What material should the fittings or connectors of the hose be made of?

The fittings or connectors of the hose used in compressed natural gas (CNG) systems are best made from Type 304 or better stainless steel due to its superior corrosion resistance, durability, and strength. Type 304 stainless steel is an alloy primarily composed of iron, chromium, and nickel, making it highly resistant to oxidation and corrosion. These properties are crucial when dealing with CNG since the system operates under high pressures and varying temperatures, which can promote the corrosion and degradation of weaker materials.

Using materials such as plastic, aluminum, or magnesium for hose fittings or connectors is less desirable in this context. While plastic with UV coating may provide some resistance to environmental factors, it lacks the mechanical strength and resistance to high pressures that stainless steel offers. Although aluminum can be lightweight, its susceptibility to corrosion under varying conditions could compromise the integrity of the connection. Magnesium, although lightweight, is less robust and more prone to corrosion than stainless steel, making it unsuitable for applications involving high-pressure gases like CNG.

Hence, selecting Type 304 or better stainless steel for fittings ensures safety and reliability in the long-term performance of CNG systems.