HazMat Tool — substance information

Chlorine pentafluoride

HMT May 2026
UN / ID
UN 2548
Hazard class
2.3
Packing group
ERG guide
ERG 124
Special provisions
SP 1, SP B7, SP B9, SP B14, SP N86
Source
49 CFR §172 (2026/05)

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Chlorine pentafluoride


Chlorine pentafluoride is an interhalogen compound with formula ClF5. This colourless gas is a strong oxidant that was once a candidate oxidizer for rockets. The molecule adopts a square pyramidal structure with C4v symmetry, as confirmed by its high-resolution 19F NMR spectrum. It was first synthesized in 1963. Wikipedia

Emergency Response Guide No. 124

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.3
Poisonous gas

(4) Identification number Help

UN 2548

(5) Packing Group Help

n/a

(6) Labels Help

Poisonous gas (2.3) Oxidizers (5.1) Corrosive liquids (8)

(7) Special Provisions (§172.102) Help

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.
1
B7
B9
B14
N86

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

(8A) ExceptionsNone
(8B) Non-bulk304see 49 CFR §173.304
(8C) Bulk314see 49 CFR §173.314

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft onlyForbidden

(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.