Marquest Recomendation: This tape is very good when sealing threads that are exposed to Mineral Oil, Halocarbon Oil, & Silcone Oil. 2-3 wraps of this tape prevents "wicking" from occuring and subsequent leaking of the threaded joint. Mill-Rose Stainless Steel Thread Sealing PTFE Tape is a unique thread sealing tape which prevents stainless steel fittings from galling or seizing during assembly and disassembly. The tape is thicker (.0045" +/-10% and denser (2.50/grams/cubic centimeter +/-110%) than most tapes. The added thickness and density also ensures an effective seal up to 12,000 PSI.