The Desiccant Container,dehumidifier, cataloged under National Stock Number 4440-01-485-8740, is classified within Federal Supply Class 4440 (Driers, Dehydrators, and Anhydrators) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Drytech Inc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4440-01-485-8740 |
| Primary Part Number | 1DT9900 |
| Item Name | Desiccant Container,dehumidifier |
| FSC / FSG | 4440 / 44 — Driers, Dehydrators, and Anhydrators |
| Manufacturer | Drytech Inc |
| Status | ACTIVE |
| Desiccant Material | MOLECULAR SIEVE,TYPE 4A,8X12 MESH BEADS HAVING PARTICLE DIAMETER OF 0.0661 TO 0.0937;15 PERCENT IS INDICATING BEADS;FORMULA NA2OAL2O3SIO2 A |
| Supplementary Features | DISPOSE OF BEADS WHEN DESICCANT IS AT 75 PERCENT ABSORPTION LEVEL;CONTAINS ALUMINUM OXIDE WHICH IS TOXIC,WEAR RESPIRATORY EQUIPMENT AND PROTECTIVE GLOVES AND GOGGLES WHILE HANDLING |
| Material | ALUMINUM AND PLASTIC ACRYLIC CONTAINER |
| Desiccant | NOT INCLUDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1DT9900 PRIMARY | Drytech Inc (USA) |
| ES9959 ITEM 2 | Drs Sustainment Systems, Inc. (USA) |
NSN 4440-01-485-8740 is a Desiccant Container,dehumidifier, manufactured by Drytech Inc, classified under FSC 4440, Driers, Dehydrators, and Anhydrators. Status: active.
NSN 4440-01-485-8740 has 2 manufacturer part numbers on file: 1DT9900 (Drytech Inc), ES9959 ITEM 2 (Drs Sustainment Systems, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4440-01-606-8731. Verify interchangeability with system specifications before substitution.
Key specifications for 1DT9900: Desiccant Material: MOLECULAR SIEVE,TYPE 4A,8X12 MESH BEADS HAVING PARTICLE DIAMETER OF 0.0661 TO 0.0937;15 PERCENT IS INDICATING BEADS;FORMULA NA2OAL2O3SIO2 A; Supplementary Features: DISPOSE OF BEADS WHEN DESICCANT IS AT 75 PERCENT ABSORPTION LEVEL;CONTAINS ALUMINUM OXIDE WHICH IS TOXIC,WEAR RESPIRATORY EQUIPMENT AND PROTECTIVE GLOVES AND GOGGLES WHILE HANDLING; Overall Length: 5.770 INCHES MINIMUM AND 5.920 INCHES MAXIMUM IN; Special Features: OPERATING PRESSURE 50PSIG;OPERATING TEMP IS -65 TO +71 DEGREES C. 4 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.