HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Cyclobutane
HMT 15 June 2026- UN / ID
- UN 2601
- Hazard class
- 2.1
- Packing group
- — (multiple — see tabs)
- ERG guide
- ERG 115
- Special provisions
- —
- Source
- 49 CFR §172 (15 June 2026)
Cyclobutane
Cyclobutane is a cycloalkane and organic compound with the formula (CH2)4. Cyclobutane is a colourless gas and is commercially available as a liquefied gas. Derivatives of cyclobutane are called cyclobutanes. Cyclobutane itself is of no commercial or biological significance, but more complex derivatives are important in biology and biotechnology Wikipedia
Substance Data
Source: PubChemCAS-Number287-23-0 |
Flash Point— | Boiling Point— |
| Emergency Response Guide No. 115 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class2.1Flammable gases |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
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| — |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 306 | see 49 CFR §173.306 |
|---|---|---|
| (8B) Non-bulk | 304 | see 49 CFR §173.304 |
| (8C) Bulk | 314, 315 | see 49 CFR §173.314, 315 |
(9) Quantity Limits
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 150 kg |
(10) Vessel stowage
| (10A) Location | |
|---|---|
| (10B) Other |