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Quality of Breathing Gases at Fill ExpressAt Fill Express, we describe our breathing gases as Ultra Pure. On this page, we provide the information to substantiate that statement. Each quarter a certified independent testing laboratory tests gases at Fill Express. The information that follows describes the tests they perform and the quality of breathing gases at Fill Express. You may also examine a recent test report. |
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| Links on this page: Breathing Gas Quality | |
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| Parts Per Million | Gas Standard or Test Result |
| 1,000 ppm | Allowed maximum for CGA G-7.1 Grade "E" |
| Less than 1000 ppm | Test results for Fill Express gases |
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| Parts Per Million | Gas Standard or Test Result |
| 10 ppm | Allowed maximum for CGA G-7.1 Grade "E" |
| 2 ppm | Maximum for IANTD "Oxygen-Compatible" |
| Less than 0.3 ppm | Test results for Fill Express gases |
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| Milligrams Per Cubic Meter |
Gas Standard or Test Result |
| 5 mg/m3 | Allowed maximum for CGA G-7.1 Grade "E" |
| 0.1 mg/m3 | Allowed maximum for IANTD "Oxygen-Compatible" |
| Less than 0.02 mg/m3 | Test results for Fill Express gases |
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| Parts Per Million | Gas Standard or Test Result |
| 25 ppm | Allowed maximum for CGA G-7.1 Grade "E" |
| Less than 1 ppm | Test results for Fill Express gases, excluding methane |
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| Parts Per Million/ Dew Point |
Gas Standard or Test Result |
| 24 ppm/-65 °F | Allowed maximum for CGA G-7.1 Grade "E" |
| 7 ppm/-81 °F | Allowed maximum for mil-spec Aviators Breathing Oxygen (ABO), a reasonable benchmark for acceptable H2O content in breathing gases for SCUBA diving. |
| Less than 7 ppm/-81 °F | Test results for Fill Express gases |
| Note that whereas the difference between 24 ppm H2O and 7 ppm H2O may be significant to SCUBA equipment, it's extremely unlikely that humans can detect a difference during respiration. Regardless of the precise water content, any compressed breathing gas for SCUBA is going to seem very dry when inspired from the second stage of a SCUBA regulator. |
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