The Reference Standard,physical Prop, cataloged under National Stock Number 6635-01-609-4456, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. The manufacturer of record is United Western Technologies Corp.. The record lists 1 manufacturer part number 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.
| Item Name | Reference Standard,physical Prop |
| FSC / FSG | 6635 — Physical Properties Testing and Inspection (FSG 66) |
| Manufacturers | United Western Technologies Corp. (CAGE 51294) |
| Parameter | Value |
|---|---|
| NSN | 6635-01-609-4456 |
| Primary Part Number | 99891 |
| Item Name | Reference Standard,physical Prop |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| Manufacturer | United Western Technologies Corp. |
| Status | ACTIVE |
| 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 |
|---|---|
| 99891 PRIMARY | United Western Technologies Corp. (USA) |
NSN 6635-01-609-4456 is a Reference Standard,physical Prop, manufactured by United Western Technologies Corp., classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
NSN 6635-01-609-4456 has 1 manufacturer part number on file: 99891 (United Western Technologies Corp.).
1 possible match (shared part number, not a government interchangeability claim): 5970-01-698-1643. Verify interchangeability with system specifications before substitution.
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.