# -4 Insulation.

**Citation:** 49 CFR 179.300-4  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Tanks shall not be insulated.

(b) [Reserved]

## Document text

(a) Tanks shall not be insulated.

(b) [Reserved]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.300-4>
- Source ID: `ecfr`
- SHA-256: `6490370b46d4d3d0418e2ce386a9d1bdca90a5cae44a57bce8f3a7c30a8f583d`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-22T06:37:59.374Z
- Document slug: `49-cfr-179-300-4`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.300-4",
  "subpart": "Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```