The primary difference lies in their specific industrial applications, material thickness, and regulatory certifications. Yellow Teflon tape is thicker, heavier, and specifically engineered and certified for use on gas lines, including natural gas, propane, and butane connections. Blue Teflon tape, on the other hand, is typically an industrial-grade specialized tape used in oxygen systems, high-purity fluid processing, or specific commercial plumbing applications requiring distinct color coding or high chemical resistance. For standard residential water lines, pink or white tape is used, while yellow is reserved strictly for gas applications.
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