Published · not in PSIPUB-SAFFIRE-IV-VIInvestigation dossier

Saffire IV–VI

Saffire IV–VI large-scale tests (published, not in PSI; 7 of the tests)

Principal investigator: not stated in source
Platform: Cygnus
Hardware: not stated in source
Dates: not stated in source
Licence: not stated in source
Status: published values, not in PSI; shown only when “Include published evidence” is on

Source document (opens in a new tab)ntrs.nasa.gov/citations/20260001992

Evidence proximity, not a safety rating. This page describes what was tested and where each value comes from.

Footprint · Microgravity

Where Saffire IV–VI’s runs sit in condition space, in the Atlas chart window. Other investigations’ runs in this regime are dimmed.

7 of 7 runs drawn.

Source: NASA PSI run tables (snapshot 2026-11-14) and the published papers listed under Sources. Evidence proximity, not a safety rating; not a hazard map.

Objective

No objective text; see the source document.

Fingerprint COMPUTED

Computed from the 7 records below: what varied, what was held constant, and what was never recorded.

Varied

O₂ 22.0–31.0 % · 7 levels · measured
Pressure 54.1–100.0 kPa · 7 levels · measured

Held constant

Flow 20.0 cm/s · measured
flow = 20 cm/s

Not recorded

every row records O₂, pressure and flow

Condition axes: what varied and what was held constant
Axis	State	Range	Basis	Recorded
O₂	varied	22.0–31.0 % · 7 levels	measured	7/7
Pressure	varied	54.1–100.0 kPa · 7 levels	measured	7/7
Flow	held constant	20.0 cm/s	measured	7/7

Placeable: 7 of 7 record O₂ and can be placed (the engine can compute a distance); 7 also record pressure and appear on the charts.
Gravity: Microgravity (7)
Fuel classes: Solid · thin (3) · Solid · thick (2) · Solid · unclassified (2)
Flow regime: regime not recorded (7)
Materials (4): PMMA, 2-sided (1 cm) (2) · PMMA, 1-sided (0.5 cm) (2) · SIBAL fabric, 2-sided (2) · Cotton jersey, 2-sided (1)
Outcomes: not recorded (7)
Measured quantities: time to 2 mg/m³ aerosol [s] (7) · flame-length growth rate [mm/s] (4) · peak HRR (ICES-2024: 3,080 W) [W] (3) · flame spread rate [mm/s] (3) · max CO rise [ppm] (1)
Per-run identifiers: o2 · pressure
Data-quality flags: conflicting-sources × 7: Sources disagree on this value; the alternatives are listed.

Where the runs sit: O₂ × pressure, zoomed to the data

7 of 7 runs record both ambient O₂ and pressure and are plotted.

Microgravity 7 runs

published (not in PSI)
reference atmosphere

Source: the normalized O₂ and pressure of each run in the run table below (NASA PSI run tables or the cited paper); the original cell and any conversion are in each run’s provenance. Reference atmospheres are MARGIN’s presets. Not a hazard map.

Published records

Values transcribed from the paper (published, not a PSI table row), with the source locator and verification state of each record.

Saffire IV–VI: 7 records.

Saffire IV–VI: 7 records. Each value cell shows the normalized value and, beneath it, the original cell as it appears in the source.
Record	Material	Fuel class	g	O₂ %	Pressure kPa	Flow cm/s	Outcome	Flags	Source locator	Verification
IV-2	PMMA, 2-sided (1 cm)	Solid · thick	µg	22.00.22 mol fraction	100.01000 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
V-3	PMMA, 1-sided (0.5 cm)	Solid · unclassified	µg	26.00.26 mol fraction	74.5745 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-3	PMMA, 2-sided (1 cm)	Solid · thick	µg	30.00.3 mol fraction	54.4544 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-4	PMMA, 1-sided (0.5 cm)	Solid · unclassified	µg	29.00.29 mol fraction	55.0550 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
IV-1	SIBAL fabric, 2-sided	Solid · thin	µg	23.00.23 mol fraction	98.0980 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
V-2	Cotton jersey, 2-sided	Solid · thin	µg	28.00.28 mol fraction	74.1741 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-2	SIBAL fabric, 2-sided	Solid · thin	µg	31.00.31 mol fraction	54.1541 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6

Investigation dossier

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Reading the record, its runs and their sources.

Saffire IV–VI

Saffire IV–VI large-scale tests (published, not in PSI; 7 of the tests)

Principal investigator

not stated in source

Platform

Cygnus

Hardware

not stated in source

Dates

not stated in source

Licence

not stated in source

Status

published values, not in PSI; shown only when “Include published evidence” is on

Evidence proximity, not a safety rating. This page describes what was tested and where each value comes from.

Fingerprint COMPUTED

Computed from the 7 records below: what varied, what was held constant, and what was never recorded.

Varied

O₂ 22.0–31.0 % · 7 levels · measured
Pressure 54.1–100.0 kPa · 7 levels · measured

Held constant

Flow 20.0 cm/s · measured
flow = 20 cm/s

Not recorded

every row records O₂, pressure and flow

Condition axes: what varied and what was held constant
Axis	State	Range	Basis	Recorded
O₂	varied	22.0–31.0 % · 7 levels	measured	7/7
Pressure	varied	54.1–100.0 kPa · 7 levels	measured	7/7
Flow	held constant	20.0 cm/s	measured	7/7

Placeable

7 of 7 record O₂ and can be placed (the engine can compute a distance); 7 also record pressure and appear on the charts.

Gravity

Microgravity (7)

Fuel classes

Solid · thin (3) · Solid · thick (2) · Solid · unclassified (2)

Flow regime

regime not recorded (7)

Materials (4)

PMMA, 2-sided (1 cm) (2) · PMMA, 1-sided (0.5 cm) (2) · SIBAL fabric, 2-sided (2) · Cotton jersey, 2-sided (1)

Outcomes

not recorded (7)

Measured quantities

time to 2 mg/m³ aerosol [s] (7) · flame-length growth rate [mm/s] (4) · peak HRR (ICES-2024: 3,080 W) [W] (3) · flame spread rate [mm/s] (3) · max CO rise [ppm] (1)

Per-run identifiers

o2 · pressure

Data-quality flags

conflicting-sources × 7: Sources disagree on this value; the alternatives are listed.

Published records

Values transcribed from the paper (published, not a PSI table row), with the source locator and verification state of each record.

Saffire IV–VI: 7 records.

Saffire IV–VI: 7 records. Each value cell shows the normalized value and, beneath it, the original cell as it appears in the source.
Record	Material	Fuel class	g	O₂ %	Pressure kPa	Flow cm/s	Outcome	Flags	Source locator	Verification
IV-2	PMMA, 2-sided (1 cm)	Solid · thick	µg	22.00.22 mol fraction	100.01000 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
V-3	PMMA, 1-sided (0.5 cm)	Solid · unclassified	µg	26.00.26 mol fraction	74.5745 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-3	PMMA, 2-sided (1 cm)	Solid · thick	µg	30.00.3 mol fraction	54.4544 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-4	PMMA, 1-sided (0.5 cm)	Solid · unclassified	µg	29.00.29 mol fraction	55.0550 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
IV-1	SIBAL fabric, 2-sided	Solid · thin	µg	23.00.23 mol fraction	98.0980 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
V-2	Cotton jersey, 2-sided	Solid · thin	µg	28.00.28 mol fraction	74.1741 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6
VI-2	SIBAL fabric, 2-sided	Solid · thin	µg	31.00.31 mol fraction	54.1541 mbar	20.020 cm/s	not recorded	conflicting-sources	Urban et al., ICES-2026-577 (NTRS 20260001992) · Table 1, p. 6“All samples were 40 cm wide in 20 cm/s opposed flow.”	PUBLISHEDchecked against primary source · Table 1, p. 6