The ISPE Good Practice Guide: Process Gases, Second Edition presents recent advances in construction materials and updates on current good practices. This edition is aligned with the latest regulatory guidance, including EU Annex 1 (revised 2022), EU Annex 15, the FDA Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing — Current Good Manufacturing Practice, and the FDA draft Guidance for Industry: Current Good Manufacturing Practice for Medical Gases.