- Air Liquide
- Air Products and Chemicals Inc.
- Airgas Inc.
- American Gas
- BASF SE
- Buzwair Industrial Gases Factories
- Gulf Cryo
- ITM Power
- Linde
- Messer
- Praxair Technology Inc.
- Ras Gas Company Limited
- Royal Dutch Shell PLC
- Taiyo Nippon Sanso