Which of the following materials is NOT suitable for an LP gas line?

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The correct selection of materials for an LP gas line is critical to ensure both safety and compliance with industry standards. Cast iron is not suitable for LP gas lines primarily because it is prone to brittleness and can crack under stress. In addition, cast iron joints may not provide the necessary sealing capabilities that prevent gas leakage, which is essential in maintaining safe gas transport.

In contrast, materials such as polyethylene, copper, and steel are widely accepted for LP gas lines. Polyethylene is commonly used, especially for underground gas distribution, due to its flexibility, resistance to corrosion, and ability to withstand various soil conditions. Copper is favored for its durability and ease of installation, allowing for reliable connections and long-term performance. Steel offers high strength and is suitable for use in pressurized systems.

When determining which material to use for LP gas lines, safety, material properties, and local codes are essential factors to consider, which underscores why cast iron is inappropriate for this application.

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