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Ptfe thread sealant tape colors. since many state and local codes adopted the use of double density tapes when making connections for natural gas, the use of same color for two different thickness presented a challenge when time came to inspect a job. thus, a “yellow teflon tape” was later introduced for such application. since then, astm ...
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The white is considered single density. there evidently is a red type also, that is triple density. the red tape is for large diameter pipe, 2" and above. (i've never seen that). the white is rated for something less than 10,000-lbs. the yellow is rated for -500*f. the white is rated for