The Filter Unit,microporous, cataloged under National Stock Number 6640-01-581-0991, is classified within Federal Supply Class 6640 (Laboratory Equipment and Supplies) of the Instruments and Laboratory Equipment group. The manufacturer of record is Tsi Incorporated. 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.
| Parameter | Value |
|---|---|
| NSN | 6640-01-581-0991 |
| Primary Part Number | 3302A |
| Item Name | Filter Unit,microporous |
| FSC / FSG | 6640 / 66 — Laboratory Equipment and Supplies |
| Manufacturer | Tsi Incorporated |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 3302A PRIMARY | Tsi Incorporated (USA) |
NSN 6640-01-581-0991 is a Filter Unit,microporous, manufactured by Tsi Incorporated, classified under FSC 6640, Laboratory Equipment and Supplies. Status: active.
NSN 6640-01-581-0991 has 1 manufacturer part number on file: 3302A (Tsi Incorporated).
1 possible match (shared part number, not a government interchangeability claim): 6610-01-721-8541. Verify interchangeability with system specifications before substitution.
Key specifications for 3302A: Part Name Assigned by Controlling Agency: ANALYZER, AEROSOL. 0 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.