HazMat Tool — substance information

Trifluoroacetyl chloride

HMT 15 June 2026

UN / ID: UN 3057
Hazard class: 2.3
Packing group: —
ERG guide: ERG 125
Special provisions: SP 2, SP B7, SP B9, SP B14, SP T50, SP TP21
Source: 49 CFR §172 (15 June 2026)

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Trifluoroacetyl chloride

Trifluoroacetyl chloride (also known as TFAC) is a toxic gaseous chemical compound with the chemical formula C2ClF3O. TFAC is the perfluorinated version of acetyl chloride. The compound is a gas, but it is usually shipped as a liquid under high pressure Wikipedia

Emergency Response Guide No. 125

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.3
Poisonous gas

(4) Identification number

UN 3057

(5) Packing Group

n/a

(6) Labels

(7) Special Provisions (§172.102)

×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.

2	This material is poisonous by inhalation (see § 171.8 of this subchapter) in Hazard Zone B (see § 173.116(a) or § 173.133(a) of this subchapter), and must be described as an inhalation hazard under the provisions of this subchapter. Browse special provision 2
B7	Safety relief devices are not authorized on multi-unit tank car tanks. Openings for safety relief devices on multi-unit tank car tanks shall be plugged or blank flanged. Browse special provision B7
B9	Bottom outlets are not authorized. Browse special provision B9
B14	Each bulk packaging, except a tank car or a multi-unit-tank car tank, must be insulated with an insulating material so that the overall thermal conductance at 15.5 °C (60 °F) is no more than 1.5333 kilojoules per hour per square meter per degree Celsius (0.075 Btu per hour per square foot per degree Fahrenheit) temperature differential. Insulating materials must not promote corrosion to steel when wet. Browse special provision B14
T50	When portable tank instruction T50 is indicated in Column (7) of the § 172.101 Hazardous Materials Table, the applicable liquefied compressed gas and chemical under pressure descriptions are authorized to be transported in portable tanks in accordance with the requirements of § 173.313 of this subchapter. Browse special provision T50
TP21	The wall thickness must not be less than 8 mm. Portable tanks must be hydraulically tested and internally inspected at intervals not exceeding 2.5 years. Browse special provision TP21

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(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	Forbidden

(10) Vessel stowage

(10A) Location

Stowage category “D” means the material must be stowed “on deck only” on a cargo vessel or on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers or one passenger per each 3 m of overall vessel length, but the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

40	see 49 CFR §176.84

Source: 49 CFR §176.84

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.

Note: In this segregation and separation chart are HazMat of hazard class 2.3 considered depending on their poisonousness by inhalation (Hazard zone B). See special provision 2 and PHMSA Interpretation #09-0252.

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
1.1/1.2
1.3
1.4
1.5
1.6
2.1
2.2
2.3A
2.3B
3
4.1
4.2
4.3
5.1
5.2
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 2599	Chlorotrifluoromethane and trifluoromethane azeotropic mixture or Refrigerant gas R 503 with approximately 60 percent chlorotrifluoromethane	2.2
UN 1082	Trifluorochloroethylene, stabilized or Refrigerant gas R 1113	2.3
UN 2035	1,1,1-Trifluoroethane or Refrigerant gas, R 143a	2.1
UN 1983	1-Chloro-2,2,2-trifluoroethane or Refrigerant gas R 133a	2.2
UN 1742	Boron trifluoride acetic acid complex, liquid	8
UN 3419	Boron trifluoride acetic acid complex, solid	8
UN 1743	Boron trifluoride propionic acid complex, liquid	8
UN 3420	Boron trifluoride propionic acid complex, solid	8
UN 1009	Bromotrifluoromethane or Refrigerant gas, R 13B1.	2.2
UN 1022	Chlorotrifluoromethane or Refrigerant gas R 13	2.2
UN 1984	Trifluoromethane or Refrigerant gas R 23	2.2
UN 2604	Boron trifluoride diethyl etherate	8
UN 2965	Boron trifluoride dimethyl etherate	4.3
UN 2851	Boron trifluoride dihydrate	8
UN 3519	Boron trifluoride, adsorbed	2.3