G2 Gas Fitter Practice Exam 2025 - Free Gas Fitter Practice Questions and Study Guide

The recommended gasket material for use in gas or propane systems is neoprene. Neoprene is known for its excellent resistance to degradation caused by the elements commonly encountered in gas and propane systems, including heat, oil, and ozone. It maintains its flexibility and sealing properties over a wide temperature range and provides a reliable seal to prevent leaks.

In contrast, other materials may not offer the same level of performance. Rubber, while it may be suitable in various applications, lacks the chemical and temperature resistance that neoprene provides, making it less effective in gas systems. Metal gaskets may be used in certain high-pressure applications, but they typically do not compress well and might not provide a proper seal for gas or propane. Silicone is often used in applications involving higher temperatures or specific food-grade materials, but it is generally not recommended for gas and propane systems due to its susceptibility to hardening and loss of sealing effectiveness over time when exposed to gases.