# Isobutylene (ID 1075)

**Citation:** ERG 2024 ID 1075  
**Type / status:** guidance / guidance  
**Agency:** U.S. DOT / Transport Canada / SICT  
**Effective:** Not stated  
**Published:** 2024-04-04

ERG2024 assigns Isobutylene (ID 1075) to Guide 115: Gases - Flammable (Including Refrigerated Liquids).

## Document text

ERG identification number: 1075.
Material: Isobutylene.
Assigned response guide: Guide 115, Gases - Flammable (Including Refrigerated Liquids).
The ERG index does not mark this entry with the P polymerization-hazard indicator.

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/erg/material?materialName=Isobutylene&materialUn=1075>
- Source ID: `phmsa-erg-2024`
- SHA-256: `536d57d85bfab2b419d214a5766afa1f78ae93ec0a79fc8f54beb59dcfc0850e`
- Retrieved: 2026-08-13T11:31:32.574Z
- Exported: 2026-08-26T23:09:32.397Z
- Document slug: `phmsa-erg-2024-material-id1075-isobutylene`

### 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": "1075",
  "materialName": "Isobutylene",
  "guideNumber": 115,
  "guideTitle": "Gases - Flammable (Including Refrigerated Liquids)",
  "polymerizationHazard": false,
  "physicalPage": 32,
  "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-04/ERG2024-Eng-Web-a.pdf#page=32"
}
```