Yes, Fonnov manufactures the aluminum alloys 6061-H112 and 6061-F for large-diameter seamless tube for hydrogen fuel vehicles with the harsh working conditions of hydrogen fuel vehicle applications in mind. Hydrogen fuel vehicles often operate in unpredictable environments with the dangers of extreme conditions.  Owing to its strain-hardened state, 6061-H112 has the right mechanical properties to withstand these conditions. The 6061-F aluminum is equally suitable for these applications.