ÖNORM EN 751-3

This European Standard specifies requirements and test methods for unsintered polytetrafluorethylene (PTFE) tapes (PTFE tapes, for short) which are suitable for sealing threaded metallic joints as specified in ISO 7-1. This European Standard Covers two classes of PTFE tapes suitable for fine (F) and coarse (G) threads. The PTFE tapes are typically for use in installations for Ist family gases (town gas), 2nd family gases (natural gas) and 3rd family gases (liquefied petroleum gases (LPG)) up to 5 bar, up to 7 bar for hot water of heating Systems, and up to 0,2 bar in gas appliances and their auxiliary equipment. The maximum working pressure covered in this European Standard is 20 bar which is relevant to LPG storage. The temperature range is limited to -20 "C to 125 "C. NOTE: For applications outside the scope of this standard (e.g. compressed gases), the purchaser should consult the manufacturer. Anaerobic jointing compounds are covered by EN 751 -1, non-hardening sealing materials (e.g. in the form of jointing compound paste) are covered by EN 751-2.