The Mask,gas, cataloged under National Stock Number 4240-00-268-9735, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-00-268-9735 |
| Item Name | Mask,gas |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Hose Quantity | 1 |
| Facepiece Design | FULL |
| Canister Identification Color Code | YELLOW |
| Facepiece Size Designation | UNIVERSAL |
| Spectacle Usage Provision | NOT PROVIDED |
| Canister to Facepiece Attachment Method | HOSE |
| Carrying Facility | CARRYING CASE |
| Facepiece Speaking Diaphragm | NOT INCLUDED |
| Carrying Position for Which Designed | CHEST |
| Canister Carrying Harness | INCLUDED |
| Canister Particulate Filter | NOT INCLUDED |
| Material | FIBERBOARD CARRYING CASE |
| Material | GLASS SAFETY FACEPIECE LENS |
| Material | RUBBER HEAD HARNESS |
| Material | RUBBER POLYISOPRENE NATURAL CLASS NR FACEPIECE |
| Canister Automatic Timer | NOT INCLUDED |
| Canister Quantity | 1 |
| Canister Protection for Which Designed | ACID VAPORS AND ORGANIC VAPORS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MILM12309 | 5/9 Secondary reference U.S. Government activity |
| GGG-M-131 | 4/1 Identification reference U.S. Government activity |
NSN 4240-00-268-9735 is a Mask,gas, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-00-268-9735: Hose Quantity: 1; Facepiece Design: FULL; Canister Identification Color Code: YELLOW; Facepiece Size Designation: UNIVERSAL. 18 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
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.