar alignment has nothing to do with high resistance. It depends on how easily the polymer chains can re-orient. On the other hand, decay of a static charge would depend on resistance. So, which is it?