HazMat Tool — substance information

Cyclobutane

HMT 15 June 2026
Reference only — HMT snapshot for inspection and audit support; not a shipping paper, placard mandate, or CVI record. Use Print / PDF below for field notes.
UN / ID
UN 2601
Hazard class
2.1
Packing group
ERG guide
ERG 115
Special provisions
Source
49 CFR §172 (15 June 2026)

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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: PubChem

CAS-Number

287-23-0

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 115

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.1
Flammable gases

(4) Identification number Help

UN 2601

(5) Packing Group Help

n/a

(6) Labels Help

Flammable gases (2.1) Cargo Aircraft Only (Cargo Aircraft Only)

(7) Special Provisions (§172.102) Help

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions306see 49 CFR §173.306
(8B) Non-bulk304see 49 CFR §173.304
(8C) Bulk314, 315see 49 CFR §173.314, 315

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft only150 kg

(10) Vessel stowage Help

(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.

Prohibited Must not be loaded, transported, or stored together in the same vehicle or facility.
Permitted May be loaded, transported, or stored together.
Restricted May be loaded, transported, or stored together only with restrictions.

Similar substances

UN / IDProper shipping nameHazard class
UN 1976Octafluorocyclobutane, or Refrigerant gas RC 3182.2
RC 318, see Octafluorocyclobutane