Which material is NOT acceptable for use under service conditions for container appurtenances for LP Gas?

The use of materials in the construction of container appurtenances for LP Gas is crucial for safety and effectiveness. Cast iron, while a strong material, is not considered acceptable for this purpose under service conditions. This is primarily due to its brittleness and tendency to crack under stress or impact, which can pose severe risks in scenarios involving high pressures and potential changes in temperature.

Unlike cast iron, steel and aluminum are preferred materials for appurtenances as they have greater ductility and resistance to corrosion. Additionally, plastic may be used in certain applications if it meets specific safety and performance standards, typically in low-pressure environments. However, for high-pressure systems like those used for LP Gas, cast iron’s properties make it unsuitable. Thus, the correct answer highlights the importance of selecting materials that ensure the safety and reliability of propane containment and delivery systems.