One of the major challenges in working with LNG (liquefied natural gas) is transporting it. LNG is stored and transferred at cryogenic temperatures - which can be a major challenge when it comes to designing seals.

Polymer seals that can handle cryogenic temperatures are needed anytime LNG is transported or transferred, and can involve complex mechanisms such as valves, swivels, connectors, etc. In this blog post we are going to focus on the challenges specific to MLAs, or marine loading arms.

PCTFE is a fluoropolymer highly appreciated for its properties of very low gas permeability, chemical stability and low-temperature resistance. It is therefore a material of choice in industrial sectors such as aeronautics, cryogenics, and valve equipment manufacturers. The most common trade name is KEL-F but 3M has discontinued the production of KEL-F in 1996 and the Voltalef of Arkema is now the most common.

PCTFE or polychlorotrifluoroethylene is processed by compression molding or extrusion. This high-performance polymer is a fluorinated polymer close to PTFE with an additional chlorine atom, responsible for the low melt index. It is characterized by its high level of tensile strength and creep resistance. PCTFE also has excellent mechanical properties at cryogenic temperatures.