What material is NOT typically used for fabricating CNG cylinders?

The reason wood is not typically used for fabricating CNG cylinders lies in the fundamental requirements for materials in high-pressure applications. CNG cylinders must withstand significant pressure—often up to 3,600 psi—without deforming or failing. Materials used for these cylinders must have high strength-to-weight ratios, resistance to corrosion, and the ability to handle temperature variations without compromising structural integrity.

Steel and aluminum, both of which have very high strength and durability, are common choices for CNG cylinders. Composite materials, often including fiberglass or carbon fiber, are also utilized for their lightweight properties and high resistance to corrosion, making them suitable for high-pressure applications. Wood, on the other hand, cannot meet the critical performance requirements necessary for containing compressed natural gas. It lacks both the strength and the non-permeable properties needed to safely store gas at high pressures, making it unsuitable for this purpose. Thus, it is not a viable option in the manufacturing of CNG cylinders.