Which types of materials does Nicor use for gas services?

The use of materials for gas services by Nicor typically includes various types that are specifically chosen for their durability, flexibility, and safety in gas transmission. The correct answer highlights Extrube (which may refer to specific forms of piping or materials designed for gas applications), Copper, Steel, PAC (Polymer Arc Coating or similar advanced materials), and PE (Polyethylene).

These materials are widely recognized throughout the industry for their ability to withstand the pressures and conditions associated with natural gas distribution. Steel and PE are especially important, as they are commonly used in pipelines due to their strength, resistance to corrosion (in the case of PE), and suitability for underground installations.

Other choices contain materials that are either not standard in gas services or do not have the necessary characteristics required for safely handling gas. For example, rubber and glass are not typically used in gas pipeline applications due to issues such as durability and the potential for breakage or degradation over time. Therefore, the selection of materials in option B reflects the practices and standards utilized by Nicor in providing safe and efficient gas services.