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Mill-Rose full-density green thread seal tape is over five times heavier than common sealing tapes so you can use it and never worry about contaminating systems. Because it is degreased, it has no residual lubricant, unlike common tapes made with petroleum as a lubricant. Specifically developed for oxygen installations, green thread seal tape is both safe and reliable to use it is chemically inert and won't support combustion.
Cleanfit 70850 Tape, 0.0045 in Thick, 1/2 in W, 260 in L, Green