The Propellant Pressurizing Agent,he, cataloged under National Stock Number 9135-01-665-9490, is classified within Federal Supply Class 9135 (Liquid Propellant Fuels and Oxidizers, Chemical Base) of the Fuels, Lubricants, Oils, and Waxes group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9135-01-665-9490 |
| Item Name | Propellant Pressurizing Agent,he |
| FSC / FSG | 9135 / 91 — Liquid Propellant Fuels and Oxidizers, Chemical Base |
| Status | ACTIVE |
| Supply Classification | BULK |
| Composition and Percentage | 99.995 MINIMUM BY VOLUME HELIUM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Hazardous per DLA record (HMIC D) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| M27407-1A BULK (OCONUS) | 2/2 Government specification standardization U.S. Government activity |
| MIL-PRF-27407 TYPE I GRADE A | 5/9 Secondary reference U.S. Government activity |
| MIL-PRF-27407 | 4/1 Identification reference U.S. Government activity |
NSN 9135-01-665-9490 is a Propellant Pressurizing Agent,he, classified under FSC 9135, Liquid Propellant Fuels and Oxidizers, Chemical Base. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 9135-01-665-9887, 9135-01-665-9904. Verify interchangeability with system specifications before substitution.
Key specifications for 9135-01-665-9490: Supply Classification: BULK; Composition and Percentage: 99.995 MINIMUM BY VOLUME HELIUM; Special Features: DFSC DISTRIBUTION PLAN/CONTACT BULLETIN AND SPECIAL PROCUREMENT PROGRAMS;. 2 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC D). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 9135-01-665-9490 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.