Historical
DIN EN 751-3:1997
Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes (including Corrigendum AC:1997)
This document deals with requirements and tests of unsintered PTFE tapes for metallic threaded joints comming in contact with 1st, 2nd, and 3rd family combustible gases and hot water of heating systems.
Deutsches Institut für Normung [din]