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krypton (Kr), chemical element, a rare gas of Group 18 (noble gases) of the periodic table, which forms relatively few chemical compounds. About three times heavier than air, krypton is colourless, odourless, tasteless, and monatomic.
| Kr | ≥99.999% | ≥99.999% | ||||||||
| H2O | ≤3.0 ppm | 0.9 ppm | ||||||||
| O2 | ≤2.0 ppm | 0.04 ppm | ||||||||
| Ar | ≤1.0 ppm | ≤0.03 ppm | ||||||||
| H2 | ≤1.0 ppm | ≤0.03 ppm | ||||||||
| N2 | ≤3.0 ppm | ≤0.03 ppm | ||||||||
| Xe | ≤2.0 ppm | ≤0.03 ppm | ||||||||
| CO2 | ≤0.5 ppm | ≤0.03 ppm | ||||||||
| THC as CH4 | ≤2.0 ppm | ≤0.01ppm | ||||||||
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