Which material shall NOT be used for upper and lower casings of regulators?

The use of non-metallic parts for the upper and lower casings of regulators is not advisable due to their potential vulnerability under various conditions. Regulators are critical components in propane systems, responsible for controlling the flow and pressure of gas. Materials used in their construction must withstand the mechanical stresses, temperature variations, and potential exposure to chemicals that may occur in a propane environment.

Non-metallic materials might lack the necessary strength and resilience compared to metal or other more robust materials. They can deteriorate more quickly, leading to failures that compromise safety. In contrast, materials such as metal cladding, plastic parts, and composite materials can be engineered to offer the required durability and resistance while maintaining safety standards. This makes them more suitable for use in regulators, ensuring they can operate effectively and safely over time.