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Standard white Teflon tape is not rated for natural gas or propane. It degrades on contact with hydrocarbons over time. The International Fuel Gas Code (IFGC) Section 403.9.2 specifies that only listed sealants — yellow gas-rated PTFE tape or anaerobic pipe dope rated for gas — may be used on threaded gas connections. Some jurisdictions require dope only, no tape. Check your local AHJ.
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