HazMat Tool — substance information
Cyclobutane
HMT 15 June 2026- UN / ID
- UN 2601
- Hazard class
- 2.1
- Packing group
- —
- 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 Pointn/a | Boiling Pointn/a |
| 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.***)
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| (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 |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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1.3 ![]() | ||||||||||||||||||
1.4 ![]() | ||||||||||||||||||
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1.6 ![]() | ||||||||||||||||||
2.1 ![]() | ||||||||||||||||||
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2.3A ![]() | ||||||||||||||||||
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3 ![]() | ||||||||||||||||||
4.1 ![]() | ||||||||||||||||||
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5.1 ![]() | ||||||||||||||||||
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6.1 ![]() | ||||||||||||||||||
7 ![]() | ||||||||||||||||||
8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
|---|---|---|
| UN 1976 | Octafluorocyclobutane, or Refrigerant gas RC 318 | 2.2 |
| RC 318, see Octafluorocyclobutane |