Has the Hydrogen Safety Panel had inquiries about metal mesh or polymer foam being used in composite or metal containers for hydrogen use as an explosion prevention system in accordance with NFPA 69?

The Panel has not received such inquiries. Section 14.2 of NFPA 69 Standard for Explosion Prevention Systems covers foam and mesh requirements. NFPA 69 states in 14.3.4 that the tests shall be conducted with a flammable gas/air mixture with a fundamental burning velocity representative of the burning velocities of flammable vapors expected in the intended applications.