Everbuild Mammoth PTFE gas tape is a non-adhesive tape for use with threaded fittings and compression joints on all types of gas pipes, including natural gas and liquid carrying pipework, including potable water. For use with BS 21 threads up to 2 in. Satisfies BG C IM/16, BS6974: 1989 and BS5292 Type C tests. Non Flammable (ASTM D-653 – D470)