1. Polymer-impregnated Portland cement mortars
2. ASTM D - 257, 92 Standard Test for DC Resistance or conductance of insulating material.
3. ASTM D - 495, 89 Standard Test for High Voltage, Low Current, Dry ARC Resistance of Solid Electrical insulation.
4. IEC-112, 79 Method of determining the comparative and proof tracking indices.