Atlas / PMMA film · opposed flow
BASS-II test B21
1-cm-wide, 200-µm-thick PMMA, opposed flow, microgravity (ISS, Microgravity Science Glovebox). Principal investigator: Bhattacharjee. Listed date 2014-08-04
Quenched as flow was reduced
Conditions and sample
- Oxygen
- 19.8 % by volumeRecorded for this testTaken from NASA's 'Calibrated initial O2 vol%' column.
- Airflow as recorded
- 5 down to extinction (changed during the test)Recorded for this test
- Starting airflow
- 5 cm/sDerived by MicroFire AtlasFirst value of the 'Air display' column (air velocity transducer, cm/s). Later 'pot' values are fan potentiometer settings, not velocities, and are not converted.
- Pressure
- 99.2–99.5 kPaStated for the whole test series: “The total pressure is also monitored, which varied from 99.2 to 99.5 kPa in the tests reported.” BASS-II Summary Report, §2.3.5, PDF p. 46Series-level range from the Bhattacharjee report section; not a per-test reading.
- Thickness
- 0.2 mmRecorded for this test
- Width
- 10 mmRecorded for this test
- Exposed length
- Not statedNot stated in the source
- Outcome code
- Quenched as flow was reducedDerived by MicroFire AtlasCoded by MicroFire Atlas from the verbatim observations column.
What the crew and ground team wrote
“Ignition at 5 cm/s then fan pot turned down slowly after flame; spreads halfway; flame goes out at 0.355 pot setting”
Gas readings before and after the burn
| Initial | Final | |
|---|---|---|
| O₂, vol % | 19.8 | 19.6 |
| CO₂, vol % | 0.36 | 0.44 |
| CO, ppm | -1 | 18 |
Readings of the glovebox work volume, from NASA's table columns. They describe the enclosure, not the flame.