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| gas composition | concentration (%) | factory |
|---|---|---|
| N2 | 99.999 | Beijing Puxi General Instrument Co., Ltd. |
| Ar | 99.2 | Beijing Puxi General Instrument Co., Ltd. |
| H2 | 99.999 | Beijing Puxi General Instrument Co., Ltd. |
| Dry air | Beijing Puxi General Instrument Co., Ltd. | |
| Standard gas | H2—15.0%; CO—15.0%; CO2—20.0%; CH4—10.1%; N2—39.9% | Foshan Ke Di Co., Ltd. |
