Composite cylinders are made from a combination of which materials?

• A. Fiberglass or carbon fibers and a plastic resin
• B. Aluminum and steel
• C. Wood and ceramic
• D. Glass fibers and epoxy

Answer: (A)

Composite cylinders rely on a combination of reinforcement fibers and a resin matrix. The fibers—typically fiberglass or carbon fibers—provide the high strength and stiffness needed to withstand high pressures. The plastic resin binds those fibers together and, with a polymer inner liner, forms a gas-tight, durable pressure vessel. This combination creates a strong, lightweight cylinder ideal for propane storage compared with traditional metal cylinders. While glass fibers with epoxy would also be a type of composite, the broader description of fiberglass or carbon fibers with a plastic resin best captures the standard materials used across these cylinders, which is why it’s the best choice. The other options describe materials that don’t match how composite propane cylinders are typically constructed.