Sulfur Hexafluoride (SF₆) — Electrical Insulating Gas

Linde plc (NYSE/FWB: LIN; HQ Dublin, Ireland; operational HQ Guildford UK; ~$32B revenue 2023) is the world's largest industrial gas company. Linde owns and operates one of the two largest liquid oxygen cryogenic tanker fleets globally — thousands of vacuum-insulated trailers delivering LOX to hospitals, steel mills, chemical plants, and semiconductor fabs in 80+ countries. Linde does not primarily manufacture its own tankers (purchases from Chart Industries and other OEMs) but specifies custom vacuum-insulated designs for its fleet. Linde's medical oxygen business (hospital LOX supply) is the dominant fleet use case. Linde also supplies liquid oxygen rocket propellant to aerospace customers including NASA and commercial launch operators.

Major SF6 and fluorinated gas producer; global distribution for power grid applications; also developing SF6 alternatives for switchgear transition

American industrial gas and hydrogen infrastructure company (NYSE: APD, HQ Allentown PA; ~$12B revenue); world's 3rd-largest industrial gas company and the leading investor in large-scale green hydrogen projects globally. Air Products produces industrial gases (oxygen, nitrogen, hydrogen, helium) globally and is the operator of several major helium liquefaction plants (including facilities in Wyoming and internationally). Air Products' NEOM clean hydrogen project in Saudi Arabia (joint venture with ACWA Power and NEOM company) — the world's largest planned green hydrogen production facility — will produce green hydrogen (from solar/wind electrolysis) exported as ammonia and ultimately reconverted to hydrogen in global markets. Air Products is the one major industrial gas company most committed to the 'hydrogen economy' vision — its CEO Seifi Ghasemi has publicly stated that Air Products would transform from an industrial gas company into a clean hydrogen infrastructure company. The same company that provides helium to hospital MRI machines is simultaneously building the largest green hydrogen plant on Earth in the Saudi desert.

Japanese specialty chemicals; key disilane producer for semiconductor CVD; high-purity Si2H6 for NAND flash and logic ICs; also building US silane facility JV with SK Materials

Japanese specialty fluorine chemicals company (TSE: 4286, HQ Sōja, Gunma; ~¥70B revenue); one of Japan's two dominant LiPF6 (lithium hexafluorophosphate) producers alongside Stella Chemifa, together producing approximately 25-30% of global LiPF6. Kanto Denka's LiPF6 synthesis route uses high-purity HF and phosphorus pentafluoride (PF5) in anhydrous conditions — a highly moisture-sensitive synthesis requiring specialized chemical manufacturing infrastructure. Kanto Denka also produces SF6 (sulfur hexafluoride, used as a dielectric insulating gas in high-voltage electrical switchgear), ClF3 (chlorine trifluoride, used in semiconductor chamber cleaning), and electronic-grade fluorine gases for semiconductor manufacturing — one Japanese specialty chemicals company supplying both the semiconductor fab and the EV battery supply chain from the same fluorine chemistry platform.

US specialty gas distributor and producer; subsidiary of Taiyo Nippon Sanso; SF6 supply to US electrical utilities and switchgear manufacturers