# Acetaldehyde (ID 1089)

**Citation:** ERG 2024 ID 1089  
**Type / status:** guidance / guidance  
**Agency:** U.S. DOT / Transport Canada / SICT  
**Effective:** Not stated  
**Published:** 2024-04-04

ERG2024 assigns Acetaldehyde (ID 1089) to Guide 129: Flammable Liquids (Water-Miscible/Noxious).

## Document text

ERG identification number: 1089.
Material: Acetaldehyde.
Assigned response guide: Guide 129, Flammable Liquids (Water-Miscible/Noxious).
The ERG index marks this entry with P for a polymerization hazard under certain conditions.

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/erg/material?materialName=Acetaldehyde&materialUn=1089>
- Source ID: `phmsa-erg-2024`
- SHA-256: `e3f2f3d88353d74ecd2e49271c5a9319369270bc738a1490d2276814f915085a`
- Retrieved: 2026-08-13T11:31:32.574Z
- Exported: 2026-08-24T05:37:47.977Z
- Document slug: `phmsa-erg-2024-material-id1089-acetaldehyde`

### Source metadata

```json
{
  "edition": 2024,
  "language": "English",
  "jurisdiction": "US",
  "caveat": "Emergency-response guidance for the initial phase of a transportation incident. It is not controlling regulation, a compliance determination, a chemical-specific worker safety document, or a substitute for required shipping-paper emergency-response information.",
  "materialSubtype": "phmsa_erg_material",
  "recordKind": "material",
  "collectionId": "phmsa-erg-2024-overview",
  "parentDocumentId": "phmsa-erg-2024-overview",
  "sourceDateLabel": "Effective Date",
  "sourceDate": "2024-04-04",
  "idNumber": "1089",
  "materialName": "Acetaldehyde",
  "guideNumber": 129,
  "guideTitle": "Flammable Liquids (Water-Miscible/Noxious)",
  "polymerizationHazard": true,
  "physicalPage": 32,
  "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-04/ERG2024-Eng-Web-a.pdf#page=32"
}
```