Industrieverband langlebige Kunststoffprodukte und Mehrwegsysteme e. V.
Fachwissen Application of PTFE-polymers in oxygen systems
pro-K Fachgruppe

Technical brochure 3.1

Stand: September 2020

Polytetrafluorethylene (PTFE) is a high performance polymer. Due to its unique properties PTFE has become an indispensable material in modern industrial society.

Among the outstanding properties of PTFE, the high chemical resistance, the broad service range, the excellent dielectric properties, the ageing resistance, the resistance to embrittlement and high purity have to be mentioned.

Due to their outstanding properties PTFE, modified PTFE and PTFE compounds are preferred materials in system engineering where complex regulations require high compatibility i.e. compliance with regulations for the contact with oxygen, food or potable water.

Apart from the selection of the appropriate and suitable materials, system and regulatory requirements in high-grade application have to be taken into account and to be considered when starting a new project. For this reason, the complex sets of rules are increasingly the focus of high-quality system engineering applications.

This brochure is addressed to all processors of PTFE and contains a lot of information about the use of PTFE in oxygen facilities.

This technical brochure is edited by the pro-K fluoropolymergroup and was elaborated by Mr. Stefan Ebmeyer, Dyneon GmbH & Co. KG in 2006. The present brochure was revised in collaboration with the "BAM" (Bundesanstalt für Materialforschung und- prüfung) and represents our knowledge as of October 2018.

Table of contents

1. PTFE and PTFE-compounds in oxygen systems

1.1 Oxygen in pressurised gas-systems

1.2 Regulation under the regulatory framework "Technische Regeln für Gefahrstoffe TRGS 407“ of the "Bundesanstalt für Arbeitsschutz und Arbeitsmedizin" (BAuA)

1.3 BAM test procedures for sealing materials

1.3.1 Ignition temperature in compressed oxygen

1.3.2 Resistance to ageing in compressed oxygen

1.3.3 Impact of oxygen pressure shocks

1.3.4 Reactivity with fluid oxygen under impact stress

1.3.5 Testing of flat gaskets for flange connections

1.3.6 Assessment of materials

1.4 PTFE and PTFE-compounds for use in contact with oxygen

1.5 List of non-metallic materials

1.6 Safety related assessment of finished articles for use in contact with oxygen

1.7 Bundesanstalt für Materialforschung und -prüfung (BAM)