The Insulation Board,thermal, cataloged under National Stock Number 5640-00-237-4780, is classified within Federal Supply Class 5640 (Wallboard, Building Paper, and Thermal Insulation Materials) of the Construction and Building Materials 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2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5640-00-237-4780 |
| Item Name | Insulation Board,thermal |
| FSC / FSG | 5640 / 56 — Wallboard, Building Paper, and Thermal Insulation Materials |
| Status | ACTIVE |
| Supplementary Features | BLACK |
| Overall Thickness | 0.375 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| ENSOLITE TYPE LSC | 5/9 Secondary reference Royal Holdings, Inc. |
| MIL-P-15280 FMS | 5/1 Secondary reference U.S. Government activity |
| MIL-P-15280 | 4/1 Identification reference U.S. Government activity |
NSN 5640-00-237-4780 is a Insulation Board,thermal, classified under FSC 5640, Wallboard, Building Paper, and Thermal Insulation Materials. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5640-00-237-4781, 5640-00-237-4782, 5640-00-237-4786. Verify interchangeability with system specifications before substitution.
Key specifications for 5640-00-237-4780: Supplementary Features: BLACK; Overall Thickness: 0.375 INCHES NOMINAL IN; Overall Length: 48.000 INCHES NOMINAL IN; Overall Width: 36.000 INCHES NOMINAL IN. 2 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.