Electromagnetic radiation shielding composites and method of production thereof

A method of preparing an electromagnetic radiation shielding composite which exhibits high conductivity and low resistance comprising:

• providing a composite comprising an electrically conductive material dispersed within a matrix material;
• and
• applying an electrical potential difference across said composite such that a first and at least one additional electrical potential difference are applied across said composite, each said potential difference being greater than the potential difference which precedes it and each said additional potential difference which is applied being of such a value so as to increase the conductivity of said composite in comparison to that which said composite exhibits prior to applying said additional electrical potential difference, said electrical potential differences being applied a sufficient number of times and increased to such a value so that the conductivity of the composite no longer increases, thereafter passing an electrical current through the composite of sufficient magnitude to further increase the conductivity of the composite while maintaining the electrical potential difference at a value which does not exceed the value of the highest electrical potential difference previously applied, said electrical current being of a value greater than the value of any current which previously passed through the composite during application of said electrical potential difference.