Merco Threadmaster® PTFE sealant tape is for those applications that require the sealing properties of a premium grade thread sealant. This thread sealant is intended to be used for general purpose sealing in pipe threads. This premium grade regular density PTFE sealant tape permits quick, clean economical sealing of male pipe threads of all sizes and reduces the risk of system contamination common with liquid and paste sealants. Ideal for general plumbing, OEM, MRO, jan/san, industrial and industrial maintenance supply houses. The self-lubricating quality of this unsintered PTFE (Polytetrafluoroethylene) tape makes joints easy to assemble and disassemble, and extends the fatigue life of the sealed connection. Totally maintenance free premium grade high density PTFE thread sealant tape is virtually chemically inert, non-toxic and nonflammable. It will withstand temperatures from -450 to 550 degree F. Its 10 years shelf life allows prewrapping and storage of threaded parts. Specific gravity: 1.2 grams per cubic centimeter. 50 Percent elongation. Meets mil spec T-27730A, and Made in the USA..